{"gene":"RCHY1","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2016,"finding":"RCHY1 (PIRH2) physically interacts with the SARS-CoV SARS-unique domain (SUD) subdomains 389-652 (SUD-NM) via RCHY1 residues 95-144. Association with SUD increases the stability of RCHY1 and augments RCHY1-mediated ubiquitination and degradation of p53, thereby antagonizing p53-dependent antiviral innate immunity. Similarly, papain-like proteases (PLpro) from SARS-CoV, MERS-CoV, and HCoV-NL63 physically interact with and stabilize RCHY1, triggering degradation of endogenous p53. CAMK2D binds SUD and normally influences RCHY1 stability by phosphorylation, but SUD does not regulate RCHY1 phosphorylation via CAMK2D.","method":"Co-immunoprecipitation, domain-mapping deletion constructs, in vivo ubiquitination assay, p53 degradation assays, phosphorylation analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with domain mapping, functional ubiquitination assays, multiple viral proteins tested, replicated across several coronavirus homologs in a single rigorous study","pmids":["27519799"],"is_preprint":false},{"year":2013,"finding":"Hoxa2 interacts with RCHY1 (PIRH2) and promotes its proteasomal degradation in an ubiquitin-independent manner. Hoxa2 also interacts with 20S proteasome subunits. Hoxa2-mediated RCHY1 degradation alters RCHY1-mediated ubiquitination of p53, leading to p53 stabilization.","method":"Co-immunoprecipitation, ectopic expression/knockdown with protein level readout, ubiquitination assays, proteasome inhibitor experiments","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, ubiquitination assay, and p53 stabilization readout, single lab with two orthogonal methods","pmids":["24244684"],"is_preprint":false},{"year":2015,"finding":"The Hoxa2-mediated degradation of RCHY1 involves both the 19S and 20S proteasome complexes and requires the Hoxa2 homeodomain and C-terminal moiety. The homeodomain is necessary but not sufficient for RCHY1 degradation. All tested Hox proteins interact with RCHY1 via the homeodomain, but only a subset can induce RCHY1 degradation. This interaction and functional consequence is evolutionarily conserved among vertebrates.","method":"Deletion mutagenesis, proteasome complex interaction assays, co-immunoprecipitation with multiple Hox protein variants, cross-species conservation analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-mapping mutagenesis combined with Co-IP and functional degradation assays, single lab","pmids":["26496426"],"is_preprint":false},{"year":2019,"finding":"RCHY1 directly interacts with HDAC2 and negatively regulates HDAC2 protein levels via its E3 ubiquitin ligase RING domain activity. Ectopic expression of wild-type RCHY1 decreased HDAC2 levels in cancer cells regardless of p53 status, while RING-domain mutant RCHY1 did not, and RCHY1 knockdown increased HDAC2 levels.","method":"Co-immunoprecipitation, ectopic expression and knockdown, RING-domain mutant analysis, protein level measurement across p53 wild-type, mutant, and null cell lines","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus catalytic mutant (RING mutant) plus gain/loss-of-function with defined protein-level readout, single lab","pmids":["31630802"],"is_preprint":false},{"year":2024,"finding":"RCHY1 acts as an E3 ubiquitin ligase required for K63-linked ubiquitination of melanosomes. RCHY1 knockdown inhibited melanosome ubiquitination, blocked OPTN translocation to melanosomes (which requires ubiquitin-binding), prevented TBK1 activation and TBK1-mediated S187 OPTN phosphorylation, and abolished melanosome degradation. RCHY1 thus confers cargo selectivity in melanophagy upstream of the OPTN-TBK1 autophagy receptor axis.","method":"siRNA knockdown, K63-linked ubiquitination assay, immunofluorescence localization of OPTN to melanosomes, TBK1 phosphorylation assay, melanosome degradation quantification in B16F10 cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with specific molecular phenotype (K63-ubiquitination, OPTN translocation, TBK1-phosphorylation, melanosome degradation) using multiple orthogonal methods in a single rigorous study","pmids":["38536750"],"is_preprint":false},{"year":2024,"finding":"RCHY1 promotes autophagic flux by facilitating autophagosome-lysosome fusion. Loss of Rchy1 in Drosophila larval midgut cells impaired autophagosome-lysosome fusion and led to accumulation of amphisomes. Depletion of RCHY1 in human HeLa cells also disrupted autophagic flux and reduced autolysosome formation, demonstrating evolutionary conservation of this function.","method":"Genetic screen in Drosophila, loss-of-function (Rchy1 knockdown/knockout), siRNA in HeLa cells, autophagosome-lysosome fusion assay, autophagy flux assays","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in two model systems (Drosophila and human cells) with defined organelle-level phenotype, single lab with orthogonal species validation","pmids":["41986295"],"is_preprint":false},{"year":2022,"finding":"PHB2 (prohibitin 2) upregulates RCHY1, which in turn mediates ubiquitination and degradation of p53 and p21 to promote cell proliferation. DHA downregulates PHB2 in a ubiquitylation-dependent manner and subsequently blocks PHB2-induced RCHY1 upregulation and p53/p21 downregulation. RCHY1 is required for PHB2 to exert its tumor-promoting role.","method":"Overexpression and knockdown of PHB2 and RCHY1, ubiquitination assays, in vitro and in vivo proliferation assays, protein level analysis","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — epistasis via knockdown with defined pathway phenotype (p53/p21 degradation) and functional consequence (proliferation), single lab, multiple methods","pmids":["36342357"],"is_preprint":false},{"year":2026,"finding":"Gorab knockout in mouse dermal fibroblasts impairs RCHY1-mediated ubiquitination of P53, leading to P53 accumulation, increased HDAC2 levels, reduced histone acetylation, and downregulation of extracellular matrix proteins, promoting accelerated skin aging.","method":"Conditional knockout mouse model, protein ubiquitination assay, Western blot for P53/P21/P16/HDAC2/histone acetylation, ECM protein analysis","journal":"Animal models and experimental medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, in vivo knockout model but RCHY1 role is inferred from correlation with P53 ubiquitination changes rather than direct manipulation of RCHY1 in this system","pmids":["41869872"],"is_preprint":false},{"year":2026,"finding":"LINC00839 destabilizes RCHY1 mRNA through recruitment of UPF1, consequently inhibiting RCHY1-mediated ubiquitination and degradation of DJ-1 protein. RCHY1 depletion neutralized the effect of LINC00839 knockdown on ferroptosis, placing RCHY1 downstream of the LINC00839/UPF1 axis as the E3 ligase responsible for DJ-1 ubiquitination and degradation.","method":"LINC00839 and RCHY1 knockdown/overexpression, mRNA stability assays, ubiquitination assay for DJ-1, epistasis by rescue experiments, in vivo tumor growth assay","journal":"NPJ precision oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, epistasis inferred from rescue experiment but RCHY1's direct E3 activity toward DJ-1 not demonstrated by reconstitution or mutagenesis in this abstract","pmids":["42135459"],"is_preprint":false}],"current_model":"RCHY1 (PIRH2) is a RING-type E3 ubiquitin ligase that targets multiple substrates for ubiquitination and proteasomal or autophagic degradation, including p53, HDAC2, and DJ-1; it is stabilized by viral proteins (SARS-CoV SUD, coronaviral PLpro) to augment p53 degradation and thus suppress antiviral innate immunity, is itself degraded via Hoxa2-dependent ubiquitin-independent proteasomal mechanisms, and plays essential roles in selective autophagy by catalyzing K63-linked ubiquitination of melanosomes (enabling melanophagy via OPTN-TBK1) and facilitating autophagosome-lysosome fusion."},"narrative":{"mechanistic_narrative":"RCHY1 (PIRH2) is a RING-domain E3 ubiquitin ligase that controls the abundance of multiple substrate proteins and contributes to selective autophagy [PMID:27519799, PMID:38536750]. Its best-defined catalytic output is the ubiquitination and degradation of p53: this activity is hijacked by coronaviruses, since the SARS-CoV SARS-unique domain (SUD) and the papain-like proteases (PLpro) of SARS-CoV, MERS-CoV and HCoV-NL63 physically bind and stabilize RCHY1, augmenting p53 degradation and thereby antagonizing p53-dependent antiviral innate immunity [PMID:27519799]. Beyond p53, RCHY1 directly binds and downregulates HDAC2 in a RING-domain-dependent manner [PMID:31630802]. In selective autophagy, RCHY1 catalyzes K63-linked ubiquitination of melanosomes to confer cargo selectivity upstream of the OPTN–TBK1 receptor axis, driving melanophagy [PMID:38536750], and it independently promotes autophagic flux by facilitating autophagosome–lysosome fusion, a function conserved from Drosophila to human cells [PMID:41986295]. RCHY1 levels are themselves regulated: Hoxa2 drives its ubiquitin-independent proteasomal degradation through the 19S/20S proteasome, stabilizing p53 [PMID:24244684, PMID:26496426], while PHB2 upregulates RCHY1 to accelerate p53/p21 turnover and proliferation [PMID:36342357].","teleology":[{"year":2013,"claim":"Established that RCHY1 abundance is itself controlled, by identifying Hoxa2 as a factor that degrades RCHY1 and thereby stabilizes p53.","evidence":"Co-IP, knockdown/overexpression with protein-level readout, ubiquitination and proteasome-inhibitor assays","pmids":["24244684"],"confidence":"Medium","gaps":["Mechanism of ubiquitin-independent recognition by the proteasome not resolved","Physiological context where Hoxa2 controls RCHY1 not defined"]},{"year":2015,"claim":"Refined the Hoxa2-RCHY1 degradation mechanism, mapping it to the Hoxa2 homeodomain plus C-terminus and showing engagement of both 19S and 20S proteasome and conservation across vertebrates.","evidence":"Deletion mutagenesis, proteasome complex interaction assays, Co-IP across multiple Hox proteins, cross-species analysis","pmids":["26496426"],"confidence":"Medium","gaps":["Why only a subset of Hox proteins induce degradation despite shared homeodomain binding is unexplained","No structural model of the RCHY1-proteasome interaction"]},{"year":2016,"claim":"Showed that coronaviruses exploit RCHY1 by stabilizing it through SUD and PLpro binding, redirecting its p53-degrading activity to suppress antiviral immunity.","evidence":"Reciprocal Co-IP with domain mapping, in vivo ubiquitination assays, p53 degradation assays across multiple coronavirus homologs","pmids":["27519799"],"confidence":"High","gaps":["Mechanism by which binding increases RCHY1 stability not defined","Role of CAMK2D phosphorylation in physiological RCHY1 regulation left open"]},{"year":2019,"claim":"Expanded RCHY1's substrate repertoire beyond p53 by demonstrating RING-dependent degradation of HDAC2 independent of p53 status.","evidence":"Co-IP, RING-domain mutant analysis, gain/loss-of-function across p53 wild-type, mutant, and null cell lines","pmids":["31630802"],"confidence":"Medium","gaps":["Direct ubiquitin-transfer to HDAC2 not shown by reconstitution","Cellular consequences of HDAC2 loss downstream of RCHY1 not characterized"]},{"year":2022,"claim":"Placed RCHY1 in a tumor-promoting circuit, showing PHB2 upregulates RCHY1 to accelerate p53/p21 turnover and proliferation.","evidence":"PHB2/RCHY1 overexpression and knockdown, ubiquitination assays, proliferation assays in vitro and in vivo","pmids":["36342357"],"confidence":"Medium","gaps":["Mechanism by which PHB2 upregulates RCHY1 not defined","Whether p53 and p21 are direct RCHY1 substrates in this context not demonstrated"]},{"year":2024,"claim":"Defined a non-p53 role for RCHY1 in selective autophagy by showing it K63-ubiquitinates melanosomes to recruit the OPTN-TBK1 receptor axis for melanophagy.","evidence":"siRNA knockdown, K63-ubiquitination assay, OPTN translocation and TBK1 phosphorylation assays, melanosome degradation quantification in B16F10 cells","pmids":["38536750"],"confidence":"High","gaps":["How RCHY1 is targeted specifically to melanosomes is unknown","Direct melanosomal substrate of ubiquitination not identified"]},{"year":2024,"claim":"Demonstrated a conserved RCHY1 function in autophagic flux at the autophagosome-lysosome fusion step, distinct from cargo ubiquitination.","evidence":"Drosophila genetic screen and loss-of-function, siRNA in HeLa, autophagosome-lysosome fusion and autophagy flux assays","pmids":["41986295"],"confidence":"Medium","gaps":["Whether E3 ligase activity is required for fusion not established","Molecular partners at the fusion machinery not identified"]},{"year":2026,"claim":"Linked RCHY1-mediated p53 ubiquitination to skin aging via a Gorab-dependent axis affecting HDAC2 and ECM proteins.","evidence":"Conditional knockout mouse, ubiquitination assay, Western blot for p53/HDAC2/histone acetylation, ECM analysis","pmids":["41869872"],"confidence":"Low","gaps":["RCHY1 role inferred from correlation rather than direct manipulation in this system","Mechanistic connection between Gorab and RCHY1 activity unresolved"]},{"year":2026,"claim":"Proposed DJ-1 as a further RCHY1 substrate within a LINC00839/UPF1 mRNA-stability axis regulating ferroptosis.","evidence":"LINC00839/RCHY1 knockdown and overexpression, mRNA stability assays, DJ-1 ubiquitination assay, rescue epistasis, in vivo tumor growth","pmids":["42135459"],"confidence":"Low","gaps":["Direct E3 activity toward DJ-1 not demonstrated by reconstitution or RING mutagenesis","Whether DJ-1 ubiquitination is K48-linked or degradative not specified"]},{"year":null,"claim":"How a single RING E3 ligase coordinates its degradative substrate functions (p53, HDAC2, DJ-1) with its non-degradative autophagy roles (melanosome K63-ubiquitination, autophagosome-lysosome fusion), and what determines substrate and cargo selectivity, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural basis for RCHY1 substrate/cargo discrimination","Regulation switching RCHY1 between proteasomal and autophagic outputs unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[0,3,4]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,3,4]}],"localization":[],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[4,5]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,3]}],"complexes":[],"partners":["HDAC2","SARS-COV SUD","PLPRO","HOXA2","PHB2","OPTN","P53"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96PM5","full_name":"RING finger and CHY zinc finger domain-containing protein 1","aliases":["Androgen receptor N-terminal-interacting protein","CH-rich-interacting match with PLAG1","E3 ubiquitin-protein ligase Pirh2","RING finger protein 199","RING-type E3 ubiquitin transferase RCHY1","Zinc finger protein 363","p53-induced RING-H2 protein","hPirh2"],"length_aa":261,"mass_kda":30.1,"function":"E3 ubiquitin-protein ligase that mediates ubiquitination of target proteins, including p53/TP53, TP73, HDAC1 and CDKN1B (PubMed:16914734, PubMed:17721809, PubMed:18006823, PubMed:19043414, PubMed:19483087, PubMed:21994467). Mediates ubiquitination and degradation of p53/TP53; preferentially acts on tetrameric p53/TP53 (PubMed:19043414, PubMed:19483087). Catalyzes monoubiquitinates the translesion DNA polymerase POLH (PubMed:21791603). Involved in the ribosome-associated quality control (RQC) pathway, which mediates the extraction of incompletely synthesized nascent chains from stalled ribosomes: RCHY1 acts downstream of NEMF and recognizes CAT tails associated with stalled nascent chains, leading to their ubiquitination and degradation (PubMed:33909987) Has no E3 ubiquitin-protein ligase activity","subcellular_location":"Nucleus; Nucleus speckle; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q96PM5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RCHY1","classification":"Not Classified","n_dependent_lines":9,"n_total_lines":1208,"dependency_fraction":0.0074503311258278145},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RCHY1","total_profiled":1310},"omim":[{"mim_id":"607680","title":"ZINC FINGER PROTEIN 363; ZNF363","url":"https://www.omim.org/entry/607680"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RCHY1"},"hgnc":{"alias_symbol":["CHIMP","DKFZp586C1620","PRO1996","RNF199","ARNIP","PIRH2","ZCHY"],"prev_symbol":["ZNF363"]},"alphafold":{"accession":"Q96PM5","domains":[{"cath_id":"-","chopping":"26-93","consensus_level":"high","plddt":96.825,"start":26,"end":93},{"cath_id":"3.30.40","chopping":"99-178","consensus_level":"high","plddt":93.5645,"start":99,"end":178},{"cath_id":"2.20.28.10","chopping":"192-255","consensus_level":"high","plddt":93.5919,"start":192,"end":255}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96PM5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96PM5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96PM5-F1-predicted_aligned_error_v6.png","plddt_mean":90.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RCHY1","jax_strain_url":"https://www.jax.org/strain/search?query=RCHY1"},"sequence":{"accession":"Q96PM5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96PM5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96PM5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96PM5"}},"corpus_meta":[{"pmid":"14671302","id":"PMC_14671302","title":"Inferring nonneutral evolution from human-chimp-mouse orthologous gene trios.","date":"2003","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/14671302","citation_count":467,"is_preprint":false},{"pmid":"26365491","id":"PMC_26365491","title":"Enhancer divergence and cis-regulatory evolution in the human and chimp neural crest.","date":"2015","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/26365491","citation_count":279,"is_preprint":false},{"pmid":"1512267","id":"PMC_1512267","title":"A new inhibitor of metalloproteinases from chicken: ChIMP-3. 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Association with SUD increases the stability of RCHY1 and augments RCHY1-mediated ubiquitination and degradation of p53, thereby antagonizing p53-dependent antiviral innate immunity. Similarly, papain-like proteases (PLpro) from SARS-CoV, MERS-CoV, and HCoV-NL63 physically interact with and stabilize RCHY1, triggering degradation of endogenous p53. CAMK2D binds SUD and normally influences RCHY1 stability by phosphorylation, but SUD does not regulate RCHY1 phosphorylation via CAMK2D.\",\n      \"method\": \"Co-immunoprecipitation, domain-mapping deletion constructs, in vivo ubiquitination assay, p53 degradation assays, phosphorylation analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with domain mapping, functional ubiquitination assays, multiple viral proteins tested, replicated across several coronavirus homologs in a single rigorous study\",\n      \"pmids\": [\"27519799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Hoxa2 interacts with RCHY1 (PIRH2) and promotes its proteasomal degradation in an ubiquitin-independent manner. Hoxa2 also interacts with 20S proteasome subunits. Hoxa2-mediated RCHY1 degradation alters RCHY1-mediated ubiquitination of p53, leading to p53 stabilization.\",\n      \"method\": \"Co-immunoprecipitation, ectopic expression/knockdown with protein level readout, ubiquitination assays, proteasome inhibitor experiments\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, ubiquitination assay, and p53 stabilization readout, single lab with two orthogonal methods\",\n      \"pmids\": [\"24244684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The Hoxa2-mediated degradation of RCHY1 involves both the 19S and 20S proteasome complexes and requires the Hoxa2 homeodomain and C-terminal moiety. The homeodomain is necessary but not sufficient for RCHY1 degradation. All tested Hox proteins interact with RCHY1 via the homeodomain, but only a subset can induce RCHY1 degradation. This interaction and functional consequence is evolutionarily conserved among vertebrates.\",\n      \"method\": \"Deletion mutagenesis, proteasome complex interaction assays, co-immunoprecipitation with multiple Hox protein variants, cross-species conservation analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-mapping mutagenesis combined with Co-IP and functional degradation assays, single lab\",\n      \"pmids\": [\"26496426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RCHY1 directly interacts with HDAC2 and negatively regulates HDAC2 protein levels via its E3 ubiquitin ligase RING domain activity. Ectopic expression of wild-type RCHY1 decreased HDAC2 levels in cancer cells regardless of p53 status, while RING-domain mutant RCHY1 did not, and RCHY1 knockdown increased HDAC2 levels.\",\n      \"method\": \"Co-immunoprecipitation, ectopic expression and knockdown, RING-domain mutant analysis, protein level measurement across p53 wild-type, mutant, and null cell lines\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus catalytic mutant (RING mutant) plus gain/loss-of-function with defined protein-level readout, single lab\",\n      \"pmids\": [\"31630802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RCHY1 acts as an E3 ubiquitin ligase required for K63-linked ubiquitination of melanosomes. RCHY1 knockdown inhibited melanosome ubiquitination, blocked OPTN translocation to melanosomes (which requires ubiquitin-binding), prevented TBK1 activation and TBK1-mediated S187 OPTN phosphorylation, and abolished melanosome degradation. RCHY1 thus confers cargo selectivity in melanophagy upstream of the OPTN-TBK1 autophagy receptor axis.\",\n      \"method\": \"siRNA knockdown, K63-linked ubiquitination assay, immunofluorescence localization of OPTN to melanosomes, TBK1 phosphorylation assay, melanosome degradation quantification in B16F10 cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with specific molecular phenotype (K63-ubiquitination, OPTN translocation, TBK1-phosphorylation, melanosome degradation) using multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"38536750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RCHY1 promotes autophagic flux by facilitating autophagosome-lysosome fusion. Loss of Rchy1 in Drosophila larval midgut cells impaired autophagosome-lysosome fusion and led to accumulation of amphisomes. Depletion of RCHY1 in human HeLa cells also disrupted autophagic flux and reduced autolysosome formation, demonstrating evolutionary conservation of this function.\",\n      \"method\": \"Genetic screen in Drosophila, loss-of-function (Rchy1 knockdown/knockout), siRNA in HeLa cells, autophagosome-lysosome fusion assay, autophagy flux assays\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in two model systems (Drosophila and human cells) with defined organelle-level phenotype, single lab with orthogonal species validation\",\n      \"pmids\": [\"41986295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PHB2 (prohibitin 2) upregulates RCHY1, which in turn mediates ubiquitination and degradation of p53 and p21 to promote cell proliferation. DHA downregulates PHB2 in a ubiquitylation-dependent manner and subsequently blocks PHB2-induced RCHY1 upregulation and p53/p21 downregulation. RCHY1 is required for PHB2 to exert its tumor-promoting role.\",\n      \"method\": \"Overexpression and knockdown of PHB2 and RCHY1, ubiquitination assays, in vitro and in vivo proliferation assays, protein level analysis\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — epistasis via knockdown with defined pathway phenotype (p53/p21 degradation) and functional consequence (proliferation), single lab, multiple methods\",\n      \"pmids\": [\"36342357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Gorab knockout in mouse dermal fibroblasts impairs RCHY1-mediated ubiquitination of P53, leading to P53 accumulation, increased HDAC2 levels, reduced histone acetylation, and downregulation of extracellular matrix proteins, promoting accelerated skin aging.\",\n      \"method\": \"Conditional knockout mouse model, protein ubiquitination assay, Western blot for P53/P21/P16/HDAC2/histone acetylation, ECM protein analysis\",\n      \"journal\": \"Animal models and experimental medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, in vivo knockout model but RCHY1 role is inferred from correlation with P53 ubiquitination changes rather than direct manipulation of RCHY1 in this system\",\n      \"pmids\": [\"41869872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"LINC00839 destabilizes RCHY1 mRNA through recruitment of UPF1, consequently inhibiting RCHY1-mediated ubiquitination and degradation of DJ-1 protein. RCHY1 depletion neutralized the effect of LINC00839 knockdown on ferroptosis, placing RCHY1 downstream of the LINC00839/UPF1 axis as the E3 ligase responsible for DJ-1 ubiquitination and degradation.\",\n      \"method\": \"LINC00839 and RCHY1 knockdown/overexpression, mRNA stability assays, ubiquitination assay for DJ-1, epistasis by rescue experiments, in vivo tumor growth assay\",\n      \"journal\": \"NPJ precision oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, epistasis inferred from rescue experiment but RCHY1's direct E3 activity toward DJ-1 not demonstrated by reconstitution or mutagenesis in this abstract\",\n      \"pmids\": [\"42135459\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RCHY1 (PIRH2) is a RING-type E3 ubiquitin ligase that targets multiple substrates for ubiquitination and proteasomal or autophagic degradation, including p53, HDAC2, and DJ-1; it is stabilized by viral proteins (SARS-CoV SUD, coronaviral PLpro) to augment p53 degradation and thus suppress antiviral innate immunity, is itself degraded via Hoxa2-dependent ubiquitin-independent proteasomal mechanisms, and plays essential roles in selective autophagy by catalyzing K63-linked ubiquitination of melanosomes (enabling melanophagy via OPTN-TBK1) and facilitating autophagosome-lysosome fusion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RCHY1 (PIRH2) is a RING-domain E3 ubiquitin ligase that controls the abundance of multiple substrate proteins and contributes to selective autophagy [#0, #4]. Its best-defined catalytic output is the ubiquitination and degradation of p53: this activity is hijacked by coronaviruses, since the SARS-CoV SARS-unique domain (SUD) and the papain-like proteases (PLpro) of SARS-CoV, MERS-CoV and HCoV-NL63 physically bind and stabilize RCHY1, augmenting p53 degradation and thereby antagonizing p53-dependent antiviral innate immunity [#0]. Beyond p53, RCHY1 directly binds and downregulates HDAC2 in a RING-domain-dependent manner [#3]. In selective autophagy, RCHY1 catalyzes K63-linked ubiquitination of melanosomes to confer cargo selectivity upstream of the OPTN–TBK1 receptor axis, driving melanophagy [#4], and it independently promotes autophagic flux by facilitating autophagosome–lysosome fusion, a function conserved from Drosophila to human cells [#5]. RCHY1 levels are themselves regulated: Hoxa2 drives its ubiquitin-independent proteasomal degradation through the 19S/20S proteasome, stabilizing p53 [#1, #2], while PHB2 upregulates RCHY1 to accelerate p53/p21 turnover and proliferation [#6].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Established that RCHY1 abundance is itself controlled, by identifying Hoxa2 as a factor that degrades RCHY1 and thereby stabilizes p53.\",\n      \"evidence\": \"Co-IP, knockdown/overexpression with protein-level readout, ubiquitination and proteasome-inhibitor assays\",\n      \"pmids\": [\"24244684\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of ubiquitin-independent recognition by the proteasome not resolved\", \"Physiological context where Hoxa2 controls RCHY1 not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Refined the Hoxa2-RCHY1 degradation mechanism, mapping it to the Hoxa2 homeodomain plus C-terminus and showing engagement of both 19S and 20S proteasome and conservation across vertebrates.\",\n      \"evidence\": \"Deletion mutagenesis, proteasome complex interaction assays, Co-IP across multiple Hox proteins, cross-species analysis\",\n      \"pmids\": [\"26496426\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Why only a subset of Hox proteins induce degradation despite shared homeodomain binding is unexplained\", \"No structural model of the RCHY1-proteasome interaction\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed that coronaviruses exploit RCHY1 by stabilizing it through SUD and PLpro binding, redirecting its p53-degrading activity to suppress antiviral immunity.\",\n      \"evidence\": \"Reciprocal Co-IP with domain mapping, in vivo ubiquitination assays, p53 degradation assays across multiple coronavirus homologs\",\n      \"pmids\": [\"27519799\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which binding increases RCHY1 stability not defined\", \"Role of CAMK2D phosphorylation in physiological RCHY1 regulation left open\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Expanded RCHY1's substrate repertoire beyond p53 by demonstrating RING-dependent degradation of HDAC2 independent of p53 status.\",\n      \"evidence\": \"Co-IP, RING-domain mutant analysis, gain/loss-of-function across p53 wild-type, mutant, and null cell lines\",\n      \"pmids\": [\"31630802\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ubiquitin-transfer to HDAC2 not shown by reconstitution\", \"Cellular consequences of HDAC2 loss downstream of RCHY1 not characterized\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Placed RCHY1 in a tumor-promoting circuit, showing PHB2 upregulates RCHY1 to accelerate p53/p21 turnover and proliferation.\",\n      \"evidence\": \"PHB2/RCHY1 overexpression and knockdown, ubiquitination assays, proliferation assays in vitro and in vivo\",\n      \"pmids\": [\"36342357\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which PHB2 upregulates RCHY1 not defined\", \"Whether p53 and p21 are direct RCHY1 substrates in this context not demonstrated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a non-p53 role for RCHY1 in selective autophagy by showing it K63-ubiquitinates melanosomes to recruit the OPTN-TBK1 receptor axis for melanophagy.\",\n      \"evidence\": \"siRNA knockdown, K63-ubiquitination assay, OPTN translocation and TBK1 phosphorylation assays, melanosome degradation quantification in B16F10 cells\",\n      \"pmids\": [\"38536750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How RCHY1 is targeted specifically to melanosomes is unknown\", \"Direct melanosomal substrate of ubiquitination not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated a conserved RCHY1 function in autophagic flux at the autophagosome-lysosome fusion step, distinct from cargo ubiquitination.\",\n      \"evidence\": \"Drosophila genetic screen and loss-of-function, siRNA in HeLa, autophagosome-lysosome fusion and autophagy flux assays\",\n      \"pmids\": [\"41986295\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether E3 ligase activity is required for fusion not established\", \"Molecular partners at the fusion machinery not identified\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Linked RCHY1-mediated p53 ubiquitination to skin aging via a Gorab-dependent axis affecting HDAC2 and ECM proteins.\",\n      \"evidence\": \"Conditional knockout mouse, ubiquitination assay, Western blot for p53/HDAC2/histone acetylation, ECM analysis\",\n      \"pmids\": [\"41869872\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"RCHY1 role inferred from correlation rather than direct manipulation in this system\", \"Mechanistic connection between Gorab and RCHY1 activity unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Proposed DJ-1 as a further RCHY1 substrate within a LINC00839/UPF1 mRNA-stability axis regulating ferroptosis.\",\n      \"evidence\": \"LINC00839/RCHY1 knockdown and overexpression, mRNA stability assays, DJ-1 ubiquitination assay, rescue epistasis, in vivo tumor growth\",\n      \"pmids\": [\"42135459\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Direct E3 activity toward DJ-1 not demonstrated by reconstitution or RING mutagenesis\", \"Whether DJ-1 ubiquitination is K48-linked or degradative not specified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single RING E3 ligase coordinates its degradative substrate functions (p53, HDAC2, DJ-1) with its non-degradative autophagy roles (melanosome K63-ubiquitination, autophagosome-lysosome fusion), and what determines substrate and cargo selectivity, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural basis for RCHY1 substrate/cargo discrimination\", \"Regulation switching RCHY1 between proteasomal and autophagic outputs unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [0, 3, 4]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 3, 4]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"HDAC2\", \"SARS-CoV SUD\", \"PLpro\", \"Hoxa2\", \"PHB2\", \"OPTN\", \"p53\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}