4AQ1 | pdb_00004aq1

Structure of the SbsB S-layer protein of Geobacillus stearothermophilus PV72p2 in complex with nanobody KB6

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody 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)
D	d4aq1d1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	LLAMA (Lama glama ) [TaxId: 9844 ],	SCOPe (2.08)
D	d4aq1d2	Artifacts	Tags	Tags	Tags	C-terminal Tags	LLAMA (Lama glama ) [TaxId: 9844 ],	SCOPe (2.08)
B	d4aq1b1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	LLAMA (Lama glama ) [TaxId: 9844 ],	SCOPe (2.08)
B	d4aq1b2	Artifacts	Tags	Tags	Tags	C-terminal Tags	LLAMA (Lama glama ) [TaxId: 9844 ],	SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Evr1_Alr	e4aq1A1	A: a/b three-layered sandwiches	X: HTH	H: SH3	T: SH3	F: Evr1_Alr	ECOD (v294.1)
D	Cathelicidins	e4aq1D1	A: a/b three-layered sandwiches	X: beta-Grasp	H: Ubiquitin-related	T: Ubiquitin-like	F: Cathelicidins	ECOD (v294.1)
B		e4aq1B1	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F:	ECOD (v294.1)
C		e4aq1C3	A: a/b three-layered sandwiches	X: Ribonuclease H-like	H: Ribonuclease H-like	T: Ribonuclease H-like	F:	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 (4.3.0)
A	2.60.40.1080	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
A	2.60.40.3440	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
A	2.60.40.3450	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
A	2.60.40.3460	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
D	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)
C	2.60.40.1080	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
C	2.60.40.3440	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
C	2.60.40.3450	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
C	2.60.40.3460	Mainly Beta	Sandwich	Immunoglobulin-like		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
B, D	NBKB6	VH	Lama glama (llama)	IGHV3S101, IGHJ401	V-DOMAIN VH	IG	(VH)	IMGT (202614-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B, D	Heavy Chain	IGHV1	-	-	SAbDab (2026-04-17)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	SBSB PROTEIN	cation binding ion binding binding metal ion binding small molecule binding identical protein binding protein binding	-	-
B, D	NBKB6	-	-	-
C	SBSB PROTEIN	cation binding ion binding binding metal ion binding small molecule binding identical protein binding protein binding	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR014755	Copper resistance protein CopC/internalin, immunoglobulin-like	Homologous Superfamily
A	IPR003343	Bacterial Ig-like domain, group 2	Domain
A	IPR001119	S-layer homology domain	Domain
C	IPR014755	Copper resistance protein CopC/internalin, immunoglobulin-like	Homologous Superfamily
C	IPR003343	Bacterial Ig-like domain, group 2	Domain
C	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.