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this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.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.
The gene symbol "SDD3" is ambiguous and refers to multiple distinct proteins across different organisms and contexts. Literature searches revealed at least two unrelated uses of this symbol: (1) "Sdd3" as a single-stranded DNA deaminase identified through AlphaFold2-based structural clustering of deaminase proteins, used in cytosine base editing applications (huang2023discoveryofdeaminase pages 11-13, huang2024discoveringdeaminasesusing pages 1-2); and (2) "Sdd3" as a regulator of biofilm formation in Candida albicans acting through the Rho1-PKC-MAPK signaling pathway (wu2026thepathogenicityand pages 18-19). Neither of these proteins corresponds to the target gene YOL098C in Saccharomyces cerevisiae (strain ATCC 204508 / S288c). The following report is based strictly on information pertaining to the UniProt Q12496 entry for YOL098C and functional inferences drawn from its conserved domain architecture.
YOL098C (also designated HRF1037) is an open reading frame on chromosome XV of S. cerevisiae (strain S288c). According to UniProt (accession Q12496), it encodes an uncharacterized protein with no experimentally validated standard gene name. The protein contains the following InterPro domains:
These domain annotations place YOL098C squarely within the M16 family of metalloendopeptidases (clan ME in the MEROPS classification). No primary literature was identified that directly characterizes the function, substrate specificity, localization, or biological role of YOL098C.
The M16 family of metallopeptidases are zinc-dependent endopeptidases characterized by several shared features (jarzab2025ittakestwo pages 2-5, jarzab2025ittakestwo pages 7-9):
The M16 family is subdivided into three subfamilies (jarzab2025ittakestwo pages 2-5):
M16A and M16C members share similar molecular organization and degrade various peptides with chain lengths in the range of 30–70 amino acid residues. They are referred to as "peptidasomes" by analogy with proteasomes (jarzab2025ittakestwo pages 2-5). In contrast, M16B members function specifically as processing peptidases that cut short N-terminal targeting sequences.
Given that YOL098C possesses both PF00675 (Peptidase_M16, the N-terminal catalytic half) and PF05193 (Peptidase_M16_C, the C-terminal regulatory half), it is predicted to be a monomeric M16 metalloendopeptidase belonging to either the M16A or M16C subfamily. This domain architecture is consistent with a peptidasome-type function — i.e., degradation of peptide substrates within an enclosed catalytic chamber.
S. cerevisiae encodes several characterized M16 family members, providing context for the uncharacterized YOL098C. The following table summarizes these proteins:
| Protein / gene | Systematic name | M16 subfamily / architecture | Known or inferred function | Localization | Evidence / notes |
|---|---|---|---|---|---|
| YOL098C (target; UniProt Q12496) | YOL098C / HRF1037 | Likely M16A or M16C-like monomeric M16 metallopeptidase; contains Peptidase_M16 and Peptidase_M16_C domains | Uncharacterized; domain architecture supports a zinc-dependent metalloendopeptidase/peptidasome-like role, but no specific substrate, reaction, or pathway has been experimentally established | Not securely established; no confirmed localization from the retrieved literature | The queried symbol “SDD3” is ambiguous and literature is limited for this specific protein. UniProt/domain annotation supports M16-family membership, but direct functional studies were not found. M16A/C enzymes are generally monomeric ~100 kDa peptidasomes with four-domain “clamshell” architecture and HXXEH zinc-binding motif (jarzab2025ittakestwo pages 2-5, jarzab2025ittakestwo pages 7-9) |
| MPP α subunit (Mas2) | MAS2 | M16B heterodimeric processing peptidase | Mitochondrial processing peptidase subunit involved in cleavage of N-terminal targeting presequences from imported mitochondrial precursor proteins | Mitochondrial matrix / import-processing machinery | Eukaryotic M16B peptidases act as processing peptidases for organelle-targeting sequences; yeast MPP is a canonical M16B member. The glycine-rich loop in the α-subunit contributes to substrate binding (jarzab2025ittakestwo pages 2-5, jarzab2025ittakestwo pages 7-9, jarzab2025ittakestwo pages 5-7) |
| MPP β subunit (Mas1) | MAS1 | M16B heterodimeric processing peptidase | Catalytic MPP subunit; participates with Mas2 in primary cleavage of mitochondrial presequences during protein import | Mitochondrial matrix / import-processing machinery | Yeast MPP is an M16B metallopeptidase complex; M16B members function as processing peptidases rather than general peptidasomes (jarzab2025ittakestwo pages 2-5, jarzab2025ittakestwo pages 5-7) |
| Cym1 | CYM1 | M16C (PreP/PITRM1-type) | Presequence peptide degradation after MPP cleavage; prevents feedback inhibition of MPP by clearing released targeting peptides | Mitochondrial matrix | Cym1 is the yeast homolog of human PITRM1/PreP. Loss of Cym1 causes accumulation of cleaved presequences and feedback inhibition of MPP (gala2021mitochondrialproteasesin pages 7-8, gala2021mitochondrialproteasesin pages 6-7) |
| Axl1 | AXL1 | M16A | Processing of the a-factor mating pheromone precursor | Cytosol / mating pathway-associated processing | Yeast Axl1 is an M16A peptidase with a well-established role in a-factor production; M16A peptidases are monomeric peptidasomes (jarzab2025ittakestwo pages 9-10, jarzab2025ittakestwo pages 2-5) |
| Ste23 | STE23 | M16A | Broadly peptidase-like; implicated in efficient degradation of mitochondrial presequence peptides downstream of MPP; also reported to cleave insulin and amyloid-β in heterologous/biochemical contexts | Mitochondrial matrix (for presequence-degradation role) | Ste23 is described as a novel mitochondrial matrix protease important for presequence degradation/processing in yeast; it is also grouped with Axl1 as a yeast M16A peptidase (jarzab2025ittakestwo pages 9-10, jarzab2025ittakestwo pages 27-28) |
Table: This table summarizes the characterized M16 metallopeptidase family members in Saccharomyces cerevisiae and places the uncharacterized target YOL098C in that family context. It is useful for distinguishing the ambiguous target from better-studied yeast M16 proteins and for inferring likely function from conserved domain architecture.
The key characterized yeast M16 members include:
MPP (Mas1/Mas2, M16B): The essential mitochondrial processing peptidase that cleaves N-terminal targeting presequences from nuclear-encoded mitochondrial precursor proteins upon their import into the matrix (jarzab2025ittakestwo pages 5-7, gala2021mitochondrialproteasesin pages 7-8).
Cym1 (YDR430C, M16C): The yeast ortholog of human PITRM1/PreP. Cym1 is a mitochondrial matrix peptidase responsible for degrading cleaved presequence peptides after MPP processing. Loss of Cym1 results in accumulation of presequence peptides, which causes feedback inhibition of MPP, thereby impairing mitochondrial protein import (gala2021mitochondrialproteasesin pages 7-8, gala2021mitochondrialproteasesin pages 6-7). Deletion of CYM1 has also been reported to decrease proteolytic activity and improve secretion of recombinant proteins in yeast expression systems (berlec2013currentstateand pages 8-9).
Axl1 and Ste23 (M16A): Axl1 is involved in the production of the a-factor mating pheromone. Ste23 has been characterized as a mitochondrial matrix protease that is required for efficient degradation of presequence peptides generated by MPP and can cleave insulin and amyloid-β peptides in biochemical assays (jarzab2025ittakestwo pages 9-10, jarzab2025ittakestwo pages 27-28).
YOL098C represents an additional, uncharacterized M16 family member in the yeast genome. Its function has not been experimentally determined, and it is not known whether it is functionally redundant with Cym1, Ste23, or Axl1, or whether it has a distinct role.
Based on the presence of both N-terminal and C-terminal M16 metallopeptidase domains, YOL098C is predicted to:
The M16C subfamily member PreP (human PITRM1) and its yeast ortholog Cym1 provide particularly informative models. PreP is a ~105 kDa zinc-dependent metallopeptidase that specifically degrades targeting peptides, including those from mitochondrial ATP synthase F1β and chloroplastic small subunit of Rubisco (ghifari2019thepeptidasesinvolved pages 6-7). PreP preferentially cleaves positively charged residues at the P'1 position and serine or neutral amino acids at the P1 position (ghifari2019thepeptidasesinvolved pages 7-8). The catalytic mechanism involves hinge-bending motions that transition the enzyme from open to closed states upon substrate binding, bringing critical C-terminal residues (the R/Y pair) to the active site to stabilize the transition state (jarzab2025ittakestwo pages 18-19).
Whether YOL098C shares these substrate preferences or catalytic properties remains to be determined experimentally.
The subcellular localization of YOL098C has not been conclusively established in the retrieved literature. Many M16 family peptidases function in the mitochondrial matrix (e.g., MPP, Cym1, Ste23) (gala2021mitochondrialproteasesin pages 7-8, jarzab2025ittakestwo pages 27-28), suggesting that YOL098C may also localize to mitochondria. However, other M16 family members (e.g., Axl1, IDE) function in the cytosol (jarzab2025ittakestwo pages 9-10). Without experimental localization data specific to YOL098C, its compartmentalization remains uncertain. Systematic approaches such as the Huh et al. (2003) GFP localization study and the more recent bi-genomic split-GFP assay (bykov2025asystematicbigenomic pages 1-2, bykov2025asystematicbigenomic pages 3-5) have been applied to the yeast proteome, but no data specifically confirming YOL098C's mitochondrial or cytosolic localization was found in the papers retrieved.
Given its M16 domain architecture, YOL098C may participate in one or more of the following pathways:
This report must be interpreted with the following limitations:
In summary, YOL098C encodes a putative M16 metalloendopeptidase in S. cerevisiae with the hallmark domain architecture of this enzyme family. By structural inference, it is predicted to function as a zinc-dependent peptidasome that degrades peptide substrates of approximately 30–70 residues within an enclosed catalytic chamber. Its precise substrate specificity, subcellular localization, and biological role await experimental characterization. The most informative functional model derives from characterized yeast M16 family members — particularly Cym1 (M16C, presequence peptidase) and Ste23/Axl1 (M16A, pheromone processing/presequence degradation) — which collectively suggest a role in peptide degradation, potentially within the mitochondrial protein import pathway or in cellular peptide quality control.
References
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