Fab fragment of Chikungunya virus neutralizing human monoclonal antibody 4J21


Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
B [auth L]CDP-OH_P_transfe5cgyL1 A: beta barrelsX: P-loop domains-likeH: Rubredoxin-relatedT: Rubredoxin-relatedF: CDP-OH_P_transfECOD (v294.2)
DCDP-OH_P_transfe5cgyD1 A: beta barrelsX: P-loop domains-likeH: Rubredoxin-relatedT: Rubredoxin-relatedF: CDP-OH_P_transfECOD (v294.2)
CCDP-OH_P_transfe5cgyC1 A: beta barrelsX: P-loop domains-likeH: Rubredoxin-relatedT: Rubredoxin-relatedF: CDP-OH_P_transfECOD (v294.2)
CEF-hand_1, EF-hand_6, EF-hand_7e5cgyC2 A: beta barrelsX: Lipocalins/StreptavidinH: SAM/DNA-glycosylaseT: SAM domain-likeF: EF-hand_1, EF-hand_6, EF-hand_7ECOD (v294.2)
A [auth H]CDP-OH_P_transfe5cgyH1 A: beta barrelsX: P-loop domains-likeH: Rubredoxin-relatedT: Rubredoxin-relatedF: CDP-OH_P_transfECOD (v294.2)
A [auth H]EF-hand_1, EF-hand_6, EF-hand_7e5cgyH2 A: beta barrelsX: Lipocalins/StreptavidinH: SAM/DNA-glycosylaseT: SAM domain-likeF: EF-hand_1, EF-hand_6, EF-hand_7ECOD (v294.2)

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)
D2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)
C2.60.40.10 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],
D
4J21 Fab L-LAMBDA Homo sapiens (human) IGLV1-44*01, IGLJ3*02, IGLC3*03 V-DOMAIN V-LAMBDA, C-DOMAIN C-LAMBDA IG FAB-GAMMA-1_LAMBDA IMGT (202617-0)
A [auth H],
C
4J21 Fab VH-CH1 Homo sapiens (human) IGHV7-4-1*02, IGHJ6*01, IGHJ6*02, IGHG1*03 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-GAMMA-1_LAMBDA IMGT (202617-0)

SAbDab Antibody Annotation SAbDab Database Homepage

ChainChain ClassChain SubclassChain TypeAntigen Name(s) Provenance Source
B [auth L],
D
Light ChainIGLV1 Lambda-SAbDab (2026-05-08)
A [auth H],
C
Heavy ChainIGHV7 --SAbDab (2026-05-08)