Crystal structure of the Fab domain of omalizumab at 2.41A


Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
B [auth L]4HBT_3e2xa8L1 A: a/b three-layered sandwichesX: Lipocalins/StreptavidinH: Zn-dependent exopeptidasesT: Zn-dependent exopeptidasesF: 4HBT_3ECOD (v294.1)
A [auth H]Proteasomee2xa8H1 A: a/b three-layered sandwichesX: EF-handH: Insect pheromone/odorant-binding proteinsT: Insect pheromone/odorant-binding proteinsF: ProteasomeECOD (v294.1)
A [auth H]Ig_2e2xa8H3 A: a/b three-layered sandwichesX: Subtilisin-likeH: Subtilisin-likeT: Subtilisin-likeF: Ig_2ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
B [auth L]2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)
A [auth H]2.60.40.10 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
B [auth L]IGE25, rhuMab-E25 L-KAPPA Homo sapiens (human) IGKV1-39*01, IGKV1D-39*01, IGKJ2*01, IGKC*01 V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA IG FAB-GAMMA-1_KAPPA IMGT (202615-0)
A [auth H]IGE25, rhuMab-E25 VH-CH1 Homo sapiens (human) IGHV3-66*01, IGHV3-66*02, IGHV3-66*04, IGHJ2*01, IGHG1*01, IGHG1*02, IGHG1*03 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-GAMMA-1_KAPPA IMGT (202615-0)

SAbDab Antibody Annotation SAbDab Database Homepage

ChainChain ClassChain SubclassChain TypeAntigen Name(s) Provenance Source
B [auth L]Light ChainIGKV1 Kappa-SAbDab (2026-04-24)
A [auth H]Heavy ChainIGHV3 --SAbDab (2026-04-24)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

ChainNameTargetProvenance Source
B [auth L] Omalizumab IGHETherapeutic SAbDab (2026-04-24)
A [auth H] Omalizumab IGHETherapeutic SAbDab (2026-04-24)