Crystal Structure of TcdA-A2 Bound to Two Molecules of A20.1 VHH


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

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APolyA_pole4nbyA1 A: beta barrelsX: Thioredoxin-likeH: Thioredoxin-likeT: Thioredoxin-likeF: PolyA_polECOD (v294.2)
BEF-hand_1,S_100e4nbyB1 A: beta barrelsX: dsRBD-likeH: Peptidyl-tRNA hydrolase domain-likeT: Peptidyl-tRNA hydrolase domain-likeF: EF-hand_1,S_100ECOD (v294.2)
CEF-hand_1,S_100e4nbyC1 A: beta barrelsX: dsRBD-likeH: Peptidyl-tRNA hydrolase domain-likeT: Peptidyl-tRNA hydrolase domain-likeF: EF-hand_1,S_100ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A2.10.270.10 Mainly Beta Ribbon left handed beta-beta-3-solenoid Cholin BindingCATH (4.3.0)
B2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)
C2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

ChainProtein NameDescriptionOrganism NameGene Allele Name(s)Domain Name(s)Receptor TypeReceptor DescriptionProvenance Source
B, C
A20.1 VHH VH Lama glama (llama) IGHV3S3*01, IGHJ4*01 V-DOMAIN VH IG (VH) IMGT (202618-0)

SAbDab Antibody Annotation SAbDab Database Homepage

ChainChain ClassChain SubclassChain TypeAntigen Name(s) Provenance Source
B, C
Heavy ChainIGHV1 -cell wall-binding repeat proteinSAbDab (2026-05-15)