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Crystal structure of complex of the Bacillus anthracis major spore surface protein BclA with ScFv antibody fragment


Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AFAD_binding_4e3ab0A1 A: alpha arraysX: Alpha-beta plaitsH: Phage tail protein-likeT: Transmembrane protein 14AF: FAD_binding_4ECOD (v295.2)
DFAD_binding_4e3ab0D1 A: alpha arraysX: Alpha-beta plaitsH: Phage tail protein-likeT: Transmembrane protein 14AF: FAD_binding_4ECOD (v295.2)
FFAD_binding_4e3ab0F1 A: alpha arraysX: Alpha-beta plaitsH: Phage tail protein-likeT: Transmembrane protein 14AF: FAD_binding_4ECOD (v295.2)
CV-sete3ab0C1 A: alpha arraysX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Immunoglobulin/Fibronectin type III/E set domains/PapD-likeF: V-setECOD (v295.2)
BV-sete3ab0B1 A: alpha arraysX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Immunoglobulin/Fibronectin type III/E set domains/PapD-likeF: V-setECOD (v295.2)
EFAD_binding_4e3ab0E1 A: alpha arraysX: Alpha-beta plaitsH: Phage tail protein-likeT: Transmembrane protein 14AF: FAD_binding_4ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A2.60.120.40 Mainly Beta Sandwich Jelly Rolls CATH (4.3.0)
D2.60.120.40 Mainly Beta Sandwich Jelly Rolls CATH (4.3.0)
F2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)
C2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)
B2.60.40.10 Mainly Beta Sandwich Immunoglobulin-like ImmunoglobulinsCATH (4.3.0)
E2.60.40.10 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
C, F
A4D11 scFv V-KAPPA Mus musculus (house mouse) IGKV4-61*01, IGKJ1*01, IGKJ1*02, IGKJ2*01 V-DOMAIN V-KAPPA IG FV-HEAVY_KAPPA IMGT (202640-0)
B, E
A4D11 scFv VH Mus musculus (house mouse) IGHV5-9-3*01, IGHJ1*01, IGHJ1*02 V-DOMAIN VH IG FV-HEAVY_KAPPA IMGT (202640-0)

SAbDab Antibody Annotation SAbDab Database Homepage

ChainChain ClassChain SubclassChain TypeAntigen Name(s) Provenance Source
C, F
Light ChainIGKV4 Kappabcla proteinSAbDab (2026-10-16)
B, E
Heavy ChainIGHV5 -bcla proteinSAbDab (2026-10-16)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, D
PF18573BclA C-terminal domain (BclA_C)BclA C-terminal domainThis is the C-terminal domain of BclA (Bacillus collagen-like protein of anthracis) which is expressed on spores of Bacillus species. Trimers of the C-terminal domain (CTD) form the tips of the spore's hair-like nap and are the immunodominant target ...This is the C-terminal domain of BclA (Bacillus collagen-like protein of anthracis) which is expressed on spores of Bacillus species. Trimers of the C-terminal domain (CTD) form the tips of the spore's hair-like nap and are the immunodominant target of vertebrate antibodies and drive trimerization [1]. Structure analysis indicate the C-terminal region of the peptide folding into an all-beta structure with a jelly-fold topology, similar to the first human complement C1q, a member of the tumor necrosis factor (TNF)-like family. The C-terminal globular domain has been shown to be located on the exterior of the exosporium, and therefore is critical in determining the immunogenicity of the spore in a mammalian host [2].
Domain
C, F
PF07686Immunoglobulin V-set domain (V-set)Immunoglobulin V-set domainThis domain is found in antibodies as well as neural protein P0 and CTL4 amongst others. Domain
B, E
PF07686Immunoglobulin V-set domain (V-set)Immunoglobulin V-set domainThis domain is found in antibodies as well as neural protein P0 and CTL4 amongst others. Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, D
BclA protein
C, F
antibody ScFv fragment, light chain- - -
B, E
antibody ScFv fragment, heavy chain