3QNX | pdb_00003qnx

Orthorhombic form of human IgA1 Fab fragment, sharing same Fv as IgG


Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AI-sete3qnxA1 A: alpha bundlesX: cradle loop barrelH: RIFT-relatedT: acid proteaseF: I-setECOD (develop294)
BI-sete3qnxB1 A: alpha bundlesX: cradle loop barrelH: RIFT-relatedT: acid proteaseF: I-setECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)
B2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

ChainProtein NameDescriptionOrganism NameGene Allele Name(s)Domain Name(s)Receptor TypeReceptor DescriptionProvenance Source
Antibody Fab Fragment L-KAPPA Homo sapiens (human) IGKV2-28*01, IGKV2D-28*01, IGKJ5*01, IGKC*01 V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA IG FAB-ALPHA-1_KAPPA IMGT (202610-0)
Antibody Fab Fragment VH-CH1 Homo sapiens (human) IGHV3-73*01, IGHV3-73*02, IGHJ1*01, IGHA1*01 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-ALPHA-1_KAPPA IMGT (202610-0)

SAbDab Antibody Annotation SAbDab Database Homepage

ChainChain ClassChain SubclassChain TypeAntigen Name(s) Provenance Source
Light ChainIGKV2 Kappa-SAbDab (2026-03-20)
Heavy ChainIGHV3 --SAbDab (2026-03-20)