DRAM1 (DNA damage-regulated autophagy modulator protein 1) is a lysosomal multi-pass membrane protein with six transmembrane segments, primarily localized to LAMP1-positive lysosomes with its C-terminus facing the cytosol. It is a canonical p53-induced autophagy modulator that plays central roles in: (1) promoting autophagosome-lysosome fusion via stabilization of lysosomal VAMP8 by blocking CHIP-mediated ubiquitination, thereby enabling STX17-SNAP29-VAMP8 SNARE complex assembly; (2) regulating ER-lysosome membrane contact sites through interaction with STIM1, affecting calcium homeostasis and ER-phagy; (3) enhancing lysosomal acidification and protease activation; and (4) promoting xenophagy (antimicrobial autophagy) in host defense against intracellular pathogens such as mycobacteria. DRAM1 is transcriptionally activated by p53 and p73, and is down-regulated in tumor cells by methylation-dependent transcriptional silencing. While DRAM1 is best characterized as a positive regulator of autophagy and p53-mediated apoptosis, its precise enzymatic function remains unclear; it appears to act primarily as an adapter/scaffold protein facilitating autophagy machinery assembly and organelle contact site formation.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
| GO:0005764 lysosome | IBA GO_REF:0000033 | ACCEPT | Summary: DRAM1 is a well-established lysosomal membrane protein. The IBA annotation based on phylogenetic analysis is strongly supported by multiple experimental studies showing DRAM1 localization to LAMP1-positive lysosomes (Wang et al., 2024 PNAS; Crighton et al., 2006 Cell PMID:16839881). UniProt also annotates DRAM1 to the lysosomal membrane based on experimental evidence. Reason: Lysosomal localization is a core, well-documented feature of DRAM1. The protein contains 6 transmembrane segments and resides primarily on lysosomes with partial localization to late endosomes and autophagosomes. This is supported by the original discovery paper (PMID:16839881) and recent mechanistic studies. Supporting Evidence: PMID:16839881 Here we describe DRAM (damage-regulated autophagy modulator), a p53 target gene encoding a lysosomal protein that induces macroautophagy file:human/DRAM1/DRAM1-deep-research-falcon.md DRAM1 is a conserved, multi-pass lysosomal membrane protein (six transmembrane segments) whose C-terminus faces the cytosol. It resides primarily on lysosomes with partial localization to late endosomes and autophagosomes. |
| GO:0010506 regulation of autophagy | IBA GO_REF:0000033 | ACCEPT | Summary: DRAM1 is a canonical autophagy modulator, as indicated by its full name "DNA damage-regulated autophagy modulator protein 1". Multiple mechanistic studies confirm DRAM1 regulates autophagy at multiple levels including autophagosome-lysosome fusion (via VAMP8 stabilization) and ER-phagy (via STIM1 interaction). Reason: Regulation of autophagy is the primary, defining function of DRAM1. The IBA annotation accurately captures the core function at the appropriate level of specificity. More specific terms (e.g., positive regulation of autophagosome-lysosome fusion) could be added as additional annotations but this general term correctly describes the overall role. Supporting Evidence: PMID:16839881 Here we describe DRAM (damage-regulated autophagy modulator), a p53 target gene encoding a lysosomal protein that induces macroautophagy file:human/DRAM1/DRAM1-deep-research-falcon.md DRAM1 directly stabilizes VAMP8, enabling STX17-SNAP29-VAMP8 assembly to drive autolysosome formation |
| GO:0005765 lysosomal membrane | IEA GO_REF:0000044 | ACCEPT | Summary: This IEA annotation based on UniProt subcellular location mapping is well-supported. DRAM1 is a multi-pass lysosomal membrane protein with 6 transmembrane helices as annotated in UniProt. Experimental studies confirm the lysosomal membrane localization. Reason: The IEA annotation correctly captures DRAM1's localization to the lysosomal membrane, which is experimentally verified. This is more specific than "lysosome" (GO:0005764) and appropriately indicates the membrane-bound nature of the protein consistent with its 6 transmembrane topology. Supporting Evidence: PMID:16839881 a p53 target gene encoding a lysosomal protein that induces macroautophagy file:human/DRAM1/DRAM1-deep-research-falcon.md DRAM1 is a conserved, multi-pass lysosomal membrane protein (six transmembrane segments) |
| GO:0006914 autophagy | IEA GO_REF:0000043 | ACCEPT | Summary: This IEA annotation based on UniProt keyword mapping is appropriate. DRAM1's involvement in autophagy is central to its function, and while "regulation of autophagy" (GO:0010506) is more specific, this broader term is also accurate. Reason: DRAM1 is directly involved in autophagy processes, particularly at the autophagosome-lysosome fusion step. While the IBA/IDA annotations for "regulation of autophagy" are more informative about DRAM1's regulatory role, this general autophagy annotation is not incorrect as DRAM1 is an integral component of the autophagy machinery. Supporting Evidence: PMID:16839881 a p53 target gene encoding a lysosomal protein that induces macroautophagy |
| GO:0006915 apoptotic process | IEA GO_REF:0000043 | KEEP AS NON CORE | Summary: DRAM1 plays a critical role in p53-mediated apoptosis. The original discovery paper (Crighton et al., 2006) demonstrated that DRAM1 is required for p53-induced apoptosis, linking autophagy to programmed cell death. However, DRAM1 is not directly an apoptotic effector but rather modulates apoptosis through its autophagy regulatory function. Reason: While DRAM1 contributes to p53-mediated apoptosis, this is secondary to its primary autophagy function. The original paper states DRAM1 is essential for p53-mediated apoptosis but this is through its autophagy-modulating activity. DRAM1 can also recruit BAX to lysosomes to trigger lysosomal membrane permeabilization in specific contexts. This annotation is valid but represents a downstream consequence rather than core molecular function. Supporting Evidence: PMID:16839881 while overexpression of DRAM alone causes minimal cell death, DRAM is essential for p53-mediated apoptosis PMID:17304243 p73's ability to induce death, again different to p53, is neither dependent on DRAM nor autophagy |
| GO:0005515 protein binding | IPI PMID:25416956 A proteome-scale map of the human interactome network | MARK AS OVER ANNOTATED | Summary: This annotation derives from a high-throughput yeast two-hybrid study (Rolland et al., 2014, Cell) that identified an interaction between DRAM1 and C1orf21. While technically valid, "protein binding" is uninformative about DRAM1's actual molecular function. Reason: The term "protein binding" is too generic to be informative. DRAM1 has specific, functionally relevant protein interactions (e.g., VAMP8, STIM1) that should be annotated with more specific terms if possible. This high-throughput interaction with C1orf21 lacks functional validation and does not illuminate DRAM1's mechanism. While not incorrect, such generic annotations provide little biological insight. Supporting Evidence: PMID:25416956 A proteome-scale map of the human interactome network. |
| GO:0005515 protein binding | IPI PMID:32296183 A reference map of the human binary protein interactome | MARK AS OVER ANNOTATED | Summary: This annotation derives from the HuRI (Human Reference Interactome) study which identified multiple DRAM1 protein interactions through systematic Y2H screening including GPR42, EVI2B, CLRN1, CD164L2, MS4A7, LRRC4C, and TIMMDC1. Reason: Similar to the other protein binding annotation, this is too generic. The interactions identified in HuRI are from systematic screening without functional validation in the context of DRAM1's autophagy function. The mechanistically relevant interactions (VAMP8, STIM1) are better documented in the specialized literature. Supporting Evidence: PMID:32296183 Apr 8. A reference map of the human binary protein interactome. |
| GO:0090650 cellular response to oxygen-glucose deprivation | IEA GO_REF:0000107 | KEEP AS NON CORE | Summary: This IEA annotation was transferred from orthologous genes via Ensembl Compara. While autophagy is induced by metabolic stress including oxygen-glucose deprivation, and DRAM1 is known to be p53-induced under stress conditions, this specific annotation lacks direct experimental support for human DRAM1. Reason: The annotation is plausible given DRAM1's role as a stress-responsive autophagy modulator that is induced by p53 activation. However, this represents a specific stress context rather than core function. The evidence is transferred from orthologs rather than direct experimental evidence for human DRAM1. |
| GO:0010506 regulation of autophagy | IDA PMID:19895784 Reduced expression of DRAM2/TMEM77 in tumor cells interferes... | ACCEPT | Summary: CRITICAL ISSUE: PMID:19895784 (Park et al., 2009) is primarily about DRAM2/TMEM77, not DRAM1. The paper identifies DRAM2 as a DRAM-homologous protein and studies its lysosomal localization. While the paper mentions that co-expression of DRAM2 with DRAM (DRAM1) induces cell death, the primary focus is on DRAM2. Nevertheless, the annotation itself (regulation of autophagy for DRAM1) is correct based on other literature; this reference is just poorly chosen. Reason: The annotation (regulation of autophagy) is correct for DRAM1 based on extensive literature evidence, even though this particular reference primarily characterizes DRAM2 rather than DRAM1. The core function is well-supported by other studies (PMID:16839881, PMID:17304243). Supporting Evidence: PMID:16839881 Here we describe DRAM (damage-regulated autophagy modulator), a p53 target gene encoding a lysosomal protein that induces macroautophagy PMID:19895784 Reduced expression of DRAM2/TMEM77 in tumor cells interferes with cell death. PMID:17304243 2007 Feb 16. p73 regulates DRAM-independent autophagy that does not contribute to programmed cell death. |
| GO:0005737 cytoplasm | IDA PMID:19895784 Reduced expression of DRAM2/TMEM77 in tumor cells interferes... | REMOVE | Summary: This annotation citing cytoplasmic localization for DRAM1 based on PMID:19895784 is problematic. First, this paper primarily studies DRAM2, not DRAM1. Second, DRAM1 is specifically a lysosomal membrane protein - while the lysosome is within the cytoplasm, annotating DRAM1 to "cytoplasm" is misleading as it is a membrane-bound protein with specific organellar localization. Reason: DRAM1 is a multi-pass transmembrane protein specifically localized to lysosomal membranes, not a cytoplasmic protein. This annotation is overly broad and misleading. The reference (PMID:19895784) primarily characterizes DRAM2, not DRAM1. The more appropriate localization terms (lysosome, lysosomal membrane) are already annotated. Supporting Evidence: file:human/DRAM1/DRAM1-deep-research-falcon.md DRAM1 is a conserved, multi-pass lysosomal membrane protein (six transmembrane segments) whose C-terminus faces the cytosol PMID:19895784 Reduced expression of DRAM2/TMEM77 in tumor cells interferes with cell death. |
| GO:0005764 lysosome | IDA PMID:19895784 Reduced expression of DRAM2/TMEM77 in tumor cells interferes... | ACCEPT | Summary: While the lysosomal localization of DRAM1 is correct and well-supported by other literature (PMID:16839881), this specific reference (PMID:19895784) primarily characterizes DRAM2 rather than DRAM1. The annotation is valid but the reference is suboptimal; PMID:16839881 would be a better primary reference. Reason: Lysosomal localization is a core, well-documented feature of DRAM1 supported by multiple studies. While PMID:19895784 primarily studies DRAM2 and mentions DRAM1 co-localization, better references exist (PMID:16839881). The IDA annotation is retained as the biological assertion is correct. Supporting Evidence: PMID:16839881 a p53 target gene encoding a lysosomal protein that induces macroautophagy PMID:19895784 Reduced expression of DRAM2/TMEM77 in tumor cells interferes with cell death. |
| GO:0160177 positive regulation of autophagosome-lysosome fusion | IDA DOI:10.1038/s41467-025-60887-y | NEW | Summary: Recent mechanistic studies (Zhang et al., 2025 Nature Communications) demonstrate that DRAM1 promotes autophagosome-lysosome fusion by stabilizing lysosomal VAMP8. DRAM1 binds VAMP8 and blocks CHIP-mediated ubiquitination at Lys68/72/75, enabling assembly of the STX17-SNAP29-VAMP8 SNARE complex required for autophagosome-lysosome fusion. Reason: This annotation captures the specific mechanism by which DRAM1 regulates autophagy. While GO:0010506 (regulation of autophagy) is already annotated, this more specific term accurately describes the molecular function revealed by recent research. The evidence is from a 2025 Nature Communications paper with detailed biochemical characterization. Supporting Evidence: file:human/DRAM1/DRAM1-deep-research-falcon.md DRAM1 directly stabilizes VAMP8, enabling STX17-SNAP29-VAMP8 assembly to drive autolysosome formation |
| GO:0000149 SNARE binding | IDA DOI:10.1038/s41467-025-60887-y | NEW | Summary: Zhang et al. (2025) demonstrated that DRAM1 directly binds VAMP8, a SNARE protein (R-SNARE/v-SNARE) on lysosomes. This interaction is essential for DRAM1's function in promoting autophagosome-lysosome fusion. Reason: This MF term captures the specific molecular interaction underlying DRAM1's function. VAMP8 is a well-characterized SNARE protein, and DRAM1 binding to it is mechanistically important for autolysosome formation. This is more informative than generic "protein binding". Supporting Evidence: file:human/DRAM1/DRAM1-deep-research-falcon.md DRAM1 binds and stabilizes lysosomal VAMP8 by blocking CHIP-mediated ubiquitination (Lys68/72/75) |
| GO:1904417 positive regulation of xenophagy | IMP DOI:10.3389/fcimb.2023.1331818 | NEW | Summary: Studies in zebrafish show that dram1 overexpression enhances xenophagy-mediated defense against Mycobacterium marinum infection, increasing LC3 recruitment and acidification of mycobacteria-containing compartments (Xie & Meijer, 2024). Reason: Xenophagy (selective autophagy of intracellular pathogens) is a specific biological role for DRAM1 in host defense. While this evidence is from zebrafish, DRAM1 is conserved and this function is likely relevant to the human protein as well, particularly given the TLR-MYD88-NF-kB regulation pathway. Supporting Evidence: file:human/DRAM1/DRAM1-deep-research-falcon.md dram1 mRNA overexpression increased LC3 colocalization with Mycobacterium marinum and reduced pathogen burden |
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Download this section (compressed HTML)Q: What is the structure of DRAM1 and how does it interact with VAMP8?
Q: Does DRAM1 have any enzymatic activity or is it purely an adapter/scaffold?
Q: How is DRAM1 trafficking from Golgi to lysosomes regulated beyond AP-4?
Q: What determines whether DRAM1 promotes protective autophagy vs apoptosis?
Experiment: Structural studies (cryo-EM or crystallography) of DRAM1-VAMP8 complex
Hypothesis: Determine the molecular basis of DRAM1-VAMP8 interaction
Experiment: Functional studies of DRAM1 in human xenophagy (bacterial infection models)
Hypothesis: Confirm xenophagy function demonstrated in zebrafish also applies to human DRAM1
Experiment: Proximity labeling (BioID/APEX) to identify full DRAM1 interactome at lysosomes
Hypothesis: Identify additional DRAM1 interaction partners at lysosomal membranes
Experiment: CRISPR screens to identify synthetic lethal interactions with DRAM1 in autophagy-dependent cancer
Hypothesis: Identify therapeutic targets that synergize with DRAM1 loss
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