6QX4 | pdb_00006qx4

Structure of the Bacillus anthracis Sap S-layer assembly domain

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Protein Family 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)
D	Csx1_CARF	e6qx4D1	A: a/b three-layered sandwiches	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: Csx1_CARF	ECOD (v294.1)
F [auth H]	Ycf9	e6qx4H1	A: a/b three-layered sandwiches	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: Ycf9	ECOD (v294.1)
C	Csx1_CARF	e6qx4C1	A: a/b three-layered sandwiches	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: Csx1_CARF	ECOD (v294.1)
E	Ycf9	e6qx4E1	A: a/b three-layered sandwiches	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: Ycf9	ECOD (v294.1)
A	Csx1_CARF	e6qx4A1	A: a/b three-layered sandwiches	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: Csx1_CARF	ECOD (v294.1)
B	Ycf9	e6qx4B1	A: a/b three-layered sandwiches	X: Ten stranded beta/alpha barrel	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: Ycf9	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.60.40.1220	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (utative)
B	2.60.40.1220	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D, F [auth H]	Heavy Chain	IGHV3	-	s-layer protein sap	SAbDab (2026-03-27)
C, E	Heavy Chain	IGHV1	-	s-layer protein sap	SAbDab (2026-03-27)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF02368	Bacterial Ig-like domain (group 2) (Big_2)	Bacterial Ig-like domain (group 2)	This family consists of bacterial domains with an Ig-like fold. Members of this family are found in bacterial and phage surface proteins such as intimins.	Domain
A, B	PF13205	Bacterial Ig-like domain (Big_5)	Bacterial Ig-like domain		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D, F [auth H]	Nanobody NbAF694	-	-	-
C, E	Nanobody NbAF683	-	-	-
A, B	S-layer protein sap	-	-	cellular anatomical structure external encapsulating structure extracellular region S-layer

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR051465	Cell Envelope Structural Component	Family
A, B	IPR014755	Copper resistance protein CopC/internalin, immunoglobulin-like	Homologous Superfamily
A, B	IPR032812	SbsA, Ig-like domain	Domain
A, B	IPR003343	Bacterial Ig-like domain, group 2	Domain
A, B	IPR008964	Invasin/intimin cell-adhesion fragments	Homologous Superfamily
A, B	IPR001119	S-layer homology domain	Domain

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.