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Crystal Structure of Fab 9H+3L, a putative precursor of the PGT121 family of potent HIV-1 antibodies External Resource: Annotation Chains Family Name Domain Identifier Architecture Possible Homology Homology Topology Family Provenance Source (Version) D PI3_PI4_kinase e5ceyD2 A: alpha arrays X: Restriction endonuclease-like H: HTH T: winged helix domain F: PI3_PI4_kinase ECOD (v295.2) D NTP_transferase e5ceyD3 A: alpha arrays X: Lipocalins/Streptavidin H: SAM/DNA-glycosylase T: SAM domain-like F: NTP_transferase ECOD (v295.2) B PI3_PI4_kinase e5ceyB2 A: alpha arrays X: Restriction endonuclease-like H: HTH T: winged helix domain F: PI3_PI4_kinase ECOD (v295.2) B NTP_transferase e5ceyB1 A: alpha arrays X: Lipocalins/Streptavidin H: SAM/DNA-glycosylase T: SAM domain-like F: NTP_transferase ECOD (v295.2) C PI3_PI4_kinase e5ceyC1 A: alpha arrays X: Restriction endonuclease-like H: HTH T: winged helix domain F: PI3_PI4_kinase ECOD (v295.2) A PI3_PI4_kinase e5ceyA1 A: alpha arrays X: Restriction endonuclease-like H: HTH T: winged helix domain F: PI3_PI4_kinase ECOD (v295.2)
Chain Protein Name Description Organism Name Gene Allele Name(s) Domain Name(s) Receptor Type Receptor Description Provenance Source 9H+3L Fab VH-CH1 Homo sapiens (human) IGHV4-59*01, IGHV4-59*03, IGHV4-59*08, IGHV4-4*08, IGHJ6*03, IGHG1*01, IGHG1*02, IGHG1*04, IGHG1*05 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-GAMMA-1_LAMBDA IMGT (202636-0) 9H+3L Fab L-LAMBDA Homo sapiens (human) IGLV3-21*01, IGLJ3*02, IGLC3*03 V-DOMAIN V-LAMBDA, C-DOMAIN C-LAMBDA IG FAB-GAMMA-1_LAMBDA IMGT (202636-0)
Chain Chain Class Chain Subclass Chain Type Antigen Name(s) Provenance Source Heavy Chain IGHV4 - - SAbDab (2026-09-18)