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this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.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 target is human ATG2A (autophagy-related protein 2 homolog A; UniProt Q2TAZ0; synonym KIAA0404), a large rod-like ATG2/RBG-family bridge lipid-transfer protein implicated in autophagosome membrane expansion and other lipid-transfer contexts. This identity is consistent across recent reviews and primary literature describing ATG2A as a long, groove-containing bulk lipid transporter/tether that works with WIPI proteins and ATG9 scramblases. (duarte2023theorganizationand pages 4-5, chiduza2024atg9bisa pages 1-2, vliet2024exploringtheatg9a pages 1-3)
Macroautophagy (often “autophagy”) requires de novo growth of a cup-shaped precursor membrane, the phagophore, into a closed autophagosome. A major conceptual advance is that phagophore growth is driven not only by vesicle fusion but also by non-vesicular bulk lipid transfer at ER–phagophore membrane contact sites (MCSs). ATG2 proteins (ATG2A/B in mammals) are central to this model. (duarte2023theorganizationand pages 9-10, duarte2023theorganizationand pages 13-14)
ATG2A is generally described as a bridge-like/bulk lipid transfer protein: a rod-like protein with a long hydrophobic groove/cavity that can accommodate lipid acyl chains and allow lipids to flow between membranes when the protein tethers them. This is contrasted with “shuttle” lipid transfer proteins that bind and carry single lipids. (duarte2023theorganizationand pages 13-14, duarte2023theorganizationand pages 4-5)
Because bridge transfer is expected to deliver lipids predominantly into the cytosolic leaflet of a target membrane, efficient phagophore growth also requires lipid scrambling to equilibrate lipids between leaflets. The core model therefore couples ATG2A-mediated transfer with ATG9A/B scramblase activity, and ER scramblases VMP1/TMEM41B on the donor side. (chiduza2024atg9bisa pages 1-2, vliet2024exploringtheatg9a pages 1-3)
ATG2A is a tether and lipid transfer protein concentrated at phagophore extremities/rims where ER–phagophore contacts form. Purified ATG2-family proteins can tether membranes and transfer lipids between tethered membranes in vitro, and a principal lipid-transfer module has been mapped to the N-terminus (reported in recent synthesis as ATG2A aa 1–345). (duarte2023theorganizationand pages 5-7, duarte2023theorganizationand pages 9-10)
Structural synthesis describes ATG2A as a large rod (reported ~20 nm length) with a groove compatible with bulk phospholipid transport, fitting a “molecular highway/bridge” model for moving lipids from donor membranes (classically ER) to expanding phagophores. (duarte2023theorganizationand pages 13-14, duarte2023theorganizationand pages 4-5)
A 2023 mechanistic study extended ATG2A’s biology to lipid droplets (LDs), showing ATG2A can catalyze bridge-like phospholipid transport from phospholipid monolayers (LD surfaces) and that bridge-like transport activity is required to prevent LD accumulation in cells. This work argues ATG2A is naturally recruited to monolayers and can transfer phospholipids more efficiently when one interacting surface is an LD-like monolayer. (korfhage2023atg2amediatedbridgelikelipid pages 1-2)
At ER–phagophore MCSs, WIPI4 (WDR45) is described as an ATG2A partner that binds PI3P and supports recruitment/directionality of ATG2A toward PI3P-positive autophagic membranes; recent synthesis notes WIPI4 binds ATG2A more strongly than WIPI1/2. (duarte2023theorganizationand pages 5-7, duarte2023theorganizationand pages 9-10)
Recent reviews and primary literature converge on ATG2A forming a functional complex with ATG9A.
* A 2024 interactome-focused primary study frames ATG9A as a lipid scramblase whose scramblase function is “thought to require” interaction with ATG2A; ATG9A forms a complex with ATG2A and disrupting this complex inhibits autophagy, supporting cooperation in expanding the growing autophagosome. (vliet2024exploringtheatg9a pages 1-3)
* A 2024 mechanistic review of ATG9 paralogs describes ATG2A collaborating with ATG9A to transfer lipids to the growing autophagosome. It further summarizes structural modeling in which ATG2A’s C-terminus interacts with ATG9A to form a complex that couples ATG2A lipid transfer with ATG9 scramblase activity (described as essential for autophagosome biogenesis). (chiduza2024atg9bisa pages 1-2)
* A 2023 synthesis of ER–phagophore contact sites identifies two ATG9A-interacting sequences in ATG2A and reports that deleting the S2 region (mapped to the CLR, ~aa 1760–1779) reduces ATG2A–ATG9A binding and impairs autophagy progression. (duarte2023theorganizationand pages 5-7)
Together, these sources support the current consensus: ATG2A (bridge transfer) + ATG9A/B (scrambling) form a core lipid-supply machine for phagophore expansion. (duarte2023theorganizationand pages 5-7, chiduza2024atg9bisa pages 1-2, vliet2024exploringtheatg9a pages 1-3)
A 2024 review of ATG9B/ATG9A biology summarizes that ER-resident scramblases VMP1 and TMEM41B interact with the N-terminus of ATG2A, and along with ATG9A are proposed to form a core lipid transfer/scrambling complex at ER–phagophore contact sites, with local ER lipid synthesis providing directionality. (chiduza2024atg9bisa pages 1-2)
A complementary biochemical synthesis also describes ATG2 N-terminal targeting to the ER through interactions with VMP1 and TMEM41B, placing these interactions in a mechanistic model for driving net lipid flux at the contact. (nguyen2023biochemicalreconstitutionof pages 134-138)
ATG2A contains conserved LIR motifs and is described as interacting with GABARAP-family ATG8 proteins, which is functionally important for sustaining phagophore formation and/or autophagosome closure in starvation conditions (as summarized in a 2023 contact-site review and a 2023 high-authority autophagy-gene review). (duarte2023theorganizationand pages 4-5, yamamoto2023autophagygenesin pages 16-17)
In addition, in a 2023 primary study of lysosome damage responses (CASM; see Section 5), ATG2–ATG8 engagement upon lysosomal damage depended on the ATG2A LIR region (rather than the WIPI4-binding region) in ATG2A/B DKO reconstitution assays, supporting an ATG8-dependent recruitment mode for ATG2 under non-canonical autophagy stimuli. (cross2023lysosomedamagetriggers pages 6-7)
A key 2024 advance is identification of ANKFY1 as an ATG2A-binding factor that is endosome-localized and promotes ATG2A-mediated lipid transfer from endosomes to phagophores.
Mechanistically, Wei et al. (Cell Discovery; published April 2024; https://doi.org/10.1038/s41421-024-00659-y) report:
* ANKFY1 depletion impairs autophagosome growth and reduces autophagy flux, largely phenocopying ATG2A/B depletion.
* Purified ANKFY1 binds PI3P via its FYVE domain and enhances ATG2A-mediated lipid transfer between PI3P-containing liposomes.
* The authors propose ANKFY1 recruits ATG2A to PI3P-enriched endosomes, enabling endosome-to-phagophore lipid donation.
(wei2024ankfy1bridgesatg2amediated pages 1-2)
A schematic model of the ANKFY1/WIPI4/ATG2A liposome-transfer assay and the proposed endosome→phagophore lipid-transfer concept is shown in the retrieved figure panel. (wei2024ankfy1bridgesatg2amediated media 2bca71a4)
Current synthesis places ATG2A at phagophore extremities/rims, where it establishes/maintains close contacts with the ER (ER–phagophore MCSs) together with ATG9 and WIPI proteins. Recruitment is described as involving coincidence of ATG9 binding and PI3P-dependent WIPI binding, producing localization specificity to the right membrane subdomains. (duarte2023theorganizationand pages 5-7, duarte2023theorganizationand pages 9-10)
The ANKFY1 discovery supports a model in which ATG2A can also function at endosome–phagophore interfaces, transferring PI3P and other lipids from PI3P-enriched endosomes to the phagophore during autophagy. (wei2024ankfy1bridgesatg2amediated pages 1-2, wei2024ankfy1bridgesatg2amediated media 2bca71a4)
ATG2A localizes to lipid droplets, and 2023 mechanistic work provides evidence that ATG2A’s bridge-like lipid transport regulates LD accumulation and that ATG2A has enhanced recruitment/activity on LD monolayers. (korfhage2023atg2amediatedbridgelikelipid pages 1-2)
Two influential 2023 reviews synthesized emerging structural and biochemical data into a now widely used conceptual framework: autophagosomal membrane expansion is driven by coordinated action of bulk lipid transfer proteins (ATG2 family) and scramblases (ATG9, VMP1, TMEM41B) at ER–phagophore contacts. (duarte2023theorganizationand pages 13-14, yamamoto2023autophagygenesin pages 16-17)
The 2024 ANKFY1 study provides direct evidence for a non-ER donor route, proposing endosomes as lipid sources for phagophore expansion via ATG2A when ANKFY1 recruits/activates the transfer on PI3P membranes. (wei2024ankfy1bridgesatg2amediated pages 1-2, wei2024ankfy1bridgesatg2amediated media 2bca71a4)
Cross et al. (J Cell Biol; October 2023; https://doi.org/10.1083/jcb.202303078) report that lysosome damage triggers ATG8 conjugation (CASM) and promotes ATG2 engagement. In their system, a robust GFP-LC3A–ATG2B interaction was induced by lysosomotropic damage (LLOMe) and depended on LC3A lipidation and CASM-specific ATG16L1 function. ATG2–LC3 engagement required the ATG2 LIR rather than WIPI4-binding region, supporting a distinct recruitment logic under lysosomal stress. (cross2023lysosomedamagetriggers pages 6-7)
Chiduza et al. (Autophagy; online 2024; https://doi.org/10.1080/15548627.2023.2275905) describe ATG9B as a tissue-specific lipid scramblase that can compensate for ATG9A and reports that ATG9B can form a heteromeric complex with ATG2A, fitting the model of a coupled ATG2A–ATG9 scramblase module. (chiduza2024atg9bisa pages 1-2)
ATG2A is routinely used as a mechanistic handle for autophagosome biogenesis and membrane contact site biology via:
* ATG2A/B double knockout (DKO) systems plus rescue with WT or mutant ATG2A (e.g., LIR-deficient) to test requirements for autophagosome maturation/closure and stress-induced recruitment modes. (cross2023lysosomedamagetriggers pages 6-7)
* Coupled assays with ATG9A/B to dissect lipid transfer/scrambling coupling and to model membrane expansion defects relevant to proteostasis, neurobiology, and metabolic homeostasis. (chiduza2024atg9bisa pages 1-2, vliet2024exploringtheatg9a pages 1-3)
These are “real-world” implementations in the sense of widely applied experimental platforms; however, this evidence set does not establish any ATG2A-targeting therapeutic currently used clinically.
High-authority reviews highlight that mutations in autophagy genes broadly contribute to human disease and emphasize lipid transfer at membrane contact sites as a key mechanism with disease relevance; ATG2-family function is central to this mechanistic theme. (duarte2023theorganizationand pages 13-14, yamamoto2023autophagygenesin pages 16-17)
Within the retrieved evidence, direct clinical applications (e.g., approved drugs targeting ATG2A) are not described; thus, translational relevance is primarily mechanism-driven (guiding target prioritization and pathway interpretation) rather than direct ATG2A intervention.
ATG2A as the central bridge lipid-transfer factor for autophagosome expansion: 2023 reviews consolidate ATG2A as a core tether/transfer component at ER–phagophore contacts, analogous to VPS13-family bridge transfer proteins, establishing a prevailing “bulk lipid transfer + scramblase coupling” model for membrane growth. (duarte2023theorganizationand pages 13-14, yamamoto2023autophagygenesin pages 16-17)
Mechanistic coupling is essential: Synthesis of ATG2A–ATG9 interactions (including mapped binding sites such as the ATG2A CLR-associated S2) supports a view that physical coupling between transfer (ATG2A) and scrambling (ATG9) is required for productive bilayer expansion and autophagy progression. (duarte2023theorganizationand pages 5-7, chiduza2024atg9bisa pages 1-2)
Multiple donor routes likely exist: The ANKFY1 discovery provides evidence that ATG2A can be recruited to PI3P-positive endosomes and that endosomes may contribute lipids to phagophores. This suggests lipid sourcing is more flexible than an “ER-only” model and may be tuned by PI3P effectors and tethering factors. (wei2024ankfy1bridgesatg2amediated pages 1-2, wei2024ankfy1bridgesatg2amediated media 2bca71a4)
The following retrieved figure shows the ANKFY1/WIPI4-assisted ATG2A lipid transfer model used in Wei et al. (2024), supporting the endosome-to-phagophore lipid donation concept.
(wei2024ankfy1bridgesatg2amediated media 2bca71a4)
The table below provides a compact mapping of ATG2A identity, functions, partners, localization, quantitative findings, and 2023–2024 developments.
| Aspect | Key points |
|---|---|
| Identity/domains | - Verified target: human ATG2A (UniProt Q2TAZ0), autophagy-related protein 2 homolog A; member of the ATG2/RBG bridge-like lipid transfer family with a rod-like architecture (duarte2023theorganizationand pages 4-5, chiduza2024atg9bisa pages 1-2, vliet2024exploringtheatg9a pages 1-3) - Contains an N-terminal chorein/N_chorein lipid-transfer module and a long hydrophobic groove/cavity consistent with bulk phospholipid transport (duarte2023theorganizationand pages 4-5, wei2024ankfy1bridgesatg2amediated pages 1-2) - Has a C-terminal CLR with amphipathic helices for membrane association, plus conserved LIR motifs and ATG9-binding regions including an S2 site around aa 1760–1779 (duarte2023theorganizationand pages 5-7, duarte2023theorganizationand pages 4-5) |
| Core molecular function | - Primary function is bulk/bridge-like lipid transfer to support phagophore expansion during autophagosome biogenesis (duarte2023theorganizationand pages 9-10, yamamoto2023autophagygenesin pages 16-17, vliet2024exploringtheatg9a pages 1-3) - Also acts as a membrane tether at ER–phagophore contact sites; purified ATG2 proteins tether highly curved membranes and transfer lipids between tethered membranes in vitro (duarte2023theorganizationand pages 5-7, wei2024ankfy1bridgesatg2amediated pages 1-2) - Outside canonical autophagosome growth, ATG2A can mediate bridge-like phospholipid transport on lipid droplet monolayers, affecting lipid droplet homeostasis (korfhage2023atg2amediatedbridgelikelipid pages 1-2) |
| Key interaction partners | - WIPI4/WDR45 is a strong ATG2A partner that helps target ATG2A toward PI3P-rich autophagic membranes and enhances tethering/lipid transfer directionality (duarte2023theorganizationand pages 5-7, duarte2023theorganizationand pages 9-10) - ATG9A/ATG9B interact functionally and physically with ATG2A; the complex couples ATG2A lipid transfer to ATG9 scramblase activity and is essential for phagophore expansion (duarte2023theorganizationand pages 5-7, chiduza2024atg9bisa pages 1-2, vliet2024exploringtheatg9a pages 1-3) - VMP1 and TMEM41B interact with the ATG2A N terminus at the ER side of the contact, while ANKFY1 was identified in 2024 as an endosomal ATG2A-binding factor that promotes PI3P-dependent lipid transfer from endosomes to phagophores (nguyen2023biochemicalreconstitutionof pages 134-138, wei2024ankfy1bridgesatg2amediated pages 1-2, chiduza2024atg9bisa pages 1-2) |
| Subcellular localization | - Enriched at phagophore extremities/rims and ER–phagophore membrane contact sites, including omegasome-associated regions during autophagosome formation (duarte2023theorganizationand pages 9-10, duarte2023theorganizationand pages 15-15) - Localizes with ATG9 and WIPI4 on early autophagic membranes, with coincidence binding to PI3P and ATG9 helping recruitment/specificity (duarte2023theorganizationand pages 5-7, duarte2023theorganizationand pages 9-10) - Additional pools localize to lipid droplets and, in 2024 work, to interfaces between PI3P-positive endosomes and phagophores via ANKFY1 (duarte2023theorganizationand pages 15-15, wei2024ankfy1bridgesatg2amediated pages 1-2, korfhage2023atg2amediatedbridgelikelipid pages 1-2) |
| Mechanistic model | - Current model: ATG2A forms a lipid bridge/highway between donor and acceptor membranes, transferring lipids from the ER to the expanding phagophore while scramblases equilibrate lipids across bilayer leaflets (duarte2023theorganizationand pages 13-14, chiduza2024atg9bisa pages 1-2) - Directionality/specificity is thought to arise from the combination of ATG2A with WIPI4, ATG9A, VMP1, and TMEM41B, with local ER lipid synthesis proposed to help drive net lipid flow (nguyen2023biochemicalreconstitutionof pages 134-138, chiduza2024atg9bisa pages 1-2) - A 2024 extension of this model proposes that endosomes can also donate PI3P and other lipids to phagophores through ANKFY1-assisted ATG2A transfer (wei2024ankfy1bridgesatg2amediated pages 1-2, wei2024ankfy1bridgesatg2amediated media 2bca71a4) |
| Quantitative/experimental data | - ATG2A is described as a rod-like protein of about ~20 nm length; ATG2A and ATG2B share 44.5% identity (duarte2023theorganizationand pages 4-5) - Purified ATG2A binds/tethers ~30 nm small unilamellar vesicles better than ~100 nm large unilamellar vesicles, consistent with preference for highly curved/packing-defective membranes (wei2024ankfy1bridgesatg2amediated pages 1-2) - In lipid-droplet assays, donor artificial LDs had median diameter ~165 nm (IQR 129–211 nm) and monolayer-containing donors accelerated lipid mixing by at least 4-fold relative to comparable ~100 nm bilayer liposomes; transport-dead ATG2A failed to rescue LD accumulation in knockout cells (korfhage2023atg2amediatedbridgelikelipid pages 1-2) |
| Recent 2023-2024 developments | - 2023 reviews consolidated ATG2A as a central RBG-family bulk lipid transporter/tether in autophagosome biogenesis, integrating structural and biochemical findings into a more unified bridge-transfer model (duarte2023theorganizationand pages 9-10, yamamoto2023autophagygenesin pages 16-17) - 2023 preprint work linked ATG2A bridge-like transport directly to lipid droplet accumulation/homeostasis, expanding its biology beyond phagophore growth (korfhage2023atg2amediatedbridgelikelipid pages 1-2) - 2024 studies added new partners and contexts: ANKFY1 as an endosomal recruiter/promoter of ATG2A-mediated transfer, and ATG9B as a tissue-specific scramblase that can also complex with ATG2A (wei2024ankfy1bridgesatg2amediated pages 1-2, chiduza2024atg9bisa pages 1-2) |
| Disease/physiology links | - ATG2A supports fundamental cellular lipid homeostasis through autophagosome biogenesis and lipid-droplet regulation, so perturbation is expected to impact stress adaptation and metabolism (korfhage2023atg2amediatedbridgelikelipid pages 1-2, yamamoto2023autophagygenesin pages 16-17) - Reviews of ER membrane-contact-site biology and autophagy genes place ATG2-family bridge lipid transport within broader mechanisms relevant to neurodegeneration and human disease, although ATG2A-specific Mendelian disease evidence remains less developed than for some partner proteins (duarte2023theorganizationand pages 13-14, yamamoto2023autophagygenesin pages 16-17) - Loss of ANKFY1 phenocopied ATG2A/B depletion for impaired autophagosome growth and reduced flux, underscoring the physiological importance of ATG2A-mediated membrane supply routes (wei2024ankfy1bridgesatg2amediated pages 1-2) |
| Non-canonical autophagy/lysosome damage | - In 2023, lysosome damage was shown to trigger CASM/non-canonical autophagy-dependent engagement of ATG2, linking ATG2A/B to lysosomal stress responses beyond canonical phagophore expansion (cross2023lysosomedamagetriggers pages 6-7) - In ATG2A/B double-knockout reconstitution experiments, ATG2–LC3 interaction during lysosome damage required the ATG2A LIR rather than the WIPI4-binding region, supporting a distinct ATG8-dependent recruitment mode (cross2023lysosomedamagetriggers pages 6-7) - ATG2A and ATG2B were recovered on damaged lysosomes, and the study proposed a role in lysosome repair alongside other damage-response pathways (cross2023lysosomedamagetriggers pages 6-7) |
Table: This table summarizes the verified identity, molecular function, partners, localization, and recent mechanistic advances for human ATG2A (UniProt Q2TAZ0). It is useful as a compact evidence map linking ATG2A's lipid-transfer role to canonical autophagy, lipid droplet biology, and lysosomal damage responses.
References
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