Annotations: 3AB0

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

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
F	d3ab0f_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
C	d3ab0c_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
E	d3ab0e_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
B	d3ab0b_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
F	FAD_binding_4	e3ab0F1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: FAD_binding_4	ECOD (v295.2)
C	V-set	e3ab0C1	A: alpha arrays	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set	ECOD (v295.2)
E	FAD_binding_4	e3ab0E1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: FAD_binding_4	ECOD (v295.2)
B	V-set	e3ab0B1	A: alpha arrays	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set	ECOD (v295.2)
D	FAD_binding_4	e3ab0D1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: FAD_binding_4	ECOD (v295.2)
A	FAD_binding_4	e3ab0A1	A: alpha arrays	X: Alpha-beta plaits	H: Phage tail protein-like	T: Transmembrane protein 14A	F: FAD_binding_4	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
F	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D	2.60.120.40	Mainly Beta	Sandwich	Jelly Rolls		CATH (4.3.0)
A	2.60.120.40	Mainly Beta	Sandwich	Jelly Rolls		CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
C, F	A4D11 scFv	V-KAPPA	Mus musculus (house mouse)	IGKV4-6101, IGKJ101, IGKJ102, IGKJ201	V-DOMAIN V-KAPPA	IG	FV-HEAVY_KAPPA	IMGT (202633-0)
B, E	A4D11 scFv	VH	Mus musculus (house mouse)	IGHV5-9-301, IGHJ101, IGHJ1*02	V-DOMAIN VH	IG	FV-HEAVY_KAPPA	IMGT (202633-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C, F	Light Chain	IGKV4	Kappa	bcla protein	SAbDab (2026-08-28)
B, E	Heavy Chain	IGHV5	-	bcla protein	SAbDab (2026-08-28)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C, F	PF07686	Immunoglobulin V-set domain (V-set)	Immunoglobulin V-set domain	This domain is found in antibodies as well as neural protein P0 and CTL4 amongst others.	Domain
B, E	PF07686	Immunoglobulin V-set domain (V-set)	Immunoglobulin V-set domain	This domain is found in antibodies as well as neural protein P0 and CTL4 amongst others.	Domain
A, D	PF18573	BclA C-terminal domain (BclA_C)	BclA C-terminal domain	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 ...	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

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C, F	antibody ScFv fragment, light chain	-	response to stimulus immune response immune system process adaptive immune response	protein-containing complex immunoglobulin complex
B, E	antibody ScFv fragment, heavy chain	binding antigen binding	adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus immune response immune system process B cell mediated immunity leukocyte mediated immunity immunoglobulin mediated immune response adaptive immune response immune effector process	protein-containing complex immunoglobulin complex cellular anatomical structure extracellular region
A, D	BclA protein	structural molecule activity extracellular matrix structural constituent extracellular matrix structural constituent conferring tensile strength	cellular component organization extracellular matrix organization cellular process cellular component organization or biogenesis extracellular structure organization external encapsulating structure organization import into cell regulation of localization regulation of biological process regulation of cellular component organization regulation of cellular process transport regulation of transport biological regulation cellular component organization extracellular matrix organization cellular process cellular component organization or biogenesis extracellular structure organization external encapsulating structure organization import into cell regulation of localization regulation of biological process regulation of cellular component organization regulation of cellular process transport regulation of transport biological regulation regulation of phagocytosis establishment of localization localization phagocytosis endocytosis regulation of endocytosis	extracellular matrix cellular anatomical structure external encapsulating structure extracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C, F	IPR050150	Immunoglobulin Variable Light Chain	Family
C, F	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
C, F	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
C, F	IPR013106	Immunoglobulin V-set domain	Domain
C, F	IPR003599	Immunoglobulin domain subtype	Domain
C, F	IPR007110	Immunoglobulin-like domain	Domain
B, E	IPR050199	Immunoglobulin Heavy Variable	Family
B, E	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
B, E	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
B, E	IPR013106	Immunoglobulin V-set domain	Domain
B, E	IPR007110	Immunoglobulin-like domain	Domain
A, D	IPR008160	Collagen triple helix repeat	Repeat
A, D	IPR021201	Leader peptide, exosporium	Domain
A, D	IPR008983	Tumour necrosis factor-like domain superfamily	Homologous Superfamily
A, D	IPR050149	Collagen_superfamily	Unknown
A, D	IPR041415	BclA, C-terminal domain	Domain

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.