{"gene":"SPCS1","run_date":"2026-06-10T07:46:39","timeline":{"discoveries":[{"year":1996,"finding":"Spc1p (yeast homolog of mammalian SPC12/SPCS1) co-purifies with the essential signal peptidase subunit Sec11p and genetically interacts with it; Spc1p is not required for cell growth or proteolytic processing of tested proteins but is important for efficient signal peptidase activity. A high-copy plasmid encoding Spc1p suppresses the conditional sec11 mutation, whereas Spc2p does not.","method":"Genetic epistasis (synthetic lethality, high-copy suppression of sec11 conditional mutant), co-purification biochemistry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic and biochemical evidence replicated across two independent studies (PMID:8663399 and PMID:8910564) using co-purification and multiple genetic epistasis experiments","pmids":["8663399","8910564"],"is_preprint":false},{"year":1996,"finding":"Spc1p (SPCS1 yeast homolog) and Spc2p are both non-essential for signal peptidase activity individually; null mutations in each are synthetically lethal with a conditional sec11 mutation; however, they are functionally distinct — Spc1p (but not Spc2p) suppresses sec11 in high copy, while Spc2p (but not Spc1p) is required for signal peptidase activity at high temperatures. A double spc1Δ spc2Δ mutant grows well, indicating the signal peptidase complex missing both subunits retains activity in vivo.","method":"Yeast genetics (null mutants, synthetic lethality, high-copy suppression, temperature-sensitive growth assays)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal genetic methods in a focused study, replicated genetic interaction with Sec11p","pmids":["8910564"],"is_preprint":false},{"year":2013,"finding":"SPCS1 interacts with HCV NS2 and E2; a trimeric complex of NS2, E2, and SPCS1 was detected by co-immunoprecipitation. Knockdown of SPCS1 reduced infectious HCV production and impaired the NS2–E2 interaction, but did not affect structural protein processing, cell entry, RNA replication, or virus release. This places SPCS1 as required for formation of the membrane-associated NS2–E2 assembly complex.","method":"Split-ubiquitin membrane yeast two-hybrid screen, siRNA knockdown, co-immunoprecipitation","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and functional KD with specific phenotypic readout, single lab","pmids":["24009510"],"is_preprint":false},{"year":2016,"finding":"SPCS1 is specifically required for proper cleavage of flavivirus structural proteins (prM and E) and secretion of viral particles; loss of SPCS1 markedly reduces yield of all Flaviviridae tested (WNV, DENV, ZIKV, YFV, JEV, HCV) but does not impair alphavirus, bunyavirus, or rhabdovirus infection, nor surface expression or secretion of diverse host proteins. SPCS1 dependence is bypassed by replacing the native prM leader with a class I MHC antigen leader, indicating SPCS1 preferentially promotes processing of specific signal peptide cargo.","method":"Genome-wide CRISPR/Cas9 screen, genetic validation by KO, rescue with MHC leader sequence replacement, viral yield assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide unbiased screen followed by targeted validation with multiple orthogonal experiments including genetic rescue, replicated across multiple viral species","pmids":["27383988"],"is_preprint":false},{"year":2018,"finding":"SPCS1 interacts with JEV NS2B via two transmembrane domains of NS2B [NS2B(1-49) and NS2B(84-131)]; SPCS1 residues 91-169 (containing two transmembrane domains) mediate these interactions. Loss of SPCS1 impairs intracellular virion assembly and infectious JEV particle production but does not affect cell entry, RNA replication, or translation. Point mutations G12A, G37A, G47A in NS2B(1-49) and P112A in NS2B(84-131) weaken the SPCS1 interaction.","method":"siRNA knockdown, CRISPR knockout, co-immunoprecipitation, serial deletion and point mutagenesis","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with deletion and point mutagenesis mapping, KD and KO with specific phenotypic readouts, single lab with multiple orthogonal methods","pmids":["29593046"],"is_preprint":false},{"year":2021,"finding":"Yeast Spc1 (SPCS1 homolog) negatively regulates signal peptidase-mediated processing of membrane proteins: loss of Spc1 enhances SPase cleavage of signal-anchored and transmembrane segments, while Spc1 overexpression reduces this processing. Spc1 co-immunoprecipitates with proteins carrying uncleaved signal-anchored or transmembrane segments, suggesting it protects TM segments from SPase action to sharpen substrate selection.","method":"In vivo SPase cleavage assay with modified signal sequences, deletion strains, overexpression, co-immunoprecipitation","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (functional cleavage assay, Co-IP, gain- and loss-of-function genetics) in a single focused study","pmids":["34125229"],"is_preprint":false},{"year":2021,"finding":"SPCS1 is an essential Zika virus host factor in placental trophoblasts; CRISPR/Cas9 screen identified SPCS1 among ER membrane complex and signal peptide processing pathway factors required for ZIKV replication in this cell type.","method":"Pooled CRISPR/Cas9 screen in trophoblasts, validated SPCS1 KO","journal":"Virus research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — CRISPR screen with validation KO, single lab, limited mechanistic detail in abstract","pmids":["33577859"],"is_preprint":false},{"year":2022,"finding":"Loss of SPCS1 specifically impairs SPC-mediated processing of the HCV E2-p7 junction (but not other SPC cleavage sites in the HCV polyprotein). Efficient E2-p7 separation, regardless of dependence on SPC processing, renders SPCS1 dispensable for HCV assembly. Structural modeling and MD simulations indicate that the structural rigidity of p7 N-terminal TM helix-1 causes intrinsically delayed E2-p7 processing, and SPCS1 facilitates this cleavage by enhancing presentation of the E2-p7 junction to the SPC active site.","method":"SPCS1 knockout/knockdown, SPC cleavage site mutagenesis, structural modeling, molecular dynamics simulations, viral infectivity assays","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with specific cleavage site readout and structural modeling; mechanistic model supported by two orthogonal approaches but structural data is computational, single lab","pmids":["35130329"],"is_preprint":false},{"year":2025,"finding":"SPCS1 interacts with rotavirus outer capsid protein VP7 (VP7 residue E256 identified as key binding site; E256R mutation abolishes interaction and reduces viral infectivity). Loss of SPCS1 leads to inefficient cleavage of the VP7 signal peptide, formation of abnormal viral particles by TEM, and severely impaired virion maturation and assembly, without affecting viral transcription, translation, or replication.","method":"Tandem affinity purification–mass spectrometry, CRISPR knockout, siRNA knockdown, site-directed mutagenesis (E256R), transmission electron microscopy, VP7 signal peptide cleavage assay","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — affinity purification–MS, mutagenesis identifying specific binding residue, KO with TEM ultrastructural readout and biochemical signal peptide cleavage assay, published peer-reviewed","pmids":["41860932"],"is_preprint":false},{"year":2025,"finding":"SPCS1 mediates upregulation of HPV entry receptors CD151 and HSPG2 in keratinocytes downstream of T. vaginalis adhesion protein TvAP65; siRNA knockdown of SPCS1 alone reduced HPV infection by ~34% and abolished T. vaginalis-driven CD151/HSPG2 upregulation, defining a TvAP65–SPCS1–CD151/HSPG2 axis.","method":"siRNA screen of 12 TvAP65-interacting host molecules, siRNA knockdown of SPCS1, dual knockdown epistasis, HPV infection quantification, receptor expression measurement","journal":"Infectious diseases of poverty","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — siRNA knockdown with specific phenotypic readouts and epistasis, single lab, mechanism of SPCS1 action on CD151/HSPG2 not fully resolved at molecular level","pmids":["41199321"],"is_preprint":false}],"current_model":"SPCS1 (SPC12) is a non-catalytic transmembrane subunit of the ER signal peptidase complex that acts as a specificity/selectivity factor: it protects transmembrane segments from inadvertent signal peptidase cleavage (sharpening substrate selection), and is selectively required for efficient SPC-mediated processing of suboptimal signal peptide substrates — a property exploited by Flaviviridae and other ER-replicating viruses (flaviviruses, HCV, rotavirus) whose structural glycoprotein precursors depend on SPCS1 for proper cleavage, virion assembly, and infectivity, while broad host protein secretion is unaffected by its loss."},"narrative":{"mechanistic_narrative":"SPCS1 (yeast Spc1p/mammalian SPC12) is a non-catalytic transmembrane subunit of the ER signal peptidase complex (SPC) that acts as a substrate-selectivity factor rather than a catalytic component [PMID:8663399, PMID:8910564]. In yeast, Spc1p co-purifies and genetically interacts with the essential catalytic subunit Sec11p and is dispensable for bulk signal-peptide processing and growth, yet it is required for efficient signal peptidase activity, and a double spc1Δ spc2Δ complex retains activity in vivo [PMID:8663399, PMID:8910564]. Mechanistically, SPCS1 sharpens SPC substrate selection: it associates with proteins bearing uncleaved signal-anchored or transmembrane segments and protects those TM segments from inadvertent SPase cleavage, with loss of Spc1 enhancing and overexpression suppressing such cleavage [PMID:34125229]. This selectivity is exploited by ER-replicating viruses whose suboptimal signal-peptide cargo depends on SPCS1 for proper processing: SPCS1 is selectively required for cleavage of flavivirus prM/E structural proteins and for Flaviviridae particle production (WNV, DENV, ZIKV, YFV, JEV, HCV), while host protein secretion and unrelated viruses are unaffected, and this dependence is bypassed by swapping the native prM leader for an MHC class I leader [PMID:27383988]. SPCS1 engages viral membrane proteins directly—flavivirus NS2B via paired transmembrane domains [PMID:29593046], HCV NS2/E2 in a trimeric assembly complex [PMID:24009510], and the HCV E2-p7 junction whose intrinsically delayed cleavage SPCS1 facilitates [PMID:35130329]—so that its loss impairs intracellular virion assembly without affecting entry, RNA replication, or translation [PMID:29593046, PMID:35130329]. The same processing role extends beyond Flaviviridae: SPCS1 binds rotavirus VP7 (via residue E256) and is required for VP7 signal-peptide cleavage and normal virion maturation [PMID:41860932].","teleology":[{"year":1996,"claim":"Established that the SPCS1 homolog is a genuine, physically associated subunit of the signal peptidase complex that tunes its activity rather than performing essential catalysis, distinguishing accessory from catalytic SPC components.","evidence":"Co-purification with Sec11p plus genetic epistasis (synthetic lethality, high-copy suppression of a sec11 conditional mutant) in yeast","pmids":["8663399","8910564"],"confidence":"High","gaps":["Did not define the molecular basis of how Spc1p enhances SPase efficiency","Mammalian SPCS1 function inferred only by homology at this stage"]},{"year":1996,"claim":"Resolved that the two accessory SPC subunits are functionally distinct and individually dispensable, showing the complex retains activity without either while each contributes separately to SPase performance.","evidence":"Yeast null mutants, synthetic lethality, high-copy suppression, and temperature-sensitive growth assays","pmids":["8910564"],"confidence":"High","gaps":["Specific substrates whose processing depends on Spc1p not identified","No structural account of subunit contributions"]},{"year":2013,"claim":"First mechanistic link of mammalian SPCS1 to viral assembly, showing it is needed to build a membrane-associated NS2-E2 assembly complex rather than for polyprotein cleavage per se.","evidence":"Split-ubiquitin membrane yeast two-hybrid, siRNA knockdown, and reciprocal co-immunoprecipitation in HCV","pmids":["24009510"],"confidence":"Medium","gaps":["Single lab","Did not reconcile assembly role with later signal-peptide processing model","Structural basis of the trimeric complex unresolved"]},{"year":2016,"claim":"Defined SPCS1 as a selective host factor that promotes processing of specific suboptimal signal-peptide cargo, explaining pan-Flaviviridae dependence while host secretion is spared.","evidence":"Genome-wide CRISPR/Cas9 screen with KO validation and genetic rescue by MHC leader replacement across multiple viral species","pmids":["27383988"],"confidence":"High","gaps":["Did not define the signal-sequence features that confer SPCS1 dependence at residue level","Direct biochemical demonstration of altered SPC cleavage on prM not shown"]},{"year":2018,"claim":"Mapped a direct transmembrane-domain-mediated interaction between SPCS1 and flavivirus NS2B and tied it to intracellular virion assembly, localizing SPCS1's contribution to a discrete assembly step.","evidence":"Co-IP with serial deletion and point mutagenesis (NS2B and SPCS1 TM domains) plus siRNA/CRISPR with replication and assembly readouts in JEV","pmids":["29593046"],"confidence":"High","gaps":["Relationship between NS2B binding and signal-peptide processing role not integrated","Structural model of the SPCS1-NS2B interface absent"]},{"year":2021,"claim":"Established the native cellular function: SPCS1 negatively regulates SPase cleavage of transmembrane segments, protecting TM helices from inadvertent processing to sharpen substrate selection.","evidence":"In vivo SPase cleavage assays with modified signal sequences, deletion and overexpression strains, and co-IP with uncleaved TM-bearing substrates in yeast","pmids":["34125229"],"confidence":"High","gaps":["Whether mammalian SPCS1 protects TM segments by the same mechanism not directly tested","No structural picture of how SPCS1 occludes TM substrates from the active site"]},{"year":2021,"claim":"Extended SPCS1 dependence to ZIKV replication in a physiologically relevant placental trophoblast context, supporting its general role across flavivirus tropisms.","evidence":"Pooled CRISPR/Cas9 screen in trophoblasts with SPCS1 KO validation","pmids":["33577859"],"confidence":"Medium","gaps":["Limited mechanistic detail","Cell-type-specific contribution not dissected"]},{"year":2022,"claim":"Pinpointed the molecular reason for SPCS1 dependence in HCV: it facilitates cleavage of the intrinsically delayed E2-p7 junction by enhancing its presentation to the SPC active site.","evidence":"SPCS1 KO/KD with site-specific cleavage readouts, plus structural modeling and molecular dynamics simulations of the p7 TM helix","pmids":["35130329"],"confidence":"Medium","gaps":["Structural evidence is computational, not experimental","Single lab","Generalizability of the 'presentation' model to other substrates untested"]},{"year":2025,"claim":"Showed SPCS1's signal-peptide processing role extends beyond Flaviviridae, mediating rotavirus VP7 signal-peptide cleavage and proper virion maturation via a defined VP7 contact residue.","evidence":"TAP-MS, CRISPR KO/siRNA, VP7 E256R mutagenesis, TEM ultrastructure, and VP7 signal-peptide cleavage assay","pmids":["41860932"],"confidence":"High","gaps":["How a single VP7 residue couples to SPCS1-dependent cleavage not structurally resolved","Breadth across other non-flavivirus signal-peptide substrates unknown"]},{"year":2025,"claim":"Implicated SPCS1 in a receptor-upregulation axis promoting HPV entry downstream of T. vaginalis adhesion, hinting at a role beyond direct signal-peptide processing.","evidence":"siRNA knockdown, dual-knockdown epistasis, HPV infection quantification, and receptor expression measurement in keratinocytes","pmids":["41199321"],"confidence":"Medium","gaps":["Molecular mechanism by which SPCS1 controls CD151/HSPG2 expression unresolved","Single lab","Connection to canonical SPC processing function unclear"]},{"year":null,"claim":"An experimental high-resolution structure of human SPCS1 within the assembled SPC and a definition of the signal-peptide sequence determinants that render a substrate SPCS1-dependent remain open.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No experimental structure of SPCS1 in the SPC","Sequence/biophysical rules of SPCS1-dependent cargo undefined","Any catalytic-independent function (e.g., receptor regulation) not mechanistically explained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,5]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[5,7,8]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,5]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,5]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,4,8]}],"complexes":["signal peptidase complex (SPC)"],"partners":["SEC11","NS2","E2","NS2B","VP7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y6A9","full_name":"Signal peptidase complex subunit 1","aliases":["Microsomal signal peptidase 12 kDa subunit","SPase 12 kDa subunit"],"length_aa":169,"mass_kda":18.3,"function":"Component of the signal peptidase complex (SPC) which catalyzes the cleavage of N-terminal signal sequences from nascent proteins as they are translocated into the lumen of the endoplasmic reticulum (PubMed:34388369). Dispensable for SPC enzymatic activity (By similarity) (Microbial infection) Required for the post-translational processing of proteins involved in virion assembly and secretion from flaviviruses such as West Nile virus (WNV), Japanese encephalitis virus (JEV), Dengue virus type 2 (DENV-2), Yellow Fever virus (YFV), Zika virus (ZIKV) and hepatitis C virus (HCV) (PubMed:24009510, PubMed:27383988, PubMed:29593046). Plays a key role in the post-translational processing of flaviviral structural proteins prM, E, and NS1 (PubMed:27383988, PubMed:29593046). In HCV, it is involved in virion assembly where it promotes the interaction between HCV virus proteins NS2 and E2 (PubMed:24009510)","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q9Y6A9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SPCS1","classification":"Not Classified","n_dependent_lines":102,"n_total_lines":1208,"dependency_fraction":0.08443708609271523},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CANX","stoichiometry":0.2},{"gene":"COPE","stoichiometry":0.2},{"gene":"VAPA","stoichiometry":0.2},{"gene":"CCDC47","stoichiometry":0.2},{"gene":"NCLN","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SPCS1","total_profiled":1310},"omim":[{"mim_id":"618854","title":"SIGNAL PEPTIDASE COMPLEX, SUBUNIT 3; SPCS3","url":"https://www.omim.org/entry/618854"},{"mim_id":"610358","title":"SIGNAL PEPTIDASE COMPLEX, SUBUNIT 1; SPCS1","url":"https://www.omim.org/entry/610358"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SPCS1"},"hgnc":{"alias_symbol":["SPC12","HSPC033","YJR010C-A","SPC1"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y6A9","domains":[{"cath_id":"1.10.287","chopping":"80-138","consensus_level":"high","plddt":86.3556,"start":80,"end":138}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6A9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6A9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y6A9-F1-predicted_aligned_error_v6.png","plddt_mean":63.91},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SPCS1","jax_strain_url":"https://www.jax.org/strain/search?query=SPCS1"},"sequence":{"accession":"Q9Y6A9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y6A9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y6A9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y6A9"}},"corpus_meta":[{"pmid":"27383988","id":"PMC_27383988","title":"A CRISPR 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<i>Trichomonas vaginalis</i>  Promotes HPV Infection by Interacting with Host Molecules","date":"2024-09-27","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.27.615334","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":15342,"output_tokens":2919,"usd":0.044906,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10265,"output_tokens":3600,"usd":0.070663,"stage2_stop_reason":"end_turn"},"total_usd":0.115569,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"Spc1p (yeast homolog of mammalian SPC12/SPCS1) co-purifies with the essential signal peptidase subunit Sec11p and genetically interacts with it; Spc1p is not required for cell growth or proteolytic processing of tested proteins but is important for efficient signal peptidase activity. A high-copy plasmid encoding Spc1p suppresses the conditional sec11 mutation, whereas Spc2p does not.\",\n      \"method\": \"Genetic epistasis (synthetic lethality, high-copy suppression of sec11 conditional mutant), co-purification biochemistry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic and biochemical evidence replicated across two independent studies (PMID:8663399 and PMID:8910564) using co-purification and multiple genetic epistasis experiments\",\n      \"pmids\": [\"8663399\", \"8910564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Spc1p (SPCS1 yeast homolog) and Spc2p are both non-essential for signal peptidase activity individually; null mutations in each are synthetically lethal with a conditional sec11 mutation; however, they are functionally distinct — Spc1p (but not Spc2p) suppresses sec11 in high copy, while Spc2p (but not Spc1p) is required for signal peptidase activity at high temperatures. A double spc1Δ spc2Δ mutant grows well, indicating the signal peptidase complex missing both subunits retains activity in vivo.\",\n      \"method\": \"Yeast genetics (null mutants, synthetic lethality, high-copy suppression, temperature-sensitive growth assays)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal genetic methods in a focused study, replicated genetic interaction with Sec11p\",\n      \"pmids\": [\"8910564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SPCS1 interacts with HCV NS2 and E2; a trimeric complex of NS2, E2, and SPCS1 was detected by co-immunoprecipitation. Knockdown of SPCS1 reduced infectious HCV production and impaired the NS2–E2 interaction, but did not affect structural protein processing, cell entry, RNA replication, or virus release. This places SPCS1 as required for formation of the membrane-associated NS2–E2 assembly complex.\",\n      \"method\": \"Split-ubiquitin membrane yeast two-hybrid screen, siRNA knockdown, co-immunoprecipitation\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and functional KD with specific phenotypic readout, single lab\",\n      \"pmids\": [\"24009510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SPCS1 is specifically required for proper cleavage of flavivirus structural proteins (prM and E) and secretion of viral particles; loss of SPCS1 markedly reduces yield of all Flaviviridae tested (WNV, DENV, ZIKV, YFV, JEV, HCV) but does not impair alphavirus, bunyavirus, or rhabdovirus infection, nor surface expression or secretion of diverse host proteins. SPCS1 dependence is bypassed by replacing the native prM leader with a class I MHC antigen leader, indicating SPCS1 preferentially promotes processing of specific signal peptide cargo.\",\n      \"method\": \"Genome-wide CRISPR/Cas9 screen, genetic validation by KO, rescue with MHC leader sequence replacement, viral yield assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide unbiased screen followed by targeted validation with multiple orthogonal experiments including genetic rescue, replicated across multiple viral species\",\n      \"pmids\": [\"27383988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SPCS1 interacts with JEV NS2B via two transmembrane domains of NS2B [NS2B(1-49) and NS2B(84-131)]; SPCS1 residues 91-169 (containing two transmembrane domains) mediate these interactions. Loss of SPCS1 impairs intracellular virion assembly and infectious JEV particle production but does not affect cell entry, RNA replication, or translation. Point mutations G12A, G37A, G47A in NS2B(1-49) and P112A in NS2B(84-131) weaken the SPCS1 interaction.\",\n      \"method\": \"siRNA knockdown, CRISPR knockout, co-immunoprecipitation, serial deletion and point mutagenesis\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with deletion and point mutagenesis mapping, KD and KO with specific phenotypic readouts, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"29593046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Yeast Spc1 (SPCS1 homolog) negatively regulates signal peptidase-mediated processing of membrane proteins: loss of Spc1 enhances SPase cleavage of signal-anchored and transmembrane segments, while Spc1 overexpression reduces this processing. Spc1 co-immunoprecipitates with proteins carrying uncleaved signal-anchored or transmembrane segments, suggesting it protects TM segments from SPase action to sharpen substrate selection.\",\n      \"method\": \"In vivo SPase cleavage assay with modified signal sequences, deletion strains, overexpression, co-immunoprecipitation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (functional cleavage assay, Co-IP, gain- and loss-of-function genetics) in a single focused study\",\n      \"pmids\": [\"34125229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SPCS1 is an essential Zika virus host factor in placental trophoblasts; CRISPR/Cas9 screen identified SPCS1 among ER membrane complex and signal peptide processing pathway factors required for ZIKV replication in this cell type.\",\n      \"method\": \"Pooled CRISPR/Cas9 screen in trophoblasts, validated SPCS1 KO\",\n      \"journal\": \"Virus research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — CRISPR screen with validation KO, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"33577859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of SPCS1 specifically impairs SPC-mediated processing of the HCV E2-p7 junction (but not other SPC cleavage sites in the HCV polyprotein). Efficient E2-p7 separation, regardless of dependence on SPC processing, renders SPCS1 dispensable for HCV assembly. Structural modeling and MD simulations indicate that the structural rigidity of p7 N-terminal TM helix-1 causes intrinsically delayed E2-p7 processing, and SPCS1 facilitates this cleavage by enhancing presentation of the E2-p7 junction to the SPC active site.\",\n      \"method\": \"SPCS1 knockout/knockdown, SPC cleavage site mutagenesis, structural modeling, molecular dynamics simulations, viral infectivity assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with specific cleavage site readout and structural modeling; mechanistic model supported by two orthogonal approaches but structural data is computational, single lab\",\n      \"pmids\": [\"35130329\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SPCS1 interacts with rotavirus outer capsid protein VP7 (VP7 residue E256 identified as key binding site; E256R mutation abolishes interaction and reduces viral infectivity). Loss of SPCS1 leads to inefficient cleavage of the VP7 signal peptide, formation of abnormal viral particles by TEM, and severely impaired virion maturation and assembly, without affecting viral transcription, translation, or replication.\",\n      \"method\": \"Tandem affinity purification–mass spectrometry, CRISPR knockout, siRNA knockdown, site-directed mutagenesis (E256R), transmission electron microscopy, VP7 signal peptide cleavage assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — affinity purification–MS, mutagenesis identifying specific binding residue, KO with TEM ultrastructural readout and biochemical signal peptide cleavage assay, published peer-reviewed\",\n      \"pmids\": [\"41860932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SPCS1 mediates upregulation of HPV entry receptors CD151 and HSPG2 in keratinocytes downstream of T. vaginalis adhesion protein TvAP65; siRNA knockdown of SPCS1 alone reduced HPV infection by ~34% and abolished T. vaginalis-driven CD151/HSPG2 upregulation, defining a TvAP65–SPCS1–CD151/HSPG2 axis.\",\n      \"method\": \"siRNA screen of 12 TvAP65-interacting host molecules, siRNA knockdown of SPCS1, dual knockdown epistasis, HPV infection quantification, receptor expression measurement\",\n      \"journal\": \"Infectious diseases of poverty\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — siRNA knockdown with specific phenotypic readouts and epistasis, single lab, mechanism of SPCS1 action on CD151/HSPG2 not fully resolved at molecular level\",\n      \"pmids\": [\"41199321\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SPCS1 (SPC12) is a non-catalytic transmembrane subunit of the ER signal peptidase complex that acts as a specificity/selectivity factor: it protects transmembrane segments from inadvertent signal peptidase cleavage (sharpening substrate selection), and is selectively required for efficient SPC-mediated processing of suboptimal signal peptide substrates — a property exploited by Flaviviridae and other ER-replicating viruses (flaviviruses, HCV, rotavirus) whose structural glycoprotein precursors depend on SPCS1 for proper cleavage, virion assembly, and infectivity, while broad host protein secretion is unaffected by its loss.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SPCS1 (yeast Spc1p/mammalian SPC12) is a non-catalytic transmembrane subunit of the ER signal peptidase complex (SPC) that acts as a substrate-selectivity factor rather than a catalytic component [#0, #1]. In yeast, Spc1p co-purifies and genetically interacts with the essential catalytic subunit Sec11p and is dispensable for bulk signal-peptide processing and growth, yet it is required for efficient signal peptidase activity, and a double spc1\\u0394 spc2\\u0394 complex retains activity in vivo [#0, #1]. Mechanistically, SPCS1 sharpens SPC substrate selection: it associates with proteins bearing uncleaved signal-anchored or transmembrane segments and protects those TM segments from inadvertent SPase cleavage, with loss of Spc1 enhancing and overexpression suppressing such cleavage [#5]. This selectivity is exploited by ER-replicating viruses whose suboptimal signal-peptide cargo depends on SPCS1 for proper processing: SPCS1 is selectively required for cleavage of flavivirus prM/E structural proteins and for Flaviviridae particle production (WNV, DENV, ZIKV, YFV, JEV, HCV), while host protein secretion and unrelated viruses are unaffected, and this dependence is bypassed by swapping the native prM leader for an MHC class I leader [#3]. SPCS1 engages viral membrane proteins directly\\u2014flavivirus NS2B via paired transmembrane domains [#4], HCV NS2/E2 in a trimeric assembly complex [#2], and the HCV E2-p7 junction whose intrinsically delayed cleavage SPCS1 facilitates [#7]\\u2014so that its loss impairs intracellular virion assembly without affecting entry, RNA replication, or translation [#4, #7]. The same processing role extends beyond Flaviviridae: SPCS1 binds rotavirus VP7 (via residue E256) and is required for VP7 signal-peptide cleavage and normal virion maturation [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established that the SPCS1 homolog is a genuine, physically associated subunit of the signal peptidase complex that tunes its activity rather than performing essential catalysis, distinguishing accessory from catalytic SPC components.\",\n      \"evidence\": \"Co-purification with Sec11p plus genetic epistasis (synthetic lethality, high-copy suppression of a sec11 conditional mutant) in yeast\",\n      \"pmids\": [\"8663399\", \"8910564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular basis of how Spc1p enhances SPase efficiency\", \"Mammalian SPCS1 function inferred only by homology at this stage\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Resolved that the two accessory SPC subunits are functionally distinct and individually dispensable, showing the complex retains activity without either while each contributes separately to SPase performance.\",\n      \"evidence\": \"Yeast null mutants, synthetic lethality, high-copy suppression, and temperature-sensitive growth assays\",\n      \"pmids\": [\"8910564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific substrates whose processing depends on Spc1p not identified\", \"No structural account of subunit contributions\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"First mechanistic link of mammalian SPCS1 to viral assembly, showing it is needed to build a membrane-associated NS2-E2 assembly complex rather than for polyprotein cleavage per se.\",\n      \"evidence\": \"Split-ubiquitin membrane yeast two-hybrid, siRNA knockdown, and reciprocal co-immunoprecipitation in HCV\",\n      \"pmids\": [\"24009510\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Did not reconcile assembly role with later signal-peptide processing model\", \"Structural basis of the trimeric complex unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined SPCS1 as a selective host factor that promotes processing of specific suboptimal signal-peptide cargo, explaining pan-Flaviviridae dependence while host secretion is spared.\",\n      \"evidence\": \"Genome-wide CRISPR/Cas9 screen with KO validation and genetic rescue by MHC leader replacement across multiple viral species\",\n      \"pmids\": [\"27383988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the signal-sequence features that confer SPCS1 dependence at residue level\", \"Direct biochemical demonstration of altered SPC cleavage on prM not shown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Mapped a direct transmembrane-domain-mediated interaction between SPCS1 and flavivirus NS2B and tied it to intracellular virion assembly, localizing SPCS1's contribution to a discrete assembly step.\",\n      \"evidence\": \"Co-IP with serial deletion and point mutagenesis (NS2B and SPCS1 TM domains) plus siRNA/CRISPR with replication and assembly readouts in JEV\",\n      \"pmids\": [\"29593046\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between NS2B binding and signal-peptide processing role not integrated\", \"Structural model of the SPCS1-NS2B interface absent\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established the native cellular function: SPCS1 negatively regulates SPase cleavage of transmembrane segments, protecting TM helices from inadvertent processing to sharpen substrate selection.\",\n      \"evidence\": \"In vivo SPase cleavage assays with modified signal sequences, deletion and overexpression strains, and co-IP with uncleaved TM-bearing substrates in yeast\",\n      \"pmids\": [\"34125229\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether mammalian SPCS1 protects TM segments by the same mechanism not directly tested\", \"No structural picture of how SPCS1 occludes TM substrates from the active site\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended SPCS1 dependence to ZIKV replication in a physiologically relevant placental trophoblast context, supporting its general role across flavivirus tropisms.\",\n      \"evidence\": \"Pooled CRISPR/Cas9 screen in trophoblasts with SPCS1 KO validation\",\n      \"pmids\": [\"33577859\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Limited mechanistic detail\", \"Cell-type-specific contribution not dissected\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Pinpointed the molecular reason for SPCS1 dependence in HCV: it facilitates cleavage of the intrinsically delayed E2-p7 junction by enhancing its presentation to the SPC active site.\",\n      \"evidence\": \"SPCS1 KO/KD with site-specific cleavage readouts, plus structural modeling and molecular dynamics simulations of the p7 TM helix\",\n      \"pmids\": [\"35130329\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural evidence is computational, not experimental\", \"Single lab\", \"Generalizability of the 'presentation' model to other substrates untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed SPCS1's signal-peptide processing role extends beyond Flaviviridae, mediating rotavirus VP7 signal-peptide cleavage and proper virion maturation via a defined VP7 contact residue.\",\n      \"evidence\": \"TAP-MS, CRISPR KO/siRNA, VP7 E256R mutagenesis, TEM ultrastructure, and VP7 signal-peptide cleavage assay\",\n      \"pmids\": [\"41860932\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single VP7 residue couples to SPCS1-dependent cleavage not structurally resolved\", \"Breadth across other non-flavivirus signal-peptide substrates unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Implicated SPCS1 in a receptor-upregulation axis promoting HPV entry downstream of T. vaginalis adhesion, hinting at a role beyond direct signal-peptide processing.\",\n      \"evidence\": \"siRNA knockdown, dual-knockdown epistasis, HPV infection quantification, and receptor expression measurement in keratinocytes\",\n      \"pmids\": [\"41199321\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism by which SPCS1 controls CD151/HSPG2 expression unresolved\", \"Single lab\", \"Connection to canonical SPC processing function unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"An experimental high-resolution structure of human SPCS1 within the assembled SPC and a definition of the signal-peptide sequence determinants that render a substrate SPCS1-dependent remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No experimental structure of SPCS1 in the SPC\", \"Sequence/biophysical rules of SPCS1-dependent cargo undefined\", \"Any catalytic-independent function (e.g., receptor regulation) not mechanistically explained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [5, 7, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 4, 8]}\n    ],\n    \"complexes\": [\"signal peptidase complex (SPC)\"],\n    \"partners\": [\"SEC11\", \"NS2\", \"E2\", \"NS2B\", \"VP7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}