Annotations: 8DCN

Crystal structure of Clostridioides difficile binary toxin CDTb D4 fragment in complex with BINTOXB/9 Fab

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
E		e8dcnE1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F:	ECOD (v295.2)
B		e8dcnB1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F:	ECOD (v295.2)
D		e8dcnD1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F:	ECOD (v295.2)
A		e8dcnA1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F:	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
E	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B, E	Light Chain	IGKV8	Kappa	adp-ribosylating binary toxin binding subunit cdtb	SAbDab (2026-10-02)
A, D	Heavy Chain	IGHV1	-	adp-ribosylating binary toxin binding subunit cdtb	SAbDab (2026-10-02)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C, F	ADP-ribosylating binary toxin binding subunit CdtB	identical protein binding protein binding binding	cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein complex oligomerization protein-containing complex assembly protein homooligomerization cellular process cellular component organization or biogenesis	cellular anatomical structure extracellular region
B, E	BINTOXB/9 Fab light chain	-	-	-
A, D	BINTOXB/9 Fab heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C, F	IPR035331	Clostridial binary toxin B/anthrax toxin PA, domain 3	Domain
C, F	IPR011658	PA14 domain	Domain
C, F	IPR027439	Protective antigen, heptamerisation domain	Domain
C, F	IPR035088	Protective antigen, Ca-binding domain	Domain
C, F	IPR037149	Protective antigen, heptamerisation domain superfamily	Homologous Superfamily
C, F	IPR003896	Bacterial exotoxin B	Family