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Structure of kappa-on-heavy (KoH) antibody Fab bound to the cardiac hormone marinobufagenin External Resource: Annotation Chains Family Name Domain Identifier Architecture Possible Homology Homology Topology Family Provenance Source (Version) A [auth H] e6pycH1 A: alpha arrays X: Nat/Ivy H: Acyl-CoA N-acyltransferases (Nat) T: Acyl-CoA N-acyltransferases (Nat) F: ECOD (v295.2) B [auth L] e6pycL1 A: alpha arrays X: Nat/Ivy H: Acyl-CoA N-acyltransferases (Nat) T: Acyl-CoA N-acyltransferases (Nat) F: ECOD (v295.2) D [auth B] e6pycB1 A: alpha arrays X: Nat/Ivy H: Acyl-CoA N-acyltransferases (Nat) T: Acyl-CoA N-acyltransferases (Nat) F: ECOD (v295.2) C [auth A] e6pycA1 A: alpha arrays X: Nat/Ivy H: Acyl-CoA N-acyltransferases (Nat) T: Acyl-CoA N-acyltransferases (Nat) F: ECOD (v295.2)
Chain Protein Name Description Organism Name Gene Allele Name(s) Domain Name(s) Receptor Type Receptor Description Provenance Source A [auth H] Fab KoH (kappa-on-heavy), anti-marinobufagenin V-KAPPA-CH1 Homo sapiens (human) IGKV4-1*01, IGKJ1*01, IGHG4*01, IGHG4*04 V-DOMAIN V-KAPPA, C-DOMAIN CH1 IG [V-KAPPA-CH1]_[L-KAPPA] IMGT (202639-0) B [auth L] Fab KoH (kappa-on-heavy), anti-marinobufagenin L-KAPPA Homo sapiens (human) IGKV3-20*01, IGKJ2*02, IGKJ2*04, IGKC*01 V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA IG [V-KAPPA-CH1]_[L-KAPPA] IMGT (202639-0) D [auth B] Antibody Fab Fragment L-KAPPA Mus musculus (house mouse) IGKV6-32*01, IGKJ1*01, IGKC*01, IGKC*02 V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA IG FAB-GAMMA-1_KAPPA IMGT (202639-0) C [auth A] Antibody Fab Fragment VH-CH1 Mus musculus (house mouse) IGHV4-1*02, IGHJ3*01, IGHG1*02 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-GAMMA-1_KAPPA IMGT (202639-0)
Chain Chain Class Chain Subclass Chain Type Antigen Name(s) Provenance Source A [auth H] Light Chain IGKV4 Kappa (3beta,5beta,14alpha,15beta)-3,5-dihydroxy-14,15-epoxybufa-20,22-dienolide SAbDab (2026-10-09) B [auth L] Light Chain IGKV3 Kappa (3beta,5beta,14alpha,15beta)-3,5-dihydroxy-14,15-epoxybufa-20,22-dienolide SAbDab (2026-10-09) D [auth B] Light Chain IGKV6 Kappa - SAbDab (2026-10-09) C [auth A] Heavy Chain IGHV4 - - SAbDab (2026-10-09)