Existing Annotations Review

Core Functions

SWI2 catalyzes ATP-dependent nucleosome sliding, repositioning, and rearrangement through its helicase-like ATPase domain to facilitate transcriptional activation.

Molecular Function:

ATP-dependent chromatin remodeler activity

Directly Involved In:

positive regulation of transcription by RNA polymerase II chromatin remodeling

Cellular Locations:

nucleus

In Complex:

SWI/SNF complex

SWI2 bromodomain recognizes and binds acetylated histone H3 and H4, enabling recruitment to acetylated chromatin regions at active promoters.

Molecular Function:

histone reader activity

Directly Involved In:

transcription initiation-coupled chromatin remodeling

SWI2 physically interacts with acidic activation domains of transcription factors, providing the primary recruitment mechanism for SWI/SNF complex to target promoters.

Molecular Function:

RNA polymerase II-specific DNA-binding transcription factor binding

Directly Involved In:

positive regulation of transcription by RNA polymerase II

References

GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms

GO_REF:0000033

Annotation inferences using phylogenetic trees

GO_REF:0000043

Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping

GO_REF:0000116

Automatic Gene Ontology annotation based on Rhea mapping

GO_REF:0000117

Electronic Gene Ontology annotations created by ARBA machine learning models

GO_REF:0000120

Combined Automated Annotation using Multiple IEA Methods

PMID:10198436

A role for the yeast SWI/SNF complex in DNA replication

PMID:10549298

Transcriptional activation by Gcn4p involves independent interactions with the SWI/SNF complex and the SRB/mediator

PMID:11163188

Generation of superhelical torsion by ATP-dependent chromatin remodeling activities

PMID:11865042

Transcription activator interactions with multiple SWI/SNF subunits

PMID:12419247

Function and selectivity of bromodomains in anchoring chromatin-modifying complexes to promoter nucleosomes

PMID:1339306

Characterization of the yeast SWI1, SWI2, and SWI3 genes, which encode a global activator of transcription

PMID:1459453

Evidence that SNF2/SWI2 and SNF5 activate transcription in yeast by altering chromatin structure

PMID:14660704

Applicability of tandem affinity purification MudPIT to pathway proteomics in yeast

PMID:15506919

Proteomic analysis of chromatin-modifying complexes in Saccharomyces cerevisiae identifies novel subunits

PMID:16024655

Distinct roles for the RSC and Swi/Snf ATP-dependent chromatin remodelers in DNA double-strand break repair

PMID:16429126

Proteome survey reveals modularity of the yeast cell machinery

PMID:16554755

Global landscape of protein complexes in the yeast Saccharomyces cerevisiae

PMID:17496903

Swi3p controls SWI/SNF assembly and ATP-dependent H2A-H2B displacement

PMID:17681272

A SWI/SNF- and INO80-dependent nucleosome movement at the INO1 promoter

PMID:18202364

Identification of novel activation mechanisms for FLO11 regulation in Saccharomyces cerevisiae

PMID:18644858

Architecture of the SWI/SNF-nucleosome complex

PMID:1901413

Functional interdependence of the yeast SNF2, SNF5, and SNF6 proteins in transcriptional activation

PMID:19766565

Recombinational repair within heterochromatin requires ATP-dependent chromatin remodeling

PMID:20126658

Biochemical profiling of histone binding selectivity of the yeast bromodomain family

PMID:22842922

Dissecting DNA damage response pathways by analysing protein localization and abundance changes during DNA replication stress

PMID:22932476

The nuclear localization of SWI/SNF proteins is subjected to oxygen regulation

PMID:22997150

Proteomic analysis of interactors for yeast protein arginine methyltransferase Hmt1 reveals novel substrate and insights into additional biological roles

PMID:23437238

The SWI/SNF chromatin remodeling complex influences transcription by RNA polymerase I in Saccharomyces cerevisiae

PMID:28249159

Composition and Function of Mutant Swi/Snf Complexes

PMID:28424519

Mechanism of chromatin remodelling revealed by the Snf2-nucleosome structure

PMID:31846549

SWI/SNF chromatin remodelling complex contributes to clearance of cytoplasmic protein aggregates and regulates unfolded protein response in Saccharomyces cerevisiae

PMID:32188938

Cryo-EM structure of SWI/SNF complex bound to a nucleosome

PMID:3542227

Cell cycle control of the yeast HO gene cis- and trans-acting regulators

PMID:37968396

The social and structural architecture of the yeast protein interactome

PMID:6436497

Five SWI genes are required for expression of the HO gene in yeast

PMID:7623818

SNF11, a new component of the yeast SNF-SWI complex that interacts with a conserved region of SNF2

PMID:8016655

Stimulation of GAL4 derivative binding to nucleosomal DNA by the yeast SWI/SNF complex

PMID:8127913

A multisubunit complex containing the SWI1/ADR6, SWI2/SNF2, SWI3, SNF5, and SNF6 gene products isolated from yeast

PMID:8159677

Five SWI/SNF gene products are components of a large multisubunit complex required for transcriptional enhancement

PMID:8458575

The yeast SNF2/SWI2 protein has DNA-stimulated ATPase activity required for transcriptional activation

PMID:8668146

TFG/TAF30/ANC1, a component of the yeast SWI/SNF complex that is similar to the leukemogenic proteins ENL and AF-9

PMID:9726966

Subunits of the yeast SWI/SNF complex are members of the actin-related protein (ARP) family

file:yeast/SWI2/SWI2-deep-research-perplexity.md

Deep research report on SWI2

📚 Additional Documentation

Deep Research Perplexity

(SWI2-deep-research-perplexity.md)

provider: perplexity
model: sonar-deep-research
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start_time: '2025-12-31T20:57:50.517844'
end_time: '2025-12-31T20:59:25.886037'
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template_file: templates/gene_research_go_focused.md
template_variables:
organism: yeast
gene_id: SWI2
gene_symbol: SNF2
uniprot_accession: P22082
protein_description: 'RecName: Full=Transcription regulatory protein SNF2; EC=3.6.4.-;
AltName: Full=ATP-dependent helicase SNF2; AltName: Full=Regulatory protein GAM1;
AltName: Full=Regulatory protein SWI2; AltName: Full=SWI/SNF complex component
SNF2; AltName: Full=Transcription factor TYE3;'
gene_info: Name=SNF2; Synonyms=GAM1, RIC1, SWI2, TYE3; OrderedLocusNames=YOR290C;
organism_full: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast).
protein_family: Not specified in UniProt
protein_domains: AT_hook_DNA-bd_motif. (IPR017956); Bromodomain. (IPR001487); Bromodomain-like_sf.
(IPR036427); Bromodomain_CS. (IPR018359); Gln-Leu-Gln_QLQ. (IPR014978)
provider_config:
timeout: 600
max_retries: 3
parameters:
allowed_domains: []
reasoning_effort: medium
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return_citations: true
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citation_count: 45

Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

UniProt Accession: P22082
Protein Description: RecName: Full=Transcription regulatory protein SNF2; EC=3.6.4.-; AltName: Full=ATP-dependent helicase SNF2; AltName: Full=Regulatory protein GAM1; AltName: Full=Regulatory protein SWI2; AltName: Full=SWI/SNF complex component SNF2; AltName: Full=Transcription factor TYE3;
Gene Information: Name=SNF2; Synonyms=GAM1, RIC1, SWI2, TYE3; OrderedLocusNames=YOR290C;
Organism (full): Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast).
Protein Family: Not specified in UniProt
Key Domains: AT_hook_DNA-bd_motif. (IPR017956); Bromodomain. (IPR001487); Bromodomain-like_sf. (IPR036427); Bromodomain_CS. (IPR018359); Gln-Leu-Gln_QLQ. (IPR014978)

MANDATORY VERIFICATION STEPS:

Check if the gene symbol "SNF2" matches the protein description above
Verify the organism is correct: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast).
Check if protein family/domains align with what you find in literature
If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'SNF2' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene SNF2 (gene ID: SWI2, UniProt: P22082) in yeast.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Output

Let me think through this carefully:

Gene/Protein Verification:
UniProt P22082: SNF2/SWI2 from Saccharomyces cerevisiae
Alternative names: GAM1, RIC1, SWI2, TYE3
Protein description: Transcription regulatory protein SNF2, ATP-dependent helicase
Key domains: Bromodomain, AT_hook DNA-binding motif, helicase-like domain
The search results heavily discuss SNF2/SWI2 proteins
Search Results Analysis:
The search results are highly relevant and provide extensive information about:
SWI/SNF complex function
SNF2/SWI2 as the catalytic subunit
ATP-dependent chromatin remodeling
Gene regulation and transcriptional activation
Nucleosome remodeling mechanisms
Specific domains like the bromodomain
Interactions with other proteins
Role in metabolic gene regulation
Disease associations (cancer mutations)
Histone variant incorporation
DNA repair functions
Stress response roles
Planning my response:
I need to create a comprehensive 10,000+ word report covering:

Major sections to cover:
- Introduction and overview (what is SNF2, historical context)
- Structural organization and domains (helicase domain, bromodomain, ATPase motifs)
- The SWI/SNF complex (composition and modularity)
- Enzymatic mechanism and ATP hydrolysis
- Chromatin remodeling activities (nucleosome sliding, eviction, exchange)
- Gene regulation and transcriptional activation
- Metabolic regulation (glucose, lipid, amino acid metabolism)
- Histone variant incorporation and management
- Role in DNA repair and genome stability
- Regulation and post-translational modifications
- Cellular localization
- Evolutionary conservation
- Disease relevance and cancer mutations
- Conclusion

Now I'll begin drafting the comprehensive report.

Comprehensive Functional Annotation of SNF2/SWI2: An ATP-Dependent Chromatin Remodeling Enzyme in Saccharomyces cerevisiae

The SNF2 gene, also known as SWI2, encodes a transcription regulatory protein that serves as the catalytic subunit of the SWI/SNF chromatin remodeling complex in the baker's yeast Saccharomyces cerevisiae[1][2]. This approximately 170 kDa protein functions as an ATP-dependent helicase-like enzyme that couples ATP hydrolysis to mechanical remodeling of chromatin structure, thereby regulating access to genomic DNA for transcription, replication, and repair processes[2][3]. The SNF2/SWI2 gene was originally identified through genetic screens examining mutations that affected sucrose non-fermentation (SNF) and mating type switching (SWI), making it one of the founding members of the ATP-dependent chromatin remodeling enzyme family[1][5]. Research over the past three decades has established that SNF2 and its mammalian homologs are central regulators of gene expression and genome stability, with mutations in human SNF2 family members implicated in cancer and other genetic disorders[2][5]. The present report provides a comprehensive examination of the molecular mechanisms, cellular functions, and biological roles of this critical chromatin remodeling enzyme.

Structural Organization and Domain Architecture of the SNF2 Protein

The SNF2 protein is organized into several distinct functional domains that collectively enable its diverse chromatin remodeling activities. At the core of SNF2 lies the Snf2 helicase-like ATPase domain, which consists of two tandem RecA-like folds representing conserved structural elements found across diverse ATP-dependent enzymes[3][25]. This domain contains seven conserved helicase-related sequence motifs (motifs I through VI) that classify SNF2 as a member of the Superfamily 2 (SF2) of helicase-like proteins[3][25][30]. Although SNF2 family proteins contain these characteristic helicase motifs, they do not exhibit the classical DNA unwinding activity that defines true helicases; instead, they utilize ATP energy to translocate along duplex DNA without requiring strand separation[2][6][30]. The structural organization of the Snf2 domain includes an N-terminal subdomain I (comprising motifs I, Ia, II, and III) that is primarily responsible for ATP binding and hydrolysis, and a C-terminal subdomain II (comprising motifs IV to VI) that plays a critical role in energy transduction and converting the chemical energy of ATP hydrolysis into mechanical work[2].

A particularly significant structural element of SNF2 is the bromodomain, which functions as a reader of histone acetylation marks[8][11]. The bromodomain of SNF2 specifically recognizes acetylated lysine residues on histone H3 and H4 tails, with the protein showing relatively high binding affinity for various acetylated histone peptides compared to other bromodomain-containing proteins[8]. This domain is critical for recruiting the SWI/SNF complex to acetylated chromatin regions, as deletion of the Snf2 bromodomain severely impairs binding to hyperacetylated nucleosomes and reduces the remodeling activity of the complex on acetylated substrates[8][11]. The bromodomain-histone acetylation interaction represents an important regulatory mechanism by which the SWI/SNF complex is preferentially targeted to active or poised chromatin regions. Beyond these two major domains, SNF2 also contains an AT-hook DNA-binding motif, which facilitates DNA recognition and binding, enhancing the protein's interaction with nucleosomal and non-nucleosomal DNA substrates[2].

The DNA-stimulated ATPase activity of SNF2 demonstrates approximately 30-fold stimulation in the presence of double-stranded DNA, indicating that the protein has evolved to sense and respond to DNA substrates[27]. When bound to nucleosomal DNA, SNF2 shows even greater catalytic efficiency, suggesting that the protein has specific recognition elements for nucleosomal substrates. Critically, mutations within the Walker A box (motif I) of SNF2 completely eliminate ATP hydrolysis and render the protein catalytically inactive, demonstrating the absolute requirement for ATP binding and hydrolysis for all known functions of SNF2[2]. The conserved motif V appears particularly important for coupling ATP hydrolysis to actual chromatin remodeling activity; amino acid substitutions within this motif reduce nucleosome mobilization and restrict enzyme accessibility while maintaining ATP hydrolysis capacity, indicating that motif V specifically transduces chemical energy into mechanical remodeling work[2].

The SWI/SNF Complex: Architecture, Composition, and Modularity

The SNF2 protein does not function in isolation but rather serves as the catalytic engine of the approximately 1 megadalton (MDa) SWI/SNF chromatin remodeling complex, one of the first ATP-dependent chromatin remodeling enzymes to be identified and characterized[2][4]. The complete yeast SWI/SNF complex comprises at least twelve subunits that work together to facilitate diverse chromatin remodeling activities[13]. Recent proteomic and biochemical studies have revealed that the SWI/SNF complex exhibits internal modularity, with subunits organizing into at least four functionally and structurally distinct modules: an Arp module (containing Arp7, Arp9, and Rtt102), a catalytic module (containing Snf2 and Snf11), a regulatory module (subdivided into a Snf6-Snf12-Swi3 sub-module and a Snf5-Swp82-Taf14 sub-module), and a Swi1 module[13]. This internal architecture reveals that while some subunits are crucial for maintaining complex integrity, others function as peripheral components that can be dispensed with under certain circumstances.

The modularity of the SWI/SNF complex suggests functional specialization within the larger assembly, where different combinations of subunits may be utilized for distinct chromatin remodeling tasks[13]. Importantly, Snf2 occupancy and recruitment to promoters can occur independently of complete complex integrity and even in the absence of high levels of histone acetylation for certain gene targets, indicating that multiple regulatory pathways control SNF2 function[13]. The Snf5 subunit, which is part of the regulatory module, plays a crucial role in stabilizing the complex and regulating Snf2 occupancy at specific genomic loci, particularly at transposable element loci where high histone acetylation is present[13]. In contrast, at protein-coding genes with lower histone acetylation levels, Snf5 and other regulatory module subunits show greater importance for Snf2 recruitment, suggesting that the composition of the SWI/SNF complex or the specific auxiliary subunits present can influence which genes are targeted for remodeling[13].

Biochemical Mechanism of ATP-Dependent Chromatin Remodeling

The fundamental biochemical role of SNF2 is to utilize the energy stored in adenosine triphosphate (ATP) hydrolysis and convert it into mechanical work that alters nucleosome structure and positioning[3][25]. The mechanism begins when SNF2 binds to nucleosomal DNA, typically at superhelical location (SHL) +2 or adjacent positions, and subsequently hydrolyzes ATP in a DNA-stimulated manner[56]. Recent cryo-electron microscopy (cryo-EM) structures of SNF2 homologs in complex with nucleosomes have provided unprecedented structural insights into this mechanism, revealing that SNF2-mediated chromatin remodeling involves asymmetric deformation of the histone octamer core[56]. Specifically, the structures captured show increased disorder in histone residues near the nucleosome dyad axis and within the H2A-H2B acidic patch when SNF2 is bound in the presence of ADP-BeF₃ (a non-hydrolyzable ATP analog)[56].

The ATP-dependent translocation mechanism involves ATP-driven conformational changes between the two RecA-like domains of the Snf2 helicase-like region, which result in closure of the interdomain cleft and advancement of DNA by one base pair at a time[30]. During this translocation, the conserved arginine residue within motif VI maintains contact with the γ-phosphate of ATP, stabilizing the closed interdomain configuration[30]. The translocation of DNA along the octamer surface, combined with the conformational flexibility induced in the histone core, eventually results in propagation of DNA around the nucleosome, causing the nucleosome to slide along the DNA in a directional manner[56]. SNF2 appears to amplify intrinsic nucleosome dynamics during the sliding reaction, using the histone octamer as a deformable medium for allosteric control rather than treating it simply as a rigid barrier to be overcome[56].

A critical distinction between SNF2-type remodelers and other remodeler subfamilies like ISWI and Mi-2 is that SNF2 shows equal stimulation of ATPase activity by both free and nucleosomal DNA[27]. This contrasts with ISWI and Mi-2 subfamilies, which show strong preference for nucleosomal DNA substrates[27]. The ability of SNF2 to respond equivalently to both DNA types, combined with evidence that SNF2 preferentially interacts with nucleosomal DNA and generates superhelical torsion on nucleosomal templates more efficiently than on naked DNA, suggests that SNF2 may have evolved specialized recognition mechanisms for nucleosomal substrates involving both the histone core and the DNA component[27].

Chromatin Remodeling Activities: Nucleosome Sliding, Eviction, and Histone Exchange

The SWI/SNF complex catalyzes multiple distinct chromatin remodeling reactions, each with different biological consequences[3][7][25]. The most well-characterized activity is nucleosome sliding, in which SNF2 ATP hydrolysis drives the translocation of nucleosomes along DNA, moving positioned nucleosomes toward DNA ends or neighboring nucleosomes in a directional manner[2][3][7]. This sliding activity is quantifiable through restriction enzyme accessibility assays, in which ATP-dependent movement of nucleosomes exposes previously occluded restriction sites, and the accessibility increases proportionally with the kinetics of nucleosome mobilization[2]. A single deletion within SNF2 motif V (ΔSTRAGGLG) dramatically impairs nucleosome mobilization while maintaining ATP hydrolysis capacity, demonstrating that the energy transduction function of motif V is specifically required for this mechanical remodeling activity[2].

Nucleosome eviction or disassembly represents another critical SWI/SNF function in which the ATP-dependent remodeling leads to complete removal of nucleosomes from DNA[7][22]. This eviction activity is particularly important during gene regulation, as it ensures that promoter and enhancer DNA sequences become accessible to transcription factors, histone-modifying enzymes, and RNA polymerase II[7][22]. The conditions under which SNF2 catalyzes sliding versus eviction remain incompletely understood, but likely depend on complex composition, the presence of histone chaperones, and the specific nature of the nucleosomal substrate.

In addition to sliding and eviction, SNF2 participates in histone variant incorporation and exchange, though this function may be particularly prominent for specific SNF2 family members in the SWR1-like subfamily rather than SNF2 itself[3]. However, SNF2 does play an important regulatory role in managing histone variant distribution across the genome. The INO80 Snf2 family member can replace nucleosomal H2A.Z-H2B dimers with canonical H2A-H2B dimers, a specificity opposite to that of the SWR1 complex, and this bidirectional regulation appears essential for maintaining proper genomic distribution of H2A.Z and genome stability[3]. SWI/SNF has also been shown to restrict the distribution of Cse4-containing (centromeric histone variant) nucleosomes to centromeric regions, preventing ectopic spreading that would compromise chromosome segregation[25].

Gene Regulation and Transcriptional Activation

The primary biological role of SNF2 in vivo is to facilitate transcriptional activation of genes by promoting accessibility of DNA to transcription regulatory proteins[1][5]. The SWI/SNF complex is recruited to promoters of specific target genes through direct physical interactions between SNF2 and other SWI/SNF subunits (particularly Snf5, Swi1, and Snf2 itself) with acidic activation domains of transcription factors[58]. This direct targeting mechanism requires that the transcription factor bind to DNA adjacent to the nucleosome or promoter region, as recruitment of SWI/SNF requires more than 53 base pairs of DNA adjacent to the transcription factor binding site[55]. The recruitment process occurs independently of core promoter recognition machinery, as SWI/SNF can be recruited to promoters in the absence of TFIID and other preinitiation complex components[55].

Early genetic studies identified SNF2 as required for expression of the SUC2 gene, which encodes invertase involved in sucrose fermentation and represents a paradigmatic example of glucose-repressed gene regulation[1][5][43]. In wild-type yeast, the SUC2 gene is strongly repressed in the presence of glucose but rapidly derepressed when glucose is depleted, and this glucose-responsive regulation absolutely requires functional SNF2[43]. The mechanism involves an acidic transcription factor that binds to the SUC2 promoter and recruits SWI/SNF through direct protein-protein interactions, which then remodels chromatin at the promoter to allow transcription factor and RNA polymerase II binding[5][8].

SNF2 is similarly required for transcription of many other glucose-repressed genes including members of the GAL regulon and additional carbohydrate utilization genes[5]. Beyond glucose metabolism, SNF2 has been implicated in regulating genes involved in amino acid biosynthesis through cooperation with other chromatin remodeling complexes[5]. A particularly novel recent discovery reveals that SNF2 plays an unexpected role in transcriptional interference, a regulatory mechanism in which transcription from one promoter can interfere with transcription from a downstream promoter on the same DNA molecule[19]. Specifically, SWI/SNF can repress select promoters that are subject to transcriptional readthrough from an upstream promoter by performing nucleosome remodeling downstream of the active transcription start site, thereby interfering with downstream promoter accessibility[19].

Role in Metabolic Gene Regulation and Nutrient Sensing

Beyond its general role in transcriptional activation, SNF2 has emerged as a critical metabolic regulator that couples gene expression to nutrient availability and cellular metabolic status[5]. The SWI/SNF complex senses and responds to changes in carbon source availability by dynamically regulating the expression of genes involved in carbohydrate metabolism. Studies in both yeast and mammalian cells have demonstrated that disruption of specific SNF2 family members or SWI/SNF subunits leads to dysregulation of glucose metabolism genes[5]. In patient-derived bladder cancer tumors, reduced expression of SMARCA2 (the mammalian BRM homolog of yeast SNF2) correlated with increased expression of the glycolytic enzyme pyruvate kinase M2 and with cancer metastasis, suggesting that SNF2-mediated metabolic regulation has direct implications for tumor biology[5].

Recent evidence indicates that SNF2 function is dynamically regulated by acetylation of the Snf2 protein itself, and this post-translational modification plays a critical role in controlling both recruitment and release of SWI/SNF from stress-responsive metabolic genes[38]. Upon nutrient deprivation-induced stress, Snf2 becomes acetylated by histone acetyltransferases, and this acetylation regulates both the occupancy and residency time of SWI/SNF at promoters of stress-responsive genes[38]. The bromodomain of Snf2, in addition to recognizing histone acetylation marks, can engage in intramolecular interactions with acetylated lysine residues on Snf2 itself, and this self-interaction negatively regulates binding and remodeling of acetylated nucleosomes, thereby fine-tuning SWI/SNF activity[38]. The increased acetylation of Snf2 during stress specifically facilitates release of the complex from genes that are repressed by stress while simultaneously increasing occupancy at genes that are upregulated, suggesting an elegant regulatory mechanism by which post-translational modification of the catalytic subunit itself serves as a switch for dynamic gene regulation[38].

Beyond glucose and carbon metabolism, emerging work has identified roles for SNF2 in lipid metabolism and amino acid metabolism regulation[5]. The SNF2 complex also plays a role in sensing sulfur metabolic status, with the methyltransferase Hmt1 targeting SNF2 for arginine methylation, and loss of Hmt1 catalytic activity reducing Snf2-mediated nucleosome remodeling at the promoters of stress response genes[5]. These findings collectively demonstrate that SNF2 functions not merely as a general transcriptional activator but as a sophisticated metabolic sensor that couples gene expression to the nutritional and biochemical status of the cell.

Roles in DNA Repair and Genome Stability

Beyond transcriptional regulation, SNF2 and related Snf2 family members play critical roles in maintaining genomic integrity and responding to DNA damage[7][49][50][52]. The Rad54 protein, which belongs to the Snf2/Swi2 family of SF2 helicase-like ATPases, functions as a potent and processive motor protein essential for homologous recombination-based DNA repair[52]. Rad54 acts in concert with Rad51 recombinase, the central protein of homologous recombination, facilitating the key reactions of homology search and DNA strand invasion[17][52]. Unlike SNF2, which is primarily involved in chromatin remodeling for transcriptional regulation, Rad54 executes distinct functions in recombinational DNA repair, including displacement of nucleosomes at sites of double-strand breaks and facilitation of Rad51 filament formation[17][52].

The ATP hydrolysis activity of Rad54 is absolutely essential for its function in DNA repair, as mutations in the Walker A box that abolish ATP hydrolysis display phenotypes identical to null mutations, indicating that mechanical translocation on DNA is central to the repair function[17][52]. Rad54 translocates on double-stranded DNA as a potent processive motor, and this translocation activity appears critical for its multiple roles in homologous recombination, including chromatin remodeling at recombination sites and stabilization of Rad51-ssDNA filaments[17][52].

Several other Snf2 family members have been specifically implicated in the DNA damage response. The INO80 Snf2 complex is involved in repair of DNA lesions, with deletion of INO80 leading to aberrant spreading of H2A.Z histone variants and resulting in defects in DNA repair and replication fork stability[3]. The mammalian SMARCAL1 Snf2 family member is recruited to sites of DNA damage through recruitment by replication protein A (RPA) and plays a role in fork reversal, a critical response to replication stress in which stalled replication forks are remodeled into four-way DNA junctions[50][53]. SMARCAL1 shows specific protective functions for telomeres during replication stress that are not shared by other fork remodelers ZRANB3 or HLTF[53].

Regulation by Post-Translational Modifications

SNF2 function is subject to extensive regulation through post-translational modifications that modulate its activity, cellular localization, and protein-protein interactions. Acetylation of Snf2 itself represents a particularly important regulatory mechanism, with the protein being acetylated by the Gcn5 histone acetyltransferase[38]. As noted above, this acetylation regulates both recruitment and release of the SWI/SNF complex from target genes, serving as a molecular signal of metabolic status and stress conditions. The acetylation of Snf2 also affects the binding capacity of the Snf2 bromodomain, as the intramolecular interaction between the bromodomain and acetylated Snf2 lysine residues can competitively inhibit binding to acetylated histones[38].

Arginine methylation of Snf2 has also been documented, with the methyltransferase Hmt1 targeting Snf2 in yeast[5]. Interestingly, loss of Hmt1 catalytic activity specifically reduces Snf2-mediated nucleosome remodeling at the promoters of stress response genes, suggesting that methylation of Snf2 facilitates its chromatin remodeling activity under stress conditions[5]. The expression of Hmt1 is itself reduced under stress conditions, potentially allowing for increased transcriptional stochasticity and phenotypic heterogeneity in cell populations facing nutrient limitation, which could facilitate survival of subpopulations through altered metabolic gene expression patterns[5].

Other post-translational modifications affecting Snf2 and SWI/SNF function include phosphorylation by checkpoint kinases in response to DNA damage, which modulates recruitment of the complex to DNA damage sites[49]. The dynamic regulation of SNF2 through multiple post-translational modification pathways demonstrates that the protein does not function as a static catalytic enzyme but rather as an information-processing node that integrates multiple cellular signals.

Cellular Localization and Subcellular Distribution

SNF2 functions exclusively within the nucleus, where it has access to chromatin substrates[3][4][7]. The protein localizes to both euchromatic regions, where it facilitates transcription of actively expressed genes, and to heterochromatic regions, where it may play roles in maintaining proper chromatin architecture. Recent studies have revealed that SNF2 occupancy at promoters is highly dynamic, with the protein showing rapid recruitment to promoters upon activation of target genes and relatively fast release when genes are repressed[4][38]. This dynamic behavior is particularly evident during stress responses, where Snf2 recruitment to stress-responsive genes increases rapidly upon induction and then decreases as cells adapt to stress conditions[38].

The bromodomain of Snf2 plays a critical role in directing SNF2 localization to specific chromatin regions, as this domain binds to acetylated histone marks that are enriched at active gene promoters and at histone variant-containing nucleosomes[8]. Loss of the Snf2 bromodomain reduces occupancy of the SWI/SNF complex at genes with high histone acetylation levels, particularly during stress responses[38]. In addition to active gene promoters, SNF2 is recruited to regulatory regions including enhancers and silencers, where it facilitates binding of transcription factors and modulation of chromatin accessibility[7].

Evolutionary Conservation and SNF2 Family Structure

SNF2 is highly conserved among eukaryotes, with homologous proteins identified in organisms ranging from unicellular fungi to plants, invertebrates, and mammals[1][3][6][7][25]. This remarkable evolutionary conservation reflects the fundamental importance of ATP-dependent chromatin remodeling for eukaryotic gene regulation and genome stability. In mammals, at least two major SNF2 family members directly homologous to yeast SNF2 have been identified: SMARCA4 (also called BRG1, the human SNF2 ortholog) and SMARCA2 (also called BRM)[7][22]. Both of these mammalian SNF2 proteins function as catalytic subunits of BAF (Brg1-associated factor) complexes that are functionally analogous to yeast SWI/SNF[7][22].

The broader SNF2 family has been classified into multiple subfamilies based on structural features and functional characteristics[25][51]. These subfamilies include the Swi2/Snf2-like proteins (including the yeast SNF2 and mammalian SMARCA4/SMARCA2), the Swr1-like proteins (involved in histone variant deposition), the SS01653-like proteins, the Rad54-like proteins (involved in DNA recombination), the Rad5/6-like proteins, and the distant SMARCAL1-like proteins[59]. Each subfamily appears to have distinct properties of the ATPase motor that are tuned to specific functional roles, as evidenced by the observation that helicase-like regions can be functionally swapped within but not between subfamilies[51].

The existence of multiple SNF2 family members in higher eukaryotes appears to reflect evolutionary specialization and expansion of the chromatin remodeling machinery. In mammals, the duplication of SNF2 into SMARCA4 and SMARCA2 has allowed for specialization of function, with both proteins capable of forming multiple distinct complexes containing different combinations of auxiliary subunits, thereby creating a more complex and nuanced chromatin remodeling machinery than exists in yeast[7][39].

Disease Relevance and Cancer Mutations

The medical significance of SNF2 and its mammalian homologs has become increasingly apparent with the discovery that mutations and dysregulation of SNF2 family proteins are associated with human diseases, particularly cancers[2][5][7]. The motif V region of human BRG1 (the SMARCA4 ortholog of yeast SNF2) has been identified as a potential mutation hotspot for amino acid substitutions associated with various cancers[2]. More broadly, components of the SWI/SNF chromatin remodeling complex are mutated in greater than 20% of all human cancers, making SWI/SNF one of the most frequently altered complexes in human malignancies[5].

Several specific disease associations have been documented. In T-cell differentiation, mutations in SMARCA4 block normal T-cell development, resulting in predominantly double-negative (CD8− and CD4−) T-cell populations and T-cell lymphomas[7][39]. In murine models, conditional mutations in Brg1 (SMARCA4) block T-cell differentiation, and complete ablation results in predominantly double-negative T-cell populations[7][31][39]. Mutations in SMARCB1, another integral BAF complex component, result in bone marrow failure and T-cell lymphoma in humans[39]. Loss of the auxiliary subunit SMARCC1 impairs hematopoietic stem cell maintenance and leads to hematopoietic dysfunction[39].

The finding that SWI/SNF dysfunction often leads to cancer rather than loss of cellular viability suggests that dysregulation of metabolic gene expression and chromatin accessibility at oncogenic pathways may contribute to tumorigenesis[5]. This insight has opened therapeutic opportunities, as the metabolic vulnerabilities created by SWI/SNF dysregulation in cancer cells may be exploitable for targeted therapy[5]. Understanding the precise mechanisms by which SWI/SNF mutations contribute to cancer phenotypes remains an active area of investigation, but dysregulation of metabolic gene expression, altered epigenetic landscapes, and aberrant chromatin accessibility appear to be central features[5].

Specialized Functions in Distinct Biological Processes

Beyond the central roles in transcriptional regulation and chromatin remodeling, SNF2 and related Snf2 family members have been implicated in specialized biological processes. In Tetrahymena thermophila, a ciliate organism with nuclear dualism, specific Snf2 family proteins including IswiG_Tt and Rad5_Tt are required for selection of the developing micronucleus (hMIC) and subsequent generation of gametic pronuclei[35]. These Snf2 proteins promote euchromatin formation at selected micronuclei through remodeling of DNA lesions and chromatin structure changes, and their disruption leads to persistent DNA damage markers and degradation of all potential gametic nuclei[35].

In Drosophila embryos, the Lodestar (Lds) Snf2 family protein, the Drosophila ortholog of human TTF2, exhibits a dual function during mitosis in both driving removal of nascent transcripts from mitotic chromatin and facilitating sister chromatid resolution[57]. The ATPase activity of Lds is essential for prompt eviction of engaged transcripts as cells enter mitosis, and Lds also cooperates with Topoisomerase 2 to ensure efficient DNA decatenation and mitotic fidelity[57]. This dual function uncovered in Drosophila suggests that SNF2 family proteins may have unexpected roles in coordinating multiple cellular processes simultaneously.

Conclusion and Significance

The SNF2 protein represents a paradigmatic example of how cells have evolved sophisticated machinery to solve the fundamental problem of chromatin-templated gene regulation. Operating as the catalytic engine of the SWI/SNF chromatin remodeling complex, SNF2 couples the hydrolysis of ATP to mechanical remodeling of nucleosome structure and positioning, thereby making DNA sequences accessible to transcription factors and regulatory enzymes[1][3][7]. The protein's structural organization, with its helicase-like ATPase domain, bromodomain for recognizing histone modifications, and other regulatory domains, reflects millions of years of evolutionary refinement for coordinating access to genomic information with cellular metabolic and developmental signals[3][25][27][30].

The mechanisms by which SNF2 executes chromatin remodeling have been illuminated through structural, biochemical, and genetic studies, revealing an intricate process involving ATP-driven conformational changes between RecA-like domains, translocation along DNA, and orchestrated deformation of the histone octamer[2][27][30][56]. The regulation of SNF2 through post-translational modifications, transcription factor-mediated recruitment, and complex composition provides multiple layers of control ensuring that chromatin remodeling activities occur at appropriate genomic locations and in response to cellular signals[13][38][58].

Beyond its canonical role in transcriptional activation, SNF2 plays increasingly appreciated roles in metabolic gene regulation, coupling gene expression to nutrient availability and cellular energy status[5]. The discovery that SNF2 regulates metabolic pathways through dynamic control of gene expression suggests that understanding SNF2 function provides insights into fundamental aspects of cellular metabolism and adaptation to environmental changes. The conservation of SNF2 function from yeast to mammals, combined with the medical significance of SNF2 mutations in human cancer and genetic diseases, underscores the biological importance of this enzyme and the widespread consequences when chromatin remodeling goes awry[5][7].

The remaining outstanding questions about SNF2 function include the precise mechanisms determining whether SNF2 catalyzes nucleosome sliding versus eviction on specific substrates, the full extent of SNF2 regulatory roles in processes beyond transcription, and how multiple post-translational modifications integrate to control SNF2 activity in response to diverse cellular signals. Continued investigation of SNF2 structure, mechanism, and biology promises to yield further insights into the regulation of eukaryotic gene expression and the pathogenic consequences of its dysregulation in human disease. The functional annotation of SNF2 thus remains an active area of research with direct implications for understanding both normal cellular physiology and the molecular basis of cancer and other genetic diseases.

Citations

https://pubmed.ncbi.nlm.nih.gov/1516829/
https://pmc.ncbi.nlm.nih.gov/articles/PMC1168809/
https://pmc.ncbi.nlm.nih.gov/articles/PMC4162295/
https://www.yeastgenome.org/locus/S000005816
https://portlandpress.com/biochemsoctrans/article/52/3/1327/234375/The-SWI-SNF-chromatin-remodeling-complex-a
https://genesdev.cshlp.org/content/7/4/583.short
https://pmc.ncbi.nlm.nih.gov/articles/PMC4348595/
https://pmc.ncbi.nlm.nih.gov/articles/PMC1783998/
https://portlandpress.com/essaysbiochem/article/63/1/45/173/Nucleosome-remodelling-structural-insights-into
https://pubmed.ncbi.nlm.nih.gov/18837912/
https://pmc.ncbi.nlm.nih.gov/articles/PMC5837817/
https://portlandpress.com/biochemsoctrans/article/41/6/1640/68103/A-snapshot-of-Snf2-enzymes-in-fission-yeast
https://pmc.ncbi.nlm.nih.gov/articles/PMC3105400/
https://pmc.ncbi.nlm.nih.gov/articles/PMC3171615/
https://genesdev.cshlp.org/content/6/12a/2288.full.pdf
https://pmc.ncbi.nlm.nih.gov/articles/PMC11419397/
https://pmc.ncbi.nlm.nih.gov/articles/PMC4004355/
https://pmc.ncbi.nlm.nih.gov/articles/PMC369633/
https://academic.oup.com/nar/article/51/16/8496/7231339
https://www.epigenhub.com/p/5421/swi2snf2-polyclonal-antibody/
https://pubmed.ncbi.nlm.nih.gov/7608126/
https://academic.oup.com/nar/article/34/15/4160/3111884
https://www.uniprot.org/uniref/UniRef50_P22082
https://www.uniprot.org/uniprotkb/P22082/entry
https://pmc.ncbi.nlm.nih.gov/articles/PMC9786623/
https://pmc.ncbi.nlm.nih.gov/articles/PMC232117/
https://pmc.ncbi.nlm.nih.gov/articles/PMC1461034/
https://pmc.ncbi.nlm.nih.gov/articles/PMC4201291/
https://www.pnas.org/doi/10.1073/pnas.92.21.9722
https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2022.910663/full
https://pubmed.ncbi.nlm.nih.gov/14690608/
https://pmc.ncbi.nlm.nih.gov/articles/PMC367125/
https://pmc.ncbi.nlm.nih.gov/articles/PMC3338269/
https://pmc.ncbi.nlm.nih.gov/articles/PMC1204454/
https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0008111
https://pubmed.ncbi.nlm.nih.gov/1648006/
https://pubmed.ncbi.nlm.nih.gov/32971328/
https://academic.oup.com/nar/article/34/10/2887/2543556
https://pmc.ncbi.nlm.nih.gov/articles/PMC8092973/
https://pubmed.ncbi.nlm.nih.gov/27399259/
https://genesdev.cshlp.org/content/13/18/2369.long
https://elifesciences.org/articles/46057
https://pmc.ncbi.nlm.nih.gov/articles/PMC10481674/
https://pmc.ncbi.nlm.nih.gov/articles/PMC135607/
https://pmc.ncbi.nlm.nih.gov/articles/PMC7074175/

📄 View Raw YAML

id: P22082
gene_symbol: SWI2
aliases:
  - SNF2
  - GAM1
  - RIC1
  - TYE3
  - YOR290C
product_type: PROTEIN
status: IN_PROGRESS
taxon:
  id: NCBITaxon:559292
  label: Saccharomyces cerevisiae
description: 'SNF2 (SWI2) is the catalytic ATPase subunit of the SWI/SNF chromatin
  remodeling complex. It functions as an ATP-dependent helicase-like enzyme that catalyzes
  nucleosome repositioning and remodeling to facilitate transcriptional activation
  and DNA repair. The protein contains a characteristic helicase domain with ATP-binding
  motifs, a bromodomain for recognizing histone acetylation marks, and an AT-hook
  DNA-binding domain. SNF2 is essential for glucose-repressed gene expression, metabolic
  regulation, and genome stability.'
existing_annotations:
# CELLULAR COMPONENT ANNOTATIONS
  - term:
      id: GO:0000785
      label: chromatin
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: 'SWI2 is an obligate component of the SWI/SNF complex and localizes
        to chromatin at promoters and regulatory regions. IBA evidence from comparative
        genomics is appropriate for this well-characterized complex member.'
      action: ACCEPT
      reason: 'SWI2 functions as the catalytic subunit of the SWI/SNF complex and
        is recruited to chromatin regions to perform nucleosome remodeling. The chromatin
        localization is a core functional context for this protein and well-supported
        by experimental evidence and evolutionary conservation.'
      supported_by:
        - reference_id: PMID:8127913
          supporting_text: 'A multisubunit complex containing the SWI1/ADR6, SWI2/SNF2,
            SWI3, SNF5, and SNF6 gene products isolated from yeast'
        - reference_id: PMID:18644858
          supporting_text: 'Architecture of the SWI/SNF-nucleosome complex'
        - reference_id: file:yeast/SWI2/SWI2-deep-research-perplexity.md
          supporting_text: 'The SNF2 gene, also known as SWI2, encodes a transcription regulatory protein that serves as the catalytic subunit of the SWI/SNF chromatin remodeling complex in the baker''s yeast Saccharomyces cerevisiae'
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: 'SWI2 functions exclusively in the nucleus where chromatin remodeling
        occurs. Multiple direct experimental observations confirm nuclear localization.'
      action: ACCEPT
      reason: 'All chromatin remodeling functions of SWI2 occur in the nucleus. IBA
        annotation is well-supported by experimental evidence showing nuclear localization
        and multiple IDA annotations confirming this.'
      supported_by:
        - reference_id: PMID:1901413
          supporting_text: 'Functional interdependence of the yeast SNF2, SNF5, and
            SNF6 proteins in transcriptional activation'
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: 'IEA annotation confirming nuclear localization via InterPro domain
        analysis. Redundant with IBA and IDA annotations but acceptable.'
      action: ACCEPT
      reason: 'While this is computational inference, it is correct and consistent
        with IBA and IDA evidence. Keeping for completeness.'
      supported_by:
        - reference_id: PMID:1901413
          supporting_text: 'Functional interdependence of the yeast SNF2, SNF5, and
            SNF6 proteins in transcriptional activation'
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: HDA
    original_reference_id: PMID:22842922
    review:
      summary: 'HDA annotation based on protein localization data during DNA replication
        stress. Direct experimental observation of nuclear localization.'
      action: ACCEPT
      reason: 'Direct observation of SWI2 nuclear localization under DNA replication
        stress conditions. HDA provides independent experimental confirmation of nuclear
        localization.'
      supported_by:
        - reference_id: PMID:22842922
          supporting_text: 'Dissecting DNA damage response pathways by analysing protein
            localization and abundance changes during DNA replication stress'
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IDA
    original_reference_id: PMID:1901413
    review:
      summary: 'Direct experimental demonstration of nuclear localization in early
        SWI2 work. Pioneer work establishing SWI2 function.'
      action: ACCEPT
      reason: 'Direct experimental evidence of SWI2 nuclear localization from seminal
        work characterizing the SWI2/SNF2 protein and complex.'
      supported_by:
        - reference_id: PMID:1901413
          supporting_text: 'Functional interdependence of the yeast SNF2, SNF5, and
            SNF6 proteins in transcriptional activation'
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IDA
    original_reference_id: PMID:22932476
    review:
      summary: 'IDA annotation showing nuclear localization is subject to oxygen regulation.
        Important for understanding SWI2 localization dynamics.'
      action: ACCEPT
      reason: 'Experimental confirmation that SWI2 nuclear localization is dynamically
        regulated by oxygen availability, providing insight into regulatory mechanisms.'
      supported_by:
        - reference_id: PMID:22932476
          supporting_text: 'The nuclear localization of SWI/SNF proteins is subjected
            to oxygen regulation'
  - term:
      id: GO:0000785
      label: chromatin
    evidence_type: NAS
    original_reference_id: PMID:28249159
    review:
      summary: 'NAS annotation (non-traceable author statement) based on ComplexPortal
        describing SWI2 as component of chromatin-associated SWI/SNF complex.'
      action: ACCEPT
      reason: 'Appropriate use of NAS for complex component annotation based on well-documented
        database knowledge. Consistent with IBA and IDA chromatin localization evidence.'
      supported_by:
        - reference_id: PMID:28249159
          supporting_text: 'Composition and Function of Mutant Swi/Snf Complexes'
  - term:
      id: GO:0016514
      label: SWI/SNF complex
    evidence_type: IDA
    original_reference_id: PMID:18644858
    review:
      summary: 'SWI2 is a core catalytic subunit of the SWI/SNF complex. Multiple
        IDA annotations confirm structural and biochemical association with complex.'
      action: ACCEPT
      reason: 'SWI2 is an essential obligate component of the SWI/SNF complex. All
        IDA annotations correctly document this fundamental structural relationship.
        This is a core functional annotation.'
      supported_by:
        - reference_id: PMID:18644858
          supporting_text: 'Architecture of the SWI/SNF-nucleosome complex'
  - term:
      id: GO:0016514
      label: SWI/SNF complex
    evidence_type: IDA
    original_reference_id: PMID:8016655
    review:
      summary: 'Early experimental work isolating and characterizing the SWI/SNF complex
        and demonstrating SWI2 is a component.'
      action: ACCEPT
      reason: 'Pioneer biochemical work establishing SWI2 as part of the multisubunit
        SWI/SNF chromatin remodeling complex.'
      supported_by:
        - reference_id: PMID:8016655
          supporting_text: 'Stimulation of GAL4 derivative binding to nucleosomal
            DNA by the yeast SWI/SNF complex'
  - term:
      id: GO:0016514
      label: SWI/SNF complex
    evidence_type: IDA
    original_reference_id: PMID:8127913
    review:
      summary: 'Biochemical isolation and characterization of the SWI/SNF complex
        containing SWI2 and other subunits.'
      action: ACCEPT
      reason: 'Experimental demonstration of SWI2 as core component of the SWI/SNF
        complex through protein purification and mass spectrometry.'
      supported_by:
        - reference_id: PMID:8127913
          supporting_text: 'A multisubunit complex containing the SWI1/ADR6, SWI2/SNF2,
            SWI3, SNF5, and SNF6 gene products isolated from yeast'
  - term:
      id: GO:0016514
      label: SWI/SNF complex
    evidence_type: IDA
    original_reference_id: PMID:8159677
    review:
      summary: 'SWI/SNF complex component annotation confirmed by biochemical isolation.'
      action: ACCEPT
      reason: 'Experimental confirmation of SWI2 as SWI/SNF complex member through
        biochemical purification.'
      supported_by:
        - reference_id: PMID:8159677
          supporting_text: 'Five SWI/SNF gene products are components of a large multisubunit
            complex required for transcriptional enhancement'
  - term:
      id: GO:0016514
      label: SWI/SNF complex
    evidence_type: IMP
    original_reference_id: PMID:8159677
    review:
      summary: 'Genetic/functional evidence that SWI2 is part of SWI/SNF complex through
        interaction studies.'
      action: ACCEPT
      reason: 'IMP annotation demonstrating functional interdependence of SWI2 with
        other SWI/SNF subunits (SNF5, SNF6) establishing complex membership.'
      supported_by:
        - reference_id: PMID:8159677
          supporting_text: 'Five SWI/SNF gene products are components of a large multisubunit
            complex'

# MOLECULAR FUNCTION - CORE ATP-DEPENDENT CHROMATIN REMODELING ACTIVITIES
  - term:
      id: GO:0140658
      label: ATP-dependent chromatin remodeler activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: 'Computational annotation via ARBA machine learning model. Core catalytic
        function of SWI2 protein confirmed by multiple IDA and IMP annotations.'
      action: ACCEPT
      reason: 'SWI2 is the primary ATP-dependent helicase-like ATPase of the SWI/SNF
        complex. This is the central enzymatic function and primary molecular activity.
        IEA annotation is backed by strong IDA/IMP evidence.'
      supported_by:
        - reference_id: PMID:8458575
          supporting_text: 'The yeast SNF2/SWI2 protein has DNA-stimulated ATPase
            activity required for transcriptional activation'
        - reference_id: PMID:8016655
          supporting_text: 'Stimulation of GAL4 derivative binding to nucleosomal
            DNA by the yeast SWI/SNF complex'
  - term:
      id: GO:0140658
      label: ATP-dependent chromatin remodeler activity
    evidence_type: IMP
    original_reference_id: PMID:8016655
    review:
      summary: 'IMP annotation from early work demonstrating ATP hydrolysis is required
        for SWI/SNF-mediated nucleosome remodeling and transcriptional activation.'
      action: ACCEPT
      reason: 'Genetic and biochemical evidence that ATP hydrolysis by SWI2 is essential
        for chromatin remodeling activity. Core functional annotation.'
      supported_by:
        - reference_id: PMID:8016655
          supporting_text: 'Stimulation of GAL4 derivative binding to nucleosomal
            DNA by the yeast SWI/SNF complex'
  - term:
      id: GO:0140658
      label: ATP-dependent chromatin remodeler activity
    evidence_type: IDA
    original_reference_id: PMID:8127913
    review:
      summary: 'Direct demonstration of ATP-dependent chromatin remodeling activity
        by isolated SWI/SNF complex containing SWI2.'
      action: ACCEPT
      reason: 'Biochemical characterization showing SWI2-containing SWI/SNF complex
        exhibits ATP-dependent nucleosome remodeling activity.'
      supported_by:
        - reference_id: PMID:8127913
          supporting_text: 'A multisubunit complex containing the SWI1/ADR6, SWI2/SNF2,
            SWI3, SNF5, and SNF6 gene products isolated from yeast'
  - term:
      id: GO:0140658
      label: ATP-dependent chromatin remodeler activity
    evidence_type: IDA
    original_reference_id: PMID:8458575
    review:
      summary: 'Direct biochemical assays demonstrating DNA-stimulated ATPase activity
        of SWI2 and its requirement for nucleosome remodeling.'
      action: ACCEPT
      reason: 'Critical experimental work establishing SWI2 as an ATP-dependent helicase-like
        enzyme with DNA-stimulated ATPase activity required for chromatin remodeling.'
      supported_by:
        - reference_id: PMID:8458575
          supporting_text: 'The yeast SNF2/SWI2 protein has DNA-stimulated ATPase
            activity required for transcriptional activation'
  - term:
      id: GO:0140658
      label: ATP-dependent chromatin remodeler activity
    evidence_type: IMP
    original_reference_id: PMID:8458575
    review:
      summary: 'Genetic evidence that SWI2 ATP hydrolysis activity is functionally
        essential for chromatin remodeling in vivo.'
      action: ACCEPT
      reason: 'Functional analysis showing ATP hydrolysis is required for SWI2-mediated
        chromatin remodeling during transcriptional activation.'
      supported_by:
        - reference_id: PMID:8458575
          supporting_text: 'The yeast SNF2/SWI2 protein has DNA-stimulated ATPase
            activity required for transcriptional activation'

# HISTONE READER ACTIVITIES
  - term:
      id: GO:0140566
      label: histone reader activity
    evidence_type: IDA
    original_reference_id: PMID:12419247
    review:
      summary: 'SWI2 bromodomain directly binds acetylated histones. Multiple IDA
        annotations show histone reader activity on specific histone modifications.'
      action: ACCEPT
      reason: 'SWI2 contains a bromodomain that recognizes acetylated lysine residues
        on histone H3 and H4. This is a core molecular function enabling recruitment
        to acetylated chromatin regions.'
      supported_by:
        - reference_id: PMID:12419247
          supporting_text: 'Function and selectivity of bromodomains in anchoring
            chromatin-modifying complexes to promoter nucleosomes'
  - term:
      id: GO:0140566
      label: histone reader activity
    evidence_type: IMP
    original_reference_id: PMID:12419247
    review:
      summary: 'Functional evidence that SWI2 histone-binding capability is required
        for normal SWI/SNF function in vivo.'
      action: ACCEPT
      reason: 'Genetic studies demonstrate that SWI2 bromodomain-mediated histone
        binding is functionally important for chromatin remodeling in vivo.'
      supported_by:
        - reference_id: PMID:12419247
          supporting_text: 'Function and selectivity of bromodomains in anchoring
            chromatin-modifying complexes to promoter nucleosomes'
  - term:
      id: GO:0140008
      label: histone H4 reader activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: 'ARBA machine learning annotation predicting H4 reader activity. Supported
        by experimental data on SWI2 bromodomain specificity.'
      action: ACCEPT
      reason: 'SWI2 bromodomain recognizes acetylated histone H4. IEA is backed by
        experimental IDA evidence for H4-specific binding.'
      supported_by:
        - reference_id: PMID:20126658
          supporting_text: 'Biochemical profiling of histone binding selectivity of
            the yeast bromodomain family'
  - term:
      id: GO:0140008
      label: histone H4 reader activity
    evidence_type: IDA
    original_reference_id: PMID:20126658
    review:
      summary: 'Direct biochemical characterization of SWI2 bromodomain binding selectivity
        for acetylated histone H4 peptides.'
      action: ACCEPT
      reason: 'Experimental demonstration that SWI2 bromodomain specifically recognizes
        acetylated histone H4 residues, establishing histone H4 reader activity as
        a core function.'
      supported_by:
        - reference_id: PMID:20126658
          supporting_text: 'Biochemical profiling of histone binding selectivity of
            the yeast bromodomain family'
  - term:
      id: GO:0140015
      label: histone H3K14ac reader activity
    evidence_type: IDA
    original_reference_id: PMID:20126658
    review:
      summary: 'Biochemical demonstration of SWI2 bromodomain binding to acetylated
        histone H3K14. Specific histone reader function.'
      action: ACCEPT
      reason: 'Direct experimental evidence of SWI2 bromodomain recognizing acetylated
        lysine 14 on histone H3, demonstrating specificity of histone reader activity.'
      supported_by:
        - reference_id: PMID:20126658
          supporting_text: 'Biochemical profiling of histone binding selectivity of
            the yeast bromodomain family'

# DNA BINDING AND NUCLEOSOMAL DNA BINDING
  - term:
      id: GO:0003677
      label: DNA binding
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: 'IBA annotation reflecting DNA binding activity of SNF2 family proteins
        across eukaryotes. SWI2 binds DNA through its helicase-like domain and AT-hook
        motifs.'
      action: ACCEPT
      reason: 'SWI2 contains DNA-binding domains (AT-hooks and helicase-like domain)
        and functions as an ATP-dependent DNA translocase. DNA binding is a prerequisite
        for nucleosome remodeling activity.'
      supported_by:
        - reference_id: PMID:8016655
          supporting_text: 'Stimulation of GAL4 derivative binding to nucleosomal
            DNA by the yeast SWI/SNF complex'
  - term:
      id: GO:0003677
      label: DNA binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: 'InterPro-based IEA annotation for DNA binding based on AT-hook motif
        domain detection.'
      action: ACCEPT
      reason: 'While correct and subsumed by more specific nucleosomal DNA binding
        annotations, it is consistent with IBA evidence and appropriate to keep.'
      supported_by:
        - reference_id: PMID:8016655
          supporting_text: 'Stimulation of GAL4 derivative binding to nucleosomal
            DNA by the yeast SWI/SNF complex'
  - term:
      id: GO:0031492
      label: nucleosomal DNA binding
    evidence_type: IDA
    original_reference_id: PMID:18644858
    review:
      summary: 'Direct biochemical demonstration that SWI2 specifically binds nucleosomal
        DNA with high affinity.'
      action: ACCEPT
      reason: 'More specific and informative than generic DNA binding. SWI2 directly
        binds nucleosomal DNA as a critical step in chromatin remodeling. This is
        a core functional annotation more specific than GO:0003677.'
      supported_by:
        - reference_id: PMID:18644858
          supporting_text: 'Architecture of the SWI/SNF-nucleosome complex'
  - term:
      id: GO:0000182
      label: rDNA binding
    evidence_type: IDA
    original_reference_id: PMID:23437238
    review:
      summary: 'Specific demonstration that SWI2 binds ribosomal DNA sequences. Shows
        SWI2 involvement in rDNA transcriptional regulation.'
      action: ACCEPT
      reason: 'SWI2 is recruited to rDNA loci and participates in regulation of RNA
        polymerase I transcription. Specific and supported by experimental evidence.'
      supported_by:
        - reference_id: PMID:23437238
          supporting_text: 'The SWI/SNF chromatin remodeling complex influences transcription
            by RNA polymerase I in Saccharomyces cerevisiae'

# CHROMATIN BINDING
  - term:
      id: GO:0003682
      label: chromatin binding
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: 'IBA annotation for chromatin binding capability. SWI2 must bind chromatin
        to perform all its remodeling functions. Phylogenetic inference is appropriate.'
      action: ACCEPT
      reason: 'SWI2 must bind chromatin/nucleosomes to perform its catalytic functions.
        Chromatin binding is a core property of this chromatin remodeling enzyme.'
      supported_by:
        - reference_id: PMID:18644858
          supporting_text: 'Architecture of the SWI/SNF-nucleosome complex'

# HISTONE BINDING
  - term:
      id: GO:0042393
      label: histone binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: 'InterPro-based annotation inferring histone binding from SnAC domain
        (histone-binding domain). SWI2 contacts histone core through multiple domains.'
      action: KEEP_AS_NON_CORE
      reason: 'While correct, this is a general annotation subsumed by more specific
        histone reader activity annotations (H3, H4 acetyl-lysine binding). Keep for
        completeness but note more specific annotations exist.'
      supported_by:
        - reference_id: PMID:20126658
          supporting_text: 'Biochemical profiling of histone binding selectivity of
            the yeast bromodomain family'

# ATP AND NUCLEOTIDE BINDING
  - term:
      id: GO:0005524
      label: ATP binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: 'IEA annotation based on InterPro helicase ATP-binding domain motifs.
        SWI2 contains conserved ATP-binding motifs (Walker A and Walker B boxes).'
      action: KEEP_AS_NON_CORE
      reason: 'ATP binding is a prerequisite for enzymatic function but less informative
        than ATP hydrolysis activity. Correct but subsumed by more specific ATP hydrolysis
        and ATP-dependent chromatin remodeler activity annotations.'
      supported_by:
        - reference_id: PMID:8458575
          supporting_text: 'The yeast SNF2/SWI2 protein has DNA-stimulated ATPase
            activity'
  - term:
      id: GO:0000166
      label: nucleotide binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: 'UniProtKB keyword-based IEA annotation for nucleotide binding. SWI2
        contains nucleotide-binding domains in its helicase region.'
      action: KEEP_AS_NON_CORE
      reason: 'Very general annotation subsumed by ATP binding and ATP hydrolysis
        annotations. Keep for completeness but less informative.'
      supported_by:
        - reference_id: PMID:8458575
          supporting_text: 'The yeast SNF2/SWI2 protein has DNA-stimulated ATPase
            activity required for transcriptional activation'
  - term:
      id: GO:0016887
      label: ATP hydrolysis activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000116
    review:
      summary: 'RHEA-based annotation for ATP hydrolysis activity. SWI2 catalyzes
        ATP hydrolysis as its primary enzymatic reaction. Core function.'
      action: ACCEPT
      reason: 'SWI2 is an ATP-dependent helicase-like enzyme that catalyzes ATP hydrolysis
        coupled to DNA translocation and nucleosome remodeling. This is a core enzymatic
        function.'
      supported_by:
        - reference_id: PMID:8458575
          supporting_text: 'The yeast SNF2/SWI2 protein has DNA-stimulated ATPase
            activity required for transcriptional activation'

# HYDROLASE ACTIVITY
  - term:
      id: GO:0016787
      label: hydrolase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: 'UniProtKB keyword-based annotation that SWI2 has hydrolase activity
        (ATP hydrolysis). Parent term to ATP hydrolysis activity.'
      action: KEEP_AS_NON_CORE
      reason: 'Correct but very general parent term. ATP hydrolysis activity is the
        specific hydrolase function. Keep for completeness but ATP hydrolysis is more
        informative.'
      supported_by:
        - reference_id: PMID:8458575
          supporting_text: 'The yeast SNF2/SWI2 protein has DNA-stimulated ATPase
            activity required for transcriptional activation'

# NUCLEOSOME REMODELING ACTIVITIES
  - term:
      id: GO:0140750
      label: nucleosome array spacer activity
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: 'IBA annotation reflecting the ability of SNF2 family proteins to reposition
        nucleosomes within nucleosome arrays, affecting internucleosomal spacing.'
      action: ACCEPT
      reason: 'SWI2-mediated nucleosome sliding and repositioning affects the spacing
        between adjacent nucleosomes in arrays. This is a specialized nucleosome remodeling
        activity. IBA is appropriate for this well-conserved function.'
      supported_by:
        - reference_id: PMID:8016655
          supporting_text: 'Stimulation of GAL4 derivative binding to nucleosomal
            DNA by the yeast SWI/SNF complex'

# PROTEIN BINDING (IPI ANNOTATIONS)
# These represent confirmed physical interactions with SWI/SNF complex members
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:14660704
    review:
      summary: 'IPI annotation documenting SWI2 protein-protein interactions through
        proteomics. Multiple IPI annotations represent interactions with SWI/SNF subunits
        and other proteins.'
      action: KEEP_AS_NON_CORE
      reason: 'While SWI2 protein interactions are real and documented, generic "protein
        binding" term is uninformative. The specific complex membership (SWI/SNF)
        and individual protein interactions are more useful. Keep as non-core since
        16 IPI annotations document these interactions.'
      supported_by:
        - reference_id: PMID:14660704
          supporting_text: 'Applicability of tandem affinity purification MudPIT to
            pathway proteomics in yeast'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:15506919
    review:
      summary: 'IPI annotation from proteomic analysis identifying SWI2 interactions.
        Part of larger set of interaction annotations.'
      action: KEEP_AS_NON_CORE
      reason: 'Documented protein interactions but subsumed by SWI/SNF complex membership
        and more specific interaction terms (e.g., transcription factor binding).'
      supported_by:
        - reference_id: PMID:15506919
          supporting_text: 'Proteomic analysis of chromatin-modifying complexes in
            Saccharomyces cerevisiae identifies novel subunits'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:16429126
    review:
      summary: 'IPI annotation documenting SWI2 interactions in proteome survey.'
      action: KEEP_AS_NON_CORE
      reason: 'Generic protein binding annotation subsumed by more specific annotations.'
      supported_by:
        - reference_id: PMID:16429126
          supporting_text: 'Proteome survey reveals modularity of the yeast cell machinery'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:16554755
    review:
      summary: 'IPI annotation from global protein complex mapping study.'
      action: KEEP_AS_NON_CORE
      reason: 'Subsumed by complex membership and specific interaction annotations.'
      supported_by:
        - reference_id: PMID:16554755
          supporting_text: 'Global landscape of protein complexes in the yeast Saccharomyces
            cerevisiae'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:17496903
    review:
      summary: 'IPI annotation from study of SWI/SNF assembly and H2A-H2B displacement.'
      action: KEEP_AS_NON_CORE
      reason: 'Subsumed by SWI/SNF complex membership.'
      supported_by:
        - reference_id: PMID:17496903
          supporting_text: 'Swi3p controls SWI/SNF assembly and ATP-dependent H2A-H2B
            displacement'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:22997150
    review:
      summary: 'IPI annotation documenting SWI2 interaction with Hmt1 methyltransferase.'
      action: KEEP_AS_NON_CORE
      reason: 'Specific functional interaction but generic protein binding term is
        uninformative.'
      supported_by:
        - reference_id: PMID:22997150
          supporting_text: 'Proteomic analysis of interactors for yeast protein arginine
            methyltransferase Hmt1 reveals novel substrate and insights into additional
            biological roles'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:28424519
    review:
      summary: 'IPI annotation from cryo-EM structure study of SNF2-nucleosome complex.'
      action: KEEP_AS_NON_CORE
      reason: 'Documented but subsumed by nucleosome binding and complex membership
        annotations.'
      supported_by:
        - reference_id: PMID:28424519
          supporting_text: 'Mechanism of chromatin remodelling revealed by the Snf2-nucleosome
            structure'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:32188938
    review:
      summary: 'IPI annotation from cryo-EM structure of SWI/SNF complex bound to
        nucleosome.'
      action: KEEP_AS_NON_CORE
      reason: 'Subsumed by nucleosome binding and complex membership.'
      supported_by:
        - reference_id: PMID:32188938
          supporting_text: 'Cryo-EM structure of SWI/SNF complex bound to a nucleosome'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:37968396
    review:
      summary: 'IPI annotation from recent protein interactome mapping.'
      action: KEEP_AS_NON_CORE
      reason: 'Generic binding term subsumed by specific interaction terms.'
      supported_by:
        - reference_id: PMID:37968396
          supporting_text: 'The social and structural architecture of the yeast protein
            interactome'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:7623818
    review:
      summary: 'IPI annotation documenting SNF11 interaction with SWI2.'
      action: KEEP_AS_NON_CORE
      reason: 'Subsumed by SWI/SNF complex membership.'
      supported_by:
        - reference_id: PMID:7623818
          supporting_text: 'SNF11, a new component of the yeast SNF-SWI complex that
            interacts with a conserved region of SNF2'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:8016655
    review:
      summary: 'IPI annotation from GAL4 binding and SWI/SNF remodeling study.'
      action: KEEP_AS_NON_CORE
      reason: 'Subsumed by transcription factor binding annotation.'
      supported_by:
        - reference_id: PMID:8016655
          supporting_text: 'Stimulation of GAL4 derivative binding to nucleosomal
            DNA by the yeast SWI/SNF complex'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:8127913
    review:
      summary: 'IPI annotation from isolation of SWI/SNF complex.'
      action: KEEP_AS_NON_CORE
      reason: 'Subsumed by SWI/SNF complex membership.'
      supported_by:
        - reference_id: PMID:8127913
          supporting_text: 'A multisubunit complex containing the SWI1/ADR6, SWI2/SNF2,
            SWI3, SNF5, and SNF6 gene products isolated from yeast'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:8668146
    review:
      summary: 'IPI annotation documenting SWI2 interaction with TFG/TAF30.'
      action: KEEP_AS_NON_CORE
      reason: 'Subsumed by SWI/SNF complex membership.'
      supported_by:
        - reference_id: PMID:8668146
          supporting_text: 'TFG/TAF30/ANC1, a component of the yeast SWI/SNF complex
            that is similar to the leukemogenic proteins ENL and AF-9'
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:9726966
    review:
      summary: 'IPI annotation documenting SWI2 interaction with actin-related proteins
        ARP7 and ARP9.'
      action: KEEP_AS_NON_CORE
      reason: 'Subsumed by SWI/SNF complex membership.'
      supported_by:
        - reference_id: PMID:9726966
          supporting_text: 'Subunits of the yeast SWI/SNF complex are members of the
            actin-related protein (ARP) family'

# TRANSCRIPTION FACTOR BINDING
  - term:
      id: GO:0061629
      label: RNA polymerase II-specific DNA-binding transcription factor binding
    evidence_type: IPI
    original_reference_id: PMID:11865042
    review:
      summary: 'Direct demonstration of SWI2 binding to transcription factors (Gal4).
        This is a core mechanism for SWI/SNF recruitment to target genes.'
      action: ACCEPT
      reason: 'SWI2 and other SWI/SNF subunits are recruited to promoters through
        direct physical interactions with transcription factor activation domains.
        This is the primary recruitment mechanism for SWI/SNF.'
      supported_by:
        - reference_id: PMID:11865042
          supporting_text: 'Transcription activator interactions with multiple SWI/SNF
            subunits'

# BIOLOGICAL PROCESS - CHROMATIN REMODELING
  - term:
      id: GO:0006338
      label: chromatin remodeling
    evidence_type: IDA
    original_reference_id: PMID:11163188
    review:
      summary: 'Direct biochemical demonstration that SWI2-containing complexes catalyze
        chromatin remodeling and nucleosome sliding.'
      action: ACCEPT
      reason: 'Chromatin remodeling is the primary biological process function of
        SWI2. Multiple lines of evidence (IDA, IMP) confirm this is a core function.'
      supported_by:
        - reference_id: PMID:11163188
          supporting_text: 'Generation of superhelical torsion by ATP-dependent chromatin
            remodeling activities'
  - term:
      id: GO:0006338
      label: chromatin remodeling
    evidence_type: IDA
    original_reference_id: PMID:8016655
    review:
      summary: 'Experimental demonstration of SWI/SNF chromatin remodeling catalyzed
        by SWI2.'
      action: ACCEPT
      reason: 'Core functional annotation with strong experimental support.'
      supported_by:
        - reference_id: PMID:8016655
          supporting_text: 'Stimulation of GAL4 derivative binding to nucleosomal
            DNA by the yeast SWI/SNF complex'
  - term:
      id: GO:0006338
      label: chromatin remodeling
    evidence_type: IMP
    original_reference_id: PMID:8016655
    review:
      summary: 'Genetic evidence that SWI2 is required for chromatin remodeling.'
      action: ACCEPT
      reason: 'Functional genetic studies establish SWI2 requirement for in vivo chromatin
        remodeling.'
      supported_by:
        - reference_id: PMID:8016655
          supporting_text: 'Stimulation of GAL4 derivative binding to nucleosomal
            DNA by the yeast SWI/SNF complex'
  - term:
      id: GO:0006338
      label: chromatin remodeling
    evidence_type: IMP
    original_reference_id: PMID:1459453
    review:
      summary: 'Genetic and biochemical evidence that SNF2 and SNF5 are required for
        transcriptional activation through chromatin alteration.'
      action: ACCEPT
      reason: 'Pioneer work establishing SWI2-SNF5 requirement for chromatin remodeling-mediated
        transcriptional activation.'
      supported_by:
        - reference_id: PMID:1459453
          supporting_text: 'Evidence that SNF2/SWI2 and SNF5 activate transcription
            in yeast by altering chromatin structure'
  - term:
      id: GO:0006338
      label: chromatin remodeling
    evidence_type: IGI
    original_reference_id: PMID:1459453
    review:
      summary: 'Genetic interaction studies demonstrating functional interdependence
        of SWI2 with SNF5 and SNF6 in chromatin remodeling.'
      action: ACCEPT
      reason: 'IGI evidence shows SWI2 functions together with other SWI/SNF subunits
        in chromatin remodeling.'
      supported_by:
        - reference_id: PMID:1459453
          supporting_text: 'Evidence that SNF2/SWI2 and SNF5 activate transcription
            in yeast by altering chromatin structure'

# TRANSCRIPTION-RELATED BIOLOGICAL PROCESSES
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: 'IBA annotation reflecting the well-conserved function of SNF2 family
        proteins in transcriptional activation. Core biological role.'
      action: ACCEPT
      reason: 'SWI2 is essential for transcriptional activation of multiple gene classes.
        This is a primary biological function supported by extensive evidence. IBA
        is appropriate for this highly conserved role.'
      supported_by:
        - reference_id: PMID:1339306
          supporting_text: 'SWI1, SWI2 (SNF2), and SWI3 genes are required for transcription
            of HO and INO1 genes...also required for transcription of ADH1, ADH2,
            SUC2, GAL1, and GAL10'
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: 'ARBA machine learning annotation for transcriptional activation. Supported
        by multiple IMP annotations.'
      action: ACCEPT
      reason: 'Computational prediction backed by strong functional evidence. SWI2
        is a positive regulator of RNAP II transcription.'
      supported_by:
        - reference_id: PMID:1339306
          supporting_text: 'Characterization of the yeast SWI1, SWI2, and SWI3 genes,
            which encode a global activator of transcription'
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IMP
    original_reference_id: PMID:10549298
    review:
      summary: 'Genetic evidence that SWI2 is required for Gcn4-mediated transcriptional
        activation in response to amino acid starvation.'
      action: ACCEPT
      reason: 'Functional studies demonstrate SWI2 requirement for transcriptional
        activation of stress-response genes.'
      supported_by:
        - reference_id: PMID:10549298
          supporting_text: 'Transcriptional activation by Gcn4p involves independent
            interactions with the SWI/SNF complex and the SRB/mediator'
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IMP
    original_reference_id: PMID:1339306
    review:
      summary: 'Pioneer work establishing SWI2 function in transcriptional activation.
        Genetic characterization of swi2 mutants.'
      action: ACCEPT
      reason: 'Foundational work establishing SWI2 as a global activator of RNAP II
        transcription.'
      supported_by:
        - reference_id: PMID:1339306
          supporting_text: 'SWI1, SWI2 (SNF2), and SWI3 genes are required for transcription
            of HO and INO1 genes...also required for transcription of ADH1, ADH2,
            SUC2, GAL1, and GAL10'
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IMP
    original_reference_id: PMID:17681272
    review:
      summary: 'Genetic and molecular evidence of SWI2-dependent nucleosome movement
        at the INO1 promoter during gene induction.'
      action: ACCEPT
      reason: 'Detailed mechanistic study showing SWI2-mediated nucleosome repositioning
        enables transcription factor binding and transcriptional activation.'
      supported_by:
        - reference_id: PMID:17681272
          supporting_text: 'A SWI/SNF- and INO80-dependent nucleosome movement at
            the INO1 promoter'
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IGI
    original_reference_id: PMID:1901413
    review:
      summary: 'Genetic interaction studies revealing interdependence of SWI2 with
        other SWI/SNF components in transcriptional activation.'
      action: ACCEPT
      reason: 'IGI evidence demonstrating functional dependence on SWI/SNF complex
        assembly for transcriptional activation.'
      supported_by:
        - reference_id: PMID:1901413
          supporting_text: 'Functional interdependence of the yeast SNF2, SNF5, and
            SNF6 proteins in transcriptional activation'
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IMP
    original_reference_id: PMID:3542227
    review:
      summary: 'SWI2 involvement in cell cycle control of transcription, particularly
        HO gene expression.'
      action: ACCEPT
      reason: 'SWI2 is required for periodic transcriptional activation of HO locus
        during cell cycle.'
      supported_by:
        - reference_id: PMID:3542227
          supporting_text: 'Cell cycle control of the yeast HO gene: cis- and trans-acting
            regulators'
  - term:
      id: GO:0045944
      label: positive regulation of transcription by RNA polymerase II
    evidence_type: IMP
    original_reference_id: PMID:8016655
    review:
      summary: 'Functional evidence that SWI2 ATP hydrolysis is required for transcriptional
        activation.'
      action: ACCEPT
      reason: 'Core functional studies showing ATP-dependent SWI2 activity is essential
        for gene activation.'
      supported_by:
        - reference_id: PMID:8016655
          supporting_text: 'Stimulation of GAL4 derivative binding to nucleosomal
            DNA by the yeast SWI/SNF complex'
  - term:
      id: GO:0006357
      label: regulation of transcription by RNA polymerase II
    evidence_type: IDA
    original_reference_id: PMID:28249159
    review:
      summary: 'SWI2 is directly involved in regulating RNAP II transcription through
        chromatin remodeling at gene promoters.'
      action: ACCEPT
      reason: 'Experimental work on mutant SWI/SNF complexes demonstrates direct requirement
        in transcriptional regulation.'
      supported_by:
        - reference_id: PMID:28249159
          supporting_text: 'Composition and Function of Mutant Swi/Snf Complexes'
  - term:
      id: GO:0006351
      label: DNA-templated transcription
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: 'UniProtKB keyword-based annotation that SWI2 is involved in transcription.'
      action: KEEP_AS_NON_CORE
      reason: 'While correct and supported by strong evidence, more specific annotations
        (positive regulation of RNAP II transcription) are more informative. Keep
        but mark as non-core.'
      supported_by:
        - reference_id: PMID:1339306
          supporting_text: 'SWI1, SWI2 (SNF2), and SWI3 genes are required for transcription
            of HO and INO1 genes...also required for transcription of ADH1, ADH2,
            SUC2, GAL1, and GAL10'
  - term:
      id: GO:0006355
      label: regulation of DNA-templated transcription
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: 'InterPro-based annotation for transcriptional regulation. Subsumed
        by more specific positive regulation annotation.'
      action: KEEP_AS_NON_CORE
      reason: 'General transcriptional regulation term but more specific annotations
        (positive regulation of RNAP II transcription) are more informative.'
      supported_by:
        - reference_id: PMID:1339306
          supporting_text: 'SWI1, SWI2 (SNF2), and SWI3 genes are required for transcription
            of HO and INO1 genes...also required for transcription of ADH1, ADH2,
            SUC2, GAL1, and GAL10'
  - term:
      id: GO:0045815
      label: transcription initiation-coupled chromatin remodeling
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: 'ARBA machine learning annotation for transcription initiation-coupled
        chromatin remodeling. Specific and appropriate function.'
      action: ACCEPT
      reason: 'SWI2 is specifically recruited to promoters during transcription initiation
        and catalyzes nucleosome remodeling coupled to this process. Specific and
        well-supported.'
      supported_by:
        - reference_id: PMID:17681272
          supporting_text: 'A SWI/SNF- and INO80-dependent nucleosome movement at
            the INO1 promoter'
  - term:
      id: GO:0045815
      label: transcription initiation-coupled chromatin remodeling
    evidence_type: IMP
    original_reference_id: PMID:12419247
    review:
      summary: 'Functional evidence that SWI2 bromodomain-mediated histone binding
        is required for transcription initiation-coupled chromatin remodeling.'
      action: ACCEPT
      reason: 'Detailed functional studies show SWI2 recruitment to acetylated nucleosomes
        at promoters and catalysis of initiation-coupled chromatin remodeling.'
      supported_by:
        - reference_id: PMID:12419247
          supporting_text: 'Function and selectivity of bromodomains in anchoring
            chromatin-modifying complexes to promoter nucleosomes'

# DNA REPLICATION
  - term:
      id: GO:0006261
      label: DNA-templated DNA replication
    evidence_type: IMP
    original_reference_id: PMID:10198436
    review:
      summary: 'Genetic evidence that SWI2 is required for DNA replication through
        its role in chromatin remodeling at replication origins.'
      action: ACCEPT
      reason: 'SWI2 participates in DNA replication by remodeling chromatin at replication
        origins to allow replication machinery access. Secondary but documented function.'
      supported_by:
        - reference_id: PMID:10198436
          supporting_text: 'A role for the yeast SWI/SNF complex in DNA replication'

# DNA REPAIR
  - term:
      id: GO:0006302
      label: double-strand break repair
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: 'ARBA annotation for SWI2 involvement in double-strand break repair.
        Supported by experimental IMP evidence.'
      action: ACCEPT
      reason: 'SWI2 is required for efficient double-strand break repair through chromatin
        remodeling at damage sites. IEA backed by experimental evidence.'
      supported_by:
        - reference_id: PMID:16024655
          supporting_text: 'Distinct roles for the RSC and Swi/Snf ATP-dependent chromatin
            remodelers in DNA double-strand break repair'
  - term:
      id: GO:0006302
      label: double-strand break repair
    evidence_type: IMP
    original_reference_id: PMID:16024655
    review:
      summary: 'Genetic and functional evidence that SWI2 and the SWI/SNF complex
        are required for double-strand break repair.'
      action: ACCEPT
      reason: 'Detailed experimental work showing SWI2 function in DSB repair through
        chromatin remodeling. Secondary but important function.'
      supported_by:
        - reference_id: PMID:16024655
          supporting_text: 'Distinct roles for the RSC and Swi/Snf ATP-dependent chromatin
            remodelers in DNA double-strand break repair'

# SPECIALIZED REGULATORY FUNCTIONS
  - term:
      id: GO:0034198
      label: cellular response to amino acid starvation
    evidence_type: IMP
    original_reference_id: PMID:10549298
    review:
      summary: 'SWI2 is required for transcriptional activation of amino acid biosynthesis
        genes in response to amino acid starvation.'
      action: ACCEPT
      reason: 'SWI2 mediates stress response through transcriptional activation of
        amino acid synthesis genes. Documented specific regulatory function.'
      supported_by:
        - reference_id: PMID:10549298
          supporting_text: 'Transcriptional activation by Gcn4p involves independent
            interactions with the SWI/SNF complex and the SRB/mediator'
  - term:
      id: GO:0031496
      label: positive regulation of mating type switching
    evidence_type: IMP
    original_reference_id: PMID:6436497
    review:
      summary: 'SWI2 is required for HO endonuclease gene expression, which initiates
        mating type switching.'
      action: ACCEPT
      reason: 'Seminal work showing SWI2 is essential for HO locus activation and
        mating type switching. Key historical function identifying the gene.'
      supported_by:
        - reference_id: PMID:6436497
          supporting_text: 'Five SWI genes are required for expression of the HO gene
            in yeast'
  - term:
      id: GO:0042148
      label: DNA strand invasion
    evidence_type: IMP
    original_reference_id: PMID:19766565
    review:
      summary: 'SWI2 is required for DNA strand invasion during homologous recombination
        in heterochromatin regions.'
      action: ACCEPT
      reason: 'SWI2 facilitates strand invasion by remodeling heterochromatin and
        making DNA accessible to recombination machinery.'
      supported_by:
        - reference_id: PMID:19766565
          supporting_text: 'Recombinational repair within heterochromatin requires
            ATP-dependent chromatin remodeling'
  - term:
      id: GO:0031507
      label: heterochromatin formation
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: 'IBA annotation suggesting SWI2 involvement in heterochromatin formation.
        However, literature emphasizes SWI2 role in euchromatin and transcriptional
        activation.'
      action: MARK_AS_OVER_ANNOTATED
      reason: 'While SWI2 can access heterochromatin for DNA repair and specific gene
        regulation, its primary role is in euchromatin and transcriptional activation.
        The annotation may reflect SWI2 interaction with heterochromatin rather than
        heterochromatin formation per se. Mark as over-annotated for core SWI2 functions.'
      proposed_replacement_terms:
        - id: GO:0042148
          label: DNA strand invasion
      supported_by:
        - reference_id: PMID:19766565
          supporting_text: 'Recombinational repair within heterochromatin requires
            ATP-dependent chromatin remodeling'
  - term:
      id: GO:1900189
      label: positive regulation of cell adhesion involved in single-species 
        biofilm formation
    evidence_type: IMP
    original_reference_id: PMID:18202364
    review:
      summary: 'SWI2 is required for FLO11 expression, which mediates cell surface
        adhesion and biofilm formation.'
      action: ACCEPT
      reason: 'SWI2 positively regulates FLO11 transcription, which is essential for
        biofilm formation. Specific and documented regulatory function.'
      supported_by:
        - reference_id: PMID:18202364
          supporting_text: 'Identification of novel activation mechanisms for FLO11
            regulation in Saccharomyces cerevisiae'
  - term:
      id: GO:2000219
      label: positive regulation of invasive growth in response to glucose 
        limitation
    evidence_type: IMP
    original_reference_id: PMID:18202364
    review:
      summary: 'SWI2 is required for FLO11-mediated invasive growth in response to
        glucose limitation. Part of nutrient sensing and metabolic stress response.'
      action: ACCEPT
      reason: 'SWI2 mediates transcriptional activation of FLO11 in response to glucose
        limitation, enabling invasive growth. Specific developmental/metabolic function.'
      supported_by:
        - reference_id: PMID:18202364
          supporting_text: 'Identification of novel activation mechanisms for FLO11
            regulation in Saccharomyces cerevisiae'
  - term:
      id: GO:0035973
      label: aggrephagy
    evidence_type: IMP
    original_reference_id: PMID:31846549
    review:
      summary: 'SWI2 is involved in autophagy pathway for clearance of protein aggregates.
        Role in stress response and protein quality control.'
      action: KEEP_AS_NON_CORE
      reason: 'SWI2 involvement in aggrephagy appears to be secondary to its primary
        transcriptional regulatory role. Likely related to transcriptional activation
        of autophagy genes rather than direct participation. Keep for completeness
        but mark as non-core.'
      supported_by:
        - reference_id: PMID:31846549
          supporting_text: 'SWI/SNF chromatin remodelling complex contributes to clearance
            of cytoplasmic protein aggregates and regulates unfolded protein response
            in Saccharomyces cerevisiae'

core_functions:
  - molecular_function:
      id: GO:0140658
      label: ATP-dependent chromatin remodeler activity
    directly_involved_in:
      - id: GO:0045944
        label: positive regulation of transcription by RNA polymerase II
      - id: GO:0006338
        label: chromatin remodeling
    locations:
      - id: GO:0005634
        label: nucleus
    in_complex:
      id: GO:0016514
      label: SWI/SNF complex
    description: 'SWI2 catalyzes ATP-dependent nucleosome sliding, repositioning,
      and rearrangement through its helicase-like ATPase domain to facilitate transcriptional
      activation.'
  - molecular_function:
      id: GO:0140566
      label: histone reader activity
    directly_involved_in:
      - id: GO:0045815
        label: transcription initiation-coupled chromatin remodeling
    description: 'SWI2 bromodomain recognizes and binds acetylated histone H3 and
      H4, enabling recruitment to acetylated chromatin regions at active promoters.'
  - molecular_function:
      id: GO:0061629
      label: RNA polymerase II-specific DNA-binding transcription factor binding
    directly_involved_in:
      - id: GO:0045944
        label: positive regulation of transcription by RNA polymerase II
    description: 'SWI2 physically interacts with acidic activation domains of transcription
      factors, providing the primary recruitment mechanism for SWI/SNF complex to
      target promoters.'
references:
  - id: GO_REF:0000002
    title: Gene Ontology annotation through association of InterPro records with
      GO terms
    findings: []
  - id: GO_REF:0000033
    title: Annotation inferences using phylogenetic trees
    findings: []
  - id: GO_REF:0000043
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword 
      mapping
    findings: []
  - id: GO_REF:0000116
    title: Automatic Gene Ontology annotation based on Rhea mapping
    findings: []
  - id: GO_REF:0000117
    title: Electronic Gene Ontology annotations created by ARBA machine learning
      models
    findings: []
  - id: GO_REF:0000120
    title: Combined Automated Annotation using Multiple IEA Methods
    findings: []
  - id: PMID:10198436
    title: A role for the yeast SWI/SNF complex in DNA replication
    findings: []
  - id: PMID:10549298
    title: Transcriptional activation by Gcn4p involves independent interactions
      with the SWI/SNF complex and the SRB/mediator
    findings: []
  - id: PMID:11163188
    title: Generation of superhelical torsion by ATP-dependent chromatin 
      remodeling activities
    findings: []
  - id: PMID:11865042
    title: Transcription activator interactions with multiple SWI/SNF subunits
    findings: []
  - id: PMID:12419247
    title: Function and selectivity of bromodomains in anchoring 
      chromatin-modifying complexes to promoter nucleosomes
    findings: []
  - id: PMID:1339306
    title: Characterization of the yeast SWI1, SWI2, and SWI3 genes, which 
      encode a global activator of transcription
    findings: []
  - id: PMID:1459453
    title: Evidence that SNF2/SWI2 and SNF5 activate transcription in yeast by 
      altering chromatin structure
    findings: []
  - id: PMID:14660704
    title: Applicability of tandem affinity purification MudPIT to pathway 
      proteomics in yeast
    findings: []
  - id: PMID:15506919
    title: Proteomic analysis of chromatin-modifying complexes in Saccharomyces 
      cerevisiae identifies novel subunits
    findings: []
  - id: PMID:16024655
    title: Distinct roles for the RSC and Swi/Snf ATP-dependent chromatin 
      remodelers in DNA double-strand break repair
    findings: []
  - id: PMID:16429126
    title: Proteome survey reveals modularity of the yeast cell machinery
    findings: []
  - id: PMID:16554755
    title: Global landscape of protein complexes in the yeast Saccharomyces 
      cerevisiae
    findings: []
  - id: PMID:17496903
    title: Swi3p controls SWI/SNF assembly and ATP-dependent H2A-H2B 
      displacement
    findings: []
  - id: PMID:17681272
    title: A SWI/SNF- and INO80-dependent nucleosome movement at the INO1 
      promoter
    findings: []
  - id: PMID:18202364
    title: Identification of novel activation mechanisms for FLO11 regulation in
      Saccharomyces cerevisiae
    findings: []
  - id: PMID:18644858
    title: Architecture of the SWI/SNF-nucleosome complex
    findings: []
  - id: PMID:1901413
    title: Functional interdependence of the yeast SNF2, SNF5, and SNF6 proteins
      in transcriptional activation
    findings: []
  - id: PMID:19766565
    title: Recombinational repair within heterochromatin requires ATP-dependent 
      chromatin remodeling
    findings: []
  - id: PMID:20126658
    title: Biochemical profiling of histone binding selectivity of the yeast 
      bromodomain family
    findings: []
  - id: PMID:22842922
    title: Dissecting DNA damage response pathways by analysing protein 
      localization and abundance changes during DNA replication stress
    findings: []
  - id: PMID:22932476
    title: The nuclear localization of SWI/SNF proteins is subjected to oxygen 
      regulation
    findings: []
  - id: PMID:22997150
    title: Proteomic analysis of interactors for yeast protein arginine 
      methyltransferase Hmt1 reveals novel substrate and insights into 
      additional biological roles
    findings: []
  - id: PMID:23437238
    title: The SWI/SNF chromatin remodeling complex influences transcription by 
      RNA polymerase I in Saccharomyces cerevisiae
    findings: []
  - id: PMID:28249159
    title: Composition and Function of Mutant Swi/Snf Complexes
    findings: []
  - id: PMID:28424519
    title: Mechanism of chromatin remodelling revealed by the Snf2-nucleosome 
      structure
    findings: []
  - id: PMID:31846549
    title: SWI/SNF chromatin remodelling complex contributes to clearance of 
      cytoplasmic protein aggregates and regulates unfolded protein response in 
      Saccharomyces cerevisiae
    findings: []
  - id: PMID:32188938
    title: Cryo-EM structure of SWI/SNF complex bound to a nucleosome
    findings: []
  - id: PMID:3542227
    title: Cell cycle control of the yeast HO gene cis- and trans-acting 
      regulators
    findings: []
  - id: PMID:37968396
    title: The social and structural architecture of the yeast protein 
      interactome
    findings: []
  - id: PMID:6436497
    title: Five SWI genes are required for expression of the HO gene in yeast
    findings: []
  - id: PMID:7623818
    title: SNF11, a new component of the yeast SNF-SWI complex that interacts 
      with a conserved region of SNF2
    findings: []
  - id: PMID:8016655
    title: Stimulation of GAL4 derivative binding to nucleosomal DNA by the 
      yeast SWI/SNF complex
    findings: []
  - id: PMID:8127913
    title: A multisubunit complex containing the SWI1/ADR6, SWI2/SNF2, SWI3, 
      SNF5, and SNF6 gene products isolated from yeast
    findings: []
  - id: PMID:8159677
    title: Five SWI/SNF gene products are components of a large multisubunit 
      complex required for transcriptional enhancement
    findings: []
  - id: PMID:8458575
    title: The yeast SNF2/SWI2 protein has DNA-stimulated ATPase activity 
      required for transcriptional activation
    findings: []
  - id: PMID:8668146
    title: TFG/TAF30/ANC1, a component of the yeast SWI/SNF complex that is 
      similar to the leukemogenic proteins ENL and AF-9
    findings: []
  - id: PMID:9726966
    title: Subunits of the yeast SWI/SNF complex are members of the 
      actin-related protein (ARP) family
    findings: []
  - id: file:yeast/SWI2/SWI2-deep-research-perplexity.md
    title: Deep research report on SWI2
    findings: []

SWI2

Gene Description

Existing Annotations Review

Core Functions

SWI2 catalyzes ATP-dependent nucleosome sliding, repositioning, and rearrangement through its helicase-like ATPase domain to facilitate transcriptional activation.

SWI2 bromodomain recognizes and binds acetylated histone H3 and H4, enabling recruitment to acetylated chromatin regions at active promoters.

SWI2 physically interacts with acidic activation domains of transcription factors, providing the primary recruitment mechanism for SWI/SNF complex to target promoters.

References

📚 Additional Documentation

Deep Research Perplexity

Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

Target Gene/Protein Identity (from UniProt):

MANDATORY VERIFICATION STEPS:

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

Research Target:

Output

Comprehensive Functional Annotation of SNF2/SWI2: An ATP-Dependent Chromatin Remodeling Enzyme in Saccharomyces cerevisiae

Structural Organization and Domain Architecture of the SNF2 Protein

The SWI/SNF Complex: Architecture, Composition, and Modularity

Biochemical Mechanism of ATP-Dependent Chromatin Remodeling

Chromatin Remodeling Activities: Nucleosome Sliding, Eviction, and Histone Exchange

Gene Regulation and Transcriptional Activation

Role in Metabolic Gene Regulation and Nutrient Sensing

Roles in DNA Repair and Genome Stability

Regulation by Post-Translational Modifications

Cellular Localization and Subcellular Distribution

Evolutionary Conservation and SNF2 Family Structure

Disease Relevance and Cancer Mutations

Specialized Functions in Distinct Biological Processes

Conclusion and Significance

Citations

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