{"gene":"DCD","run_date":"2026-06-09T23:54:41","timeline":{"discoveries":[{"year":2017,"finding":"NMR structure of DCD-1L in SDS micelles revealed an 'L-shaped' molecule with three fully formed α-helices connected by flexible turns. The acidic C-terminal region suppresses binding of DCD-1L to POPG vesicles at basic but not acidic pH. Charged residues on the N-terminal and C-terminal regions play distinct functional roles in membrane binding, Zn2+ coordination, and peptide aggregation.","method":"NMR structure determination in SDS micelles; POPG vesicle binding assays; site-directed mutagenesis of charged residues; 1D NMR aggregation monitoring","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with functional mutagenesis and lipid-binding assays in a single rigorous study","pmids":["29066724"],"is_preprint":false},{"year":2002,"finding":"The human DCD protein (identified as DSEP, diffusible survival evasion peptide) was shown to confer survival advantages when overexpressed in neural cells, including resistance to oxidative stress, resistance to activated macrophages in xenoculture, and survival as xenografts in rat brain without immunosuppression. The survival advantage was partly attributed to an attenuated response to all-trans-retinoic acid.","method":"Genetic overexpression in mouse and human neural cell lines; oxidative stress assays; xenoculture with activated macrophages; xenograft implantation in rat brain","journal":"Experimental neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean overexpression with defined cellular phenotypes across multiple assays, single lab","pmids":["12429208"],"is_preprint":false},{"year":2022,"finding":"DCD-1L inhibited bacterial adhesion and biofilm formation in A. baumannii at 2×–8× MIC, destroyed pre-formed biofilm only at 8× MIC, and downregulated biofilm-associated genes. In an in vivo burn wound model, DCD-1L reduced bacterial counts and promoted wound healing by accelerating skin re-epithelialization. DCD-1L showed no cytotoxic or hemolytic activity at effective concentrations.","method":"In vitro minimum inhibitory concentration assay; biofilm formation and destruction assays; RT-PCR gene expression; catheter-associated infection model; in vivo murine burn wound model with histopathology","journal":"BMC microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal in vitro and in vivo methods in a single study, single lab","pmids":["35026999"],"is_preprint":false}],"current_model":"Human dermcidin (DCD) is constitutively secreted by sweat glands as a precursor that is proteolytically processed to yield the antimicrobial peptide DCD-1L; NMR structural analysis shows DCD-1L adopts an L-shaped three-helix conformation in membrane-mimetic environments, with distinct N- and C-terminal charged regions governing pH-dependent membrane binding and Zn2+-coordinated aggregation, and overexpression of the full-length protein (DSEP) confers neural cell survival under oxidative stress conditions."},"narrative":{"mechanistic_narrative":"Dermcidin (DCD) encodes a secreted precursor that is proteolytically processed to the antimicrobial peptide DCD-1L, which acts at membrane and biofilm interfaces in host defense [PMID:29066724, PMID:35026999]. NMR analysis in membrane-mimetic micelles shows DCD-1L folds into an L-shaped molecule of three α-helices joined by flexible turns, in which charged residues of the N- and C-terminal regions carry distinct roles: the acidic C-terminal region suppresses binding to POPG membranes at basic but not acidic pH, and charged residues govern Zn2+ coordination and peptide aggregation [PMID:29066724]. Functionally, DCD-1L inhibits bacterial adhesion and biofilm formation, downregulates biofilm-associated genes, and accelerates re-epithelialization in a burn-wound infection model without cytotoxic or hemolytic activity at effective concentrations [PMID:35026999]. Independently, the full-length protein (designated DSEP) confers a survival advantage when overexpressed in neural cells, including resistance to oxidative stress and immune-mediated killing [PMID:12429208]. Beyond these findings, the protease(s) generating DCD-1L and the molecular receptor/target of its survival activity have not been characterized in the available corpus.","teleology":[{"year":2002,"claim":"Established that the full-length DCD product (DSEP) has a cell-protective function beyond antimicrobial defense, conferring survival under oxidative and immune stress.","evidence":"genetic overexpression in mouse and human neural cell lines with oxidative stress, macrophage xenoculture, and rat-brain xenograft assays","pmids":["12429208"],"confidence":"Medium","gaps":["no molecular receptor or signaling pathway for the survival effect identified","single-lab overexpression phenotype not linked to endogenous DCD","mechanism connecting DSEP to attenuated retinoic-acid response unresolved"]},{"year":2017,"claim":"Defined the three-dimensional fold of the processed peptide DCD-1L and the structural basis of its pH- and Zn2+-dependent membrane interactions.","evidence":"NMR structure determination in SDS micelles with POPG vesicle binding, charged-residue mutagenesis, and aggregation monitoring","pmids":["29066724"],"confidence":"High","gaps":["structure determined in micelles, not a native bacterial membrane","mechanism of membrane permeabilization or pore formation not resolved","processing protease that generates DCD-1L from precursor not identified"]},{"year":2022,"claim":"Demonstrated that DCD-1L acts on bacterial biofilms and promotes wound healing in vivo, extending its activity from membrane binding to anti-biofilm and tissue-repair functions.","evidence":"in vitro MIC, biofilm formation/destruction and RT-PCR gene expression assays in A. baumannii, plus an in vivo murine burn-wound model with histopathology","pmids":["35026999"],"confidence":"Medium","gaps":["molecular target mediating biofilm gene downregulation unknown","results limited to A. baumannii in a single study","link between structural determinants and anti-biofilm efficacy not established"]},{"year":null,"claim":"The endogenous protease(s) processing the DCD precursor and the host receptor/target underlying both its antimicrobial and cytoprotective activities remain unidentified.","evidence":"","pmids":[],"confidence":"Medium","gaps":["no processing enzyme characterized in the corpus","no defined receptor or signaling axis for survival or anti-biofilm effects"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P81605","full_name":"Dermcidin","aliases":["Preproteolysin"],"length_aa":110,"mass_kda":11.3,"function":"Found in sweat, has an antimicrobial activity during early bacterial colonization (PubMed:11694882, PubMed:23426625). The secreted peptide assembles into homohexameric complexes that can associate with and also insert into pathogen membranes (PubMed:23426625). Once inserted in bacteria membranes forms anion channels probably altering the transmembrane potential essential for bacterial survival (PubMed:23426625). Highly effective against E.coli, E.faecalis, S.aureus and C.albicans (PubMed:11694882). Optimal pH and salt concentration resemble the conditions in sweat (PubMed:11694882). Also exhibits proteolytic activity, cleaving on the C-terminal side of Arg and, to a lesser extent, Lys residues (PubMed:17448443) Promotes survival of neurons and displays phosphatase activity (PubMed:9736629). It may bind IgG (PubMed:9736629)","subcellular_location":"Secreted; Membrane; Membrane","url":"https://www.uniprot.org/uniprotkb/P81605/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DCD","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"LAMP1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/DCD","total_profiled":1310},"omim":[{"mim_id":"606634","title":"DERMCIDIN; DCD","url":"https://www.omim.org/entry/606634"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"skin 1","ntpm":3313.5}],"url":"https://www.proteinatlas.org/search/DCD"},"hgnc":{"alias_symbol":["AIDD","PIF","DSEP","HCAP","DCD-1"],"prev_symbol":[]},"alphafold":{"accession":"P81605","domains":[{"cath_id":"1.20.5","chopping":"65-110","consensus_level":"medium","plddt":72.5976,"start":65,"end":110}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P81605","model_url":"https://alphafold.ebi.ac.uk/files/AF-P81605-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P81605-F1-predicted_aligned_error_v6.png","plddt_mean":64.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DCD","jax_strain_url":"https://www.jax.org/strain/search?query=DCD"},"sequence":{"accession":"P81605","fasta_url":"https://rest.uniprot.org/uniprotkb/P81605.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P81605/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P81605"}},"corpus_meta":[{"pmid":"19679771","id":"PMC_19679771","title":"An acidic matrix protein, 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design.","date":"2009","source":"Twin research and human genetics : the official journal of the International Society for Twin Studies","url":"https://pubmed.ncbi.nlm.nih.gov/19653839","citation_count":24,"is_preprint":false},{"pmid":"28704412","id":"PMC_28704412","title":"Synthetic PreImplantation Factor (PIF) prevents fetal loss by modulating LPS induced inflammatory response.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/28704412","citation_count":23,"is_preprint":false},{"pmid":"9237230","id":"PMC_9237230","title":"Embryonic origin of preimplantation factor (PIF): biological activity and partial characterization.","date":"1996","source":"Molecular human reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/9237230","citation_count":23,"is_preprint":false},{"pmid":"17585368","id":"PMC_17585368","title":"The N-terminal hydrophobic sequence of Autographa californica nucleopolyhedrovirus PIF-3 is essential for oral infection.","date":"2007","source":"Archives of virology","url":"https://pubmed.ncbi.nlm.nih.gov/17585368","citation_count":23,"is_preprint":false},{"pmid":"37322175","id":"PMC_37322175","title":"Developments in the classification and nomenclature of arthropod-infecting large DNA viruses that contain pif genes.","date":"2023","source":"Archives of virology","url":"https://pubmed.ncbi.nlm.nih.gov/37322175","citation_count":22,"is_preprint":false},{"pmid":"26635289","id":"PMC_26635289","title":"Lipidomics comparing DCD and DBD liver allografts uncovers lysophospholipids elevated in recipients undergoing early allograft dysfunction.","date":"2015","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/26635289","citation_count":22,"is_preprint":false},{"pmid":"26257082","id":"PMC_26257082","title":"PreImplantation Factor (PIF*) endogenously prevents preeclampsia: Promotes trophoblast invasion and reduces oxidative stress.","date":"2015","source":"Journal of reproductive immunology","url":"https://pubmed.ncbi.nlm.nih.gov/26257082","citation_count":21,"is_preprint":false},{"pmid":"14769890","id":"PMC_14769890","title":"Transcription and promoter analysis of pif, an essential but low-expressed baculovirus gene.","date":"2004","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/14769890","citation_count":21,"is_preprint":false},{"pmid":"17996080","id":"PMC_17996080","title":"Diversity and structure of PIF/Harbinger-like elements in the genome of Medicago truncatula.","date":"2007","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/17996080","citation_count":21,"is_preprint":false},{"pmid":"33802753","id":"PMC_33802753","title":"Subnormothermic Perfusion with H2S Donor AP39 Improves DCD Porcine Renal Graft Outcomes in an Ex Vivo Model of Kidney Preservation and Reperfusion.","date":"2021","source":"Biomolecules","url":"https://pubmed.ncbi.nlm.nih.gov/33802753","citation_count":21,"is_preprint":false},{"pmid":"29073617","id":"PMC_29073617","title":"Preimplantation Factor (PIF) Promotes HLA-G, -E, -F, -C Expression in JEG-3 Choriocarcinoma Cells and Endogenous Progesterone Activity.","date":"2017","source":"Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/29073617","citation_count":19,"is_preprint":false},{"pmid":"2993231","id":"PMC_2993231","title":"F factor inhibition of conjugal transfer of broad-host-range plasmid RP4: requirement for the protein product of pif operon regulatory gene pifC.","date":"1985","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/2993231","citation_count":19,"is_preprint":false},{"pmid":"28045490","id":"PMC_28045490","title":"An Allosteric Inhibitor Scaffold Targeting the PIF-Pocket of Atypical Protein Kinase C Isoforms.","date":"2017","source":"ACS chemical biology","url":"https://pubmed.ncbi.nlm.nih.gov/28045490","citation_count":18,"is_preprint":false},{"pmid":"26944449","id":"PMC_26944449","title":"PreImplantation factor (PIF*) regulates systemic immunity and targets protective regulatory and cytoskeleton proteins.","date":"2016","source":"Immunobiology","url":"https://pubmed.ncbi.nlm.nih.gov/26944449","citation_count":17,"is_preprint":false},{"pmid":"35026999","id":"PMC_35026999","title":"Antimicrobial and anti-biofilm potencies of dermcidin-derived peptide DCD-1L against Acinetobacter baumannii: an in vivo wound healing model.","date":"2022","source":"BMC microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/35026999","citation_count":17,"is_preprint":false},{"pmid":"25099698","id":"PMC_25099698","title":"A homeodomain transcription factor gene, PfMSX, activates expression of Pif gene in the pearl oyster Pinctada fucata.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25099698","citation_count":17,"is_preprint":false},{"pmid":"27449294","id":"PMC_27449294","title":"PreImplantation factor (PIF) therapy provides comprehensive protection against radiation induced pathologies.","date":"2016","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/27449294","citation_count":17,"is_preprint":false},{"pmid":"28730469","id":"PMC_28730469","title":"Optogenetic Control of Ras/Erk Signaling Using the Phy-PIF System.","date":"2017","source":"Methods in molecular biology (Clifton, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/28730469","citation_count":17,"is_preprint":false},{"pmid":"37924707","id":"PMC_37924707","title":"Mitochondrial injury during normothermic regional perfusion (NRP) and hypothermic oxygenated perfusion (HOPE) in a rodent model of DCD liver transplantation.","date":"2023","source":"EBioMedicine","url":"https://pubmed.ncbi.nlm.nih.gov/37924707","citation_count":17,"is_preprint":false},{"pmid":"34934807","id":"PMC_34934807","title":"Mitochondrial Damage-associated Molecular Patterns as Potential Biomarkers in DCD Heart Transplantation: Lessons From Myocardial Infarction and Cardiac Arrest.","date":"2021","source":"Transplantation direct","url":"https://pubmed.ncbi.nlm.nih.gov/34934807","citation_count":17,"is_preprint":false},{"pmid":"38811542","id":"PMC_38811542","title":"PIF transcriptional regulators are required for rhythmic stomatal movements.","date":"2024","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/38811542","citation_count":16,"is_preprint":false},{"pmid":"34285696","id":"PMC_34285696","title":"Heme Oxygenase-1-Modified Bone Marrow Mesenchymal Stem Cells Combined with Normothermic Machine Perfusion Repairs Bile Duct Injury in a Rat Model of DCD Liver Transplantation via Activation of Peribiliary Glands through the Wnt Pathway.","date":"2021","source":"Stem cells international","url":"https://pubmed.ncbi.nlm.nih.gov/34285696","citation_count":16,"is_preprint":false},{"pmid":"1084364","id":"PMC_1084364","title":"Relationship of CIF, LT, and PIF released in vitro by activated human lymphocytes. II. A further functional comparison of LT and PIF activities on HeLa and L-929 target cells.","date":"1976","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/1084364","citation_count":16,"is_preprint":false},{"pmid":"28503745","id":"PMC_28503745","title":"Interactions Between phyB and PIF Proteins Alter Thermal Reversion Reactions in vitro.","date":"2017","source":"Photochemistry and photobiology","url":"https://pubmed.ncbi.nlm.nih.gov/28503745","citation_count":16,"is_preprint":false},{"pmid":"28423529","id":"PMC_28423529","title":"PIF* promotes brain re-myelination locally while regulating systemic inflammation- clinically relevant multiple sclerosis M.smegmatis model.","date":"2017","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/28423529","citation_count":16,"is_preprint":false},{"pmid":"8526994","id":"PMC_8526994","title":"Preimplantation factor (PIF) predicts subsequent pregnancy loss.","date":"1995","source":"American journal of reproductive immunology (New York, N.Y. : 1989)","url":"https://pubmed.ncbi.nlm.nih.gov/8526994","citation_count":16,"is_preprint":false},{"pmid":"33148243","id":"PMC_33148243","title":"Modified base-binding EVE and DCD domains: striking diversity of genomic contexts in prokaryotes and predicted involvement in a variety of cellular processes.","date":"2020","source":"BMC biology","url":"https://pubmed.ncbi.nlm.nih.gov/33148243","citation_count":15,"is_preprint":false},{"pmid":"27569991","id":"PMC_27569991","title":"DELLA-PIF Modules: Old Dogs Learn New Tricks.","date":"2016","source":"Trends in plant science","url":"https://pubmed.ncbi.nlm.nih.gov/27569991","citation_count":15,"is_preprint":false},{"pmid":"22820507","id":"PMC_22820507","title":"Role of Ca2+ in proteolysis-inducing factor (PIF)-induced atrophy of skeletal muscle.","date":"2012","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/22820507","citation_count":15,"is_preprint":false},{"pmid":"18701116","id":"PMC_18701116","title":"Deterioration of endothelial and smooth muscle cell function in DCD kidneys after static cold storage in IGL-1 or UW.","date":"2008","source":"The Journal of surgical research","url":"https://pubmed.ncbi.nlm.nih.gov/18701116","citation_count":15,"is_preprint":false},{"pmid":"36421466","id":"PMC_36421466","title":"Cytokine Adsorber Use during DCD Heart Perfusion Counteracts Coronary Microvascular Dysfunction.","date":"2022","source":"Antioxidants (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/36421466","citation_count":14,"is_preprint":false},{"pmid":"29066724","id":"PMC_29066724","title":"Structural basis for the bacterial membrane insertion of dermcidin peptide, DCD-1L.","date":"2017","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/29066724","citation_count":14,"is_preprint":false},{"pmid":"26085845","id":"PMC_26085845","title":"PreImplantation factor (PIF*) promotes embryotrophic and neuroprotective decidual genes: effect negated by epidermal growth factor.","date":"2014","source":"Journal of neurodevelopmental disorders","url":"https://pubmed.ncbi.nlm.nih.gov/26085845","citation_count":14,"is_preprint":false},{"pmid":"29465345","id":"PMC_29465345","title":"The group I alphabaculovirus-specific protein, AC5, is a novel component of the occlusion body but is not associated with ODVs or the PIF complex.","date":"2018","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/29465345","citation_count":14,"is_preprint":false},{"pmid":"20685000","id":"PMC_20685000","title":"Isolation and molecular identification of Cronobacter spp. from powdered infant formula (PIF) in Bangladesh.","date":"2010","source":"International journal of food microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/20685000","citation_count":14,"is_preprint":false},{"pmid":"6090412","id":"PMC_6090412","title":"Regulation of the F-factor pif operon: pifO, a site required in cis for autoregulation, titrates the pifC product in trans.","date":"1984","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/6090412","citation_count":14,"is_preprint":false},{"pmid":"28141488","id":"PMC_28141488","title":"Protein-protein interactions of the baculovirus per os infectivity factors (PIFs) in the PIF complex.","date":"2017","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/28141488","citation_count":13,"is_preprint":false},{"pmid":"23911092","id":"PMC_23911092","title":"PIF-pocket as a target for C. albicans Pkh selective inhibitors.","date":"2013","source":"ACS chemical biology","url":"https://pubmed.ncbi.nlm.nih.gov/23911092","citation_count":13,"is_preprint":false},{"pmid":"24012501","id":"PMC_24012501","title":"Pseudoplusia includens single nucleopolyhedrovirus: genetic diversity, phylogeny and hypervariability of the pif-2 gene.","date":"2013","source":"Journal of invertebrate pathology","url":"https://pubmed.ncbi.nlm.nih.gov/24012501","citation_count":13,"is_preprint":false},{"pmid":"21673682","id":"PMC_21673682","title":"Attenuation of muscle atrophy by an N-terminal peptide of the receptor for proteolysis-inducing factor (PIF).","date":"2011","source":"British journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/21673682","citation_count":13,"is_preprint":false},{"pmid":"38946036","id":"PMC_38946036","title":"Wogonin Alleviates DCD Liver Ischemia/Reperfusion Injury by Regulating ALOX15/iNOS-mediated Ferroptosis.","date":"2024","source":"Transplantation","url":"https://pubmed.ncbi.nlm.nih.gov/38946036","citation_count":12,"is_preprint":false},{"pmid":"36982476","id":"PMC_36982476","title":"Hypothermic Oxygenated Machine Perfusion Promotes Mitophagy Flux against Hypoxia-Ischemic Injury in Rat DCD Liver.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36982476","citation_count":12,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51834,"output_tokens":1260,"usd":0.087201,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7401,"output_tokens":1612,"usd":0.038652,"stage2_stop_reason":"end_turn"},"total_usd":0.125853,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify papers about the human gene DCD (dermcidin, also known as AIDD, PIF, DSEP, DCD-1). \n\nThe gene DCD encodes dermcidin, an antimicrobial peptide secreted by sweat glands. The aliases include DCD-1 (the processed peptide form) and DSEP (diffusible survival evasion peptide).\n\nLet me analyze the relevant papers:\n\n- **PMID 29066724**: About DCD-1L (dermcidin-1L) NMR structure and membrane insertion mechanism - directly relevant\n- **PMID 35026999**: About DCD-1L antimicrobial/anti-biofilm activity against A. baumannii - relevant\n- **PMID 12429208**: About DSEP (same gene as DCD) - survival/evasion peptide - relevant\n\nMany other papers in the corpus are about completely different \"PIF\" or \"DCD\" entities:\n- PDK1-interacting fragment (PIF) papers = different protein\n- Phytochrome-interacting factors (PIF) = plant proteins\n- Per os infectivity factors (pif) = baculovirus proteins\n- Donation after circulatory death (DCD) = clinical/medical acronym\n- Pif helicase (yeast) = different gene\n- Preimplantation factor (PIF) = different peptide\n- Plant DCD domain = different gene\n- Proteolysis-inducing factor (PIF) = different factor\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2017,\n      \"finding\": \"NMR structure of DCD-1L in SDS micelles revealed an 'L-shaped' molecule with three fully formed α-helices connected by flexible turns. The acidic C-terminal region suppresses binding of DCD-1L to POPG vesicles at basic but not acidic pH. Charged residues on the N-terminal and C-terminal regions play distinct functional roles in membrane binding, Zn2+ coordination, and peptide aggregation.\",\n      \"method\": \"NMR structure determination in SDS micelles; POPG vesicle binding assays; site-directed mutagenesis of charged residues; 1D NMR aggregation monitoring\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with functional mutagenesis and lipid-binding assays in a single rigorous study\",\n      \"pmids\": [\"29066724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The human DCD protein (identified as DSEP, diffusible survival evasion peptide) was shown to confer survival advantages when overexpressed in neural cells, including resistance to oxidative stress, resistance to activated macrophages in xenoculture, and survival as xenografts in rat brain without immunosuppression. The survival advantage was partly attributed to an attenuated response to all-trans-retinoic acid.\",\n      \"method\": \"Genetic overexpression in mouse and human neural cell lines; oxidative stress assays; xenoculture with activated macrophages; xenograft implantation in rat brain\",\n      \"journal\": \"Experimental neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean overexpression with defined cellular phenotypes across multiple assays, single lab\",\n      \"pmids\": [\"12429208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DCD-1L inhibited bacterial adhesion and biofilm formation in A. baumannii at 2×–8× MIC, destroyed pre-formed biofilm only at 8× MIC, and downregulated biofilm-associated genes. In an in vivo burn wound model, DCD-1L reduced bacterial counts and promoted wound healing by accelerating skin re-epithelialization. DCD-1L showed no cytotoxic or hemolytic activity at effective concentrations.\",\n      \"method\": \"In vitro minimum inhibitory concentration assay; biofilm formation and destruction assays; RT-PCR gene expression; catheter-associated infection model; in vivo murine burn wound model with histopathology\",\n      \"journal\": \"BMC microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal in vitro and in vivo methods in a single study, single lab\",\n      \"pmids\": [\"35026999\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Human dermcidin (DCD) is constitutively secreted by sweat glands as a precursor that is proteolytically processed to yield the antimicrobial peptide DCD-1L; NMR structural analysis shows DCD-1L adopts an L-shaped three-helix conformation in membrane-mimetic environments, with distinct N- and C-terminal charged regions governing pH-dependent membrane binding and Zn2+-coordinated aggregation, and overexpression of the full-length protein (DSEP) confers neural cell survival under oxidative stress conditions.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Dermcidin (DCD) encodes a secreted precursor that is proteolytically processed to the antimicrobial peptide DCD-1L, which acts at membrane and biofilm interfaces in host defense [#0, #2]. NMR analysis in membrane-mimetic micelles shows DCD-1L folds into an L-shaped molecule of three α-helices joined by flexible turns, in which charged residues of the N- and C-terminal regions carry distinct roles: the acidic C-terminal region suppresses binding to POPG membranes at basic but not acidic pH, and charged residues govern Zn2+ coordination and peptide aggregation [#0]. Functionally, DCD-1L inhibits bacterial adhesion and biofilm formation, downregulates biofilm-associated genes, and accelerates re-epithelialization in a burn-wound infection model without cytotoxic or hemolytic activity at effective concentrations [#2]. Independently, the full-length protein (designated DSEP) confers a survival advantage when overexpressed in neural cells, including resistance to oxidative stress and immune-mediated killing [#1]. Beyond these findings, the protease(s) generating DCD-1L and the molecular receptor/target of its survival activity have not been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established that the full-length DCD product (DSEP) has a cell-protective function beyond antimicrobial defense, conferring survival under oxidative and immune stress.\",\n      \"evidence\": \"genetic overexpression in mouse and human neural cell lines with oxidative stress, macrophage xenoculture, and rat-brain xenograft assays\",\n      \"pmids\": [\"12429208\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"no molecular receptor or signaling pathway for the survival effect identified\",\n        \"single-lab overexpression phenotype not linked to endogenous DCD\",\n        \"mechanism connecting DSEP to attenuated retinoic-acid response unresolved\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the three-dimensional fold of the processed peptide DCD-1L and the structural basis of its pH- and Zn2+-dependent membrane interactions.\",\n      \"evidence\": \"NMR structure determination in SDS micelles with POPG vesicle binding, charged-residue mutagenesis, and aggregation monitoring\",\n      \"pmids\": [\"29066724\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"structure determined in micelles, not a native bacterial membrane\",\n        \"mechanism of membrane permeabilization or pore formation not resolved\",\n        \"processing protease that generates DCD-1L from precursor not identified\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Demonstrated that DCD-1L acts on bacterial biofilms and promotes wound healing in vivo, extending its activity from membrane binding to anti-biofilm and tissue-repair functions.\",\n      \"evidence\": \"in vitro MIC, biofilm formation/destruction and RT-PCR gene expression assays in A. baumannii, plus an in vivo murine burn-wound model with histopathology\",\n      \"pmids\": [\"35026999\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"molecular target mediating biofilm gene downregulation unknown\",\n        \"results limited to A. baumannii in a single study\",\n        \"link between structural determinants and anti-biofilm efficacy not established\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The endogenous protease(s) processing the DCD precursor and the host receptor/target underlying both its antimicrobial and cytoprotective activities remain unidentified.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"no processing enzyme characterized in the corpus\",\n        \"no defined receptor or signaling axis for survival or anti-biofilm effects\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}