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Crystal structure of HIV-1 neutralizing human Fab Z13e1 in complex with a 12-residue peptide containing the Z13e1 epitope on gp41 External Resource: Annotation Chains Family Name Domain Identifier Architecture Possible Homology Homology Topology Family Provenance Source (Version) B [auth H] V-set e3fn0H1 A: alpha arrays X: Alpha-beta plaits H: Immunoglobulin-related T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like F: V-set ECOD (v295.2) A [auth L] YgbB e3fn0L1 A: alpha arrays X: HTH H: HTH T: tetra-helical, lambda repressor-like F: YgbB ECOD (v295.2)
Chain Protein Name Description Organism Name Gene Allele Name(s) Domain Name(s) Receptor Type Receptor Description Provenance Source B [auth H] Z13E1 mAb, anti-gp41 [HIV-1], neutralizing VH-CH1 Homo sapiens (human) IGHV4-59*01, IGHV4-59*02, IGHV4-59*08, IGHJ6*03, IGHG1*01, IGHG1*02, IGHG1*04, IGHG1*05 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-GAMMA-1_KAPPA IMGT (202637-0) A [auth L] Z13E1 mAb, anti-gp41 [HIV-1], neutralizing L-KAPPA Homo sapiens (human) IGKV3D-11*02, IGKV3D-11*03, IGKJ1*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 B [auth H] Heavy Chain IGHV4 - envelope polyprotein gp160 SAbDab (2026-09-25) A [auth L] Light Chain IGKV3D Kappa envelope polyprotein gp160 SAbDab (2026-09-25)