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Crystal Structure of a Cross-Reactive HIV-1 Neutralizing CD4-Binding Site Antibody Fab m18 External Resource: Annotation Chains Family Name Domain Identifier Architecture Possible Homology Homology Topology Family Provenance Source (Version) F CopC e2aj3F1 A: alpha arrays X: HTH H: HTH T: tetra-helical, lambda repressor-like F: CopC ECOD (v295.2) D CopC e2aj3D1 A: alpha arrays X: HTH H: HTH T: tetra-helical, lambda repressor-like F: CopC ECOD (v295.2) B CopC e2aj3B1 A: alpha arrays X: HTH H: HTH T: tetra-helical, lambda repressor-like F: CopC ECOD (v295.2) E CopC e2aj3E1 A: alpha arrays X: HTH H: HTH T: tetra-helical, lambda repressor-like F: CopC ECOD (v295.2) C CopC e2aj3C1 A: alpha arrays X: HTH H: HTH T: tetra-helical, lambda repressor-like F: CopC ECOD (v295.2) A ADH_N e2aj3A1 A: alpha arrays X: Globin-like H: Globin-like T: Globin-like F: ADH_N ECOD (v295.2)
Chain Protein Name Description Organism Name Gene Allele Name(s) Domain Name(s) Receptor Type Receptor Description Provenance Source M18 VH-CH1 Homo sapiens (human) IGHV4-59*02, IGHJ4*01, IGHJ4*02, IGHJ4*03, IGHG1*01, IGHG1*02, IGHG1*04 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-GAMMA-1_KAPPA IMGT (202637-0) M18 L-KAPPA Homo sapiens (human) IGKV1-9*01, IGKJ2*01, IGKC*01 V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA IG FAB-GAMMA-1_KAPPA IMGT (202637-0)
Chain Chain Class Chain Subclass Chain Type Antigen Name(s) Provenance Source Heavy Chain IGHV4 - - SAbDab (2026-09-25) Light Chain IGKV1 Kappa - SAbDab (2026-09-25)