4IOS | pdb_00004ios

Structure of phage TP901-1 RBP (ORF49) in complex with nanobody 11.

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 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)
G	d4iosg_	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)
F	d4iosf_	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)
E	d4iose_	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	d4iosd_	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)
H	d4iosh_	All beta proteins	Virus attachment protein globular domain	Virus attachment protein globular domain	Lactophage receptor-binding protein head domain	automated matches	(Lactococcus phage TP901-1 ) [TaxId: 35345 ],	SCOPe (2.08)
C	d4iosc_	All beta proteins	Virus attachment protein globular domain	Virus attachment protein globular domain	Lactophage receptor-binding protein head domain	automated matches	(Lactococcus phage TP901-1 ) [TaxId: 35345 ],	SCOPe (2.08)
B	d4iosb_	All beta proteins	Virus attachment protein globular domain	Virus attachment protein globular domain	Lactophage receptor-binding protein head domain	automated matches	(Lactococcus phage TP901-1 ) [TaxId: 35345 ],	SCOPe (2.08)
A	d4iosa_	All beta proteins	Virus attachment protein globular domain	Virus attachment protein globular domain	Lactophage receptor-binding protein head domain	automated matches	(Lactococcus phage TP901-1 ) [TaxId: 35345 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
H	SCOP2B Superfamily	Virus attachment protein globular domain	8040389	3001376	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Virus attachment protein globular domain	8040389	3001376	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Virus attachment protein globular domain	8040389	3001376	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Virus attachment protein globular domain	8040389	3001376	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
G	V-set_8	e4iosG1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)
F	V-set_8	e4iosF1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)
E	V-set_12	e4iosE1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_12	ECOD (1.6)
D	V-set_8	e4iosD1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_8	ECOD (1.6)
H	Caudo_bapla_RBP_3rd	e4iosH1	A: beta sandwiches	X: Domain in virus attachment proteins (From Topology)	H: Domain in virus attachment proteins (From Topology)	T: Domain in virus attachment proteins	F: Caudo_bapla_RBP_3rd	ECOD (1.6)
C	Caudo_bapla_RBP_3rd	e4iosC1	A: beta sandwiches	X: Domain in virus attachment proteins (From Topology)	H: Domain in virus attachment proteins (From Topology)	T: Domain in virus attachment proteins	F: Caudo_bapla_RBP_3rd	ECOD (1.6)
B	Caudo_bapla_RBP_3rd	e4iosB1	A: beta sandwiches	X: Domain in virus attachment proteins (From Topology)	H: Domain in virus attachment proteins (From Topology)	T: Domain in virus attachment proteins	F: Caudo_bapla_RBP_3rd	ECOD (1.6)
A	Caudo_bapla_RBP_3rd	e4iosA1	A: beta sandwiches	X: Domain in virus attachment proteins (From Topology)	H: Domain in virus attachment proteins (From Topology)	T: Domain in virus attachment proteins	F: Caudo_bapla_RBP_3rd	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
G	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F	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)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
H	2.60.40.1830	Mainly Beta	Sandwich	Immunoglobulin-like	Phage tail base-plate Siphoviridae RBP, head domain	CATH (4.3.0)
C	2.60.40.1830	Mainly Beta	Sandwich	Immunoglobulin-like	Phage tail base-plate Siphoviridae RBP, head domain	CATH (4.3.0)
B	2.60.40.1830	Mainly Beta	Sandwich	Immunoglobulin-like	Phage tail base-plate Siphoviridae RBP, head domain	CATH (4.3.0)
A	2.60.40.1830	Mainly Beta	Sandwich	Immunoglobulin-like	Phage tail base-plate Siphoviridae RBP, head domain	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
D, E, F, G	LLAMA NANOBODY 11	VH	Lama glama (llama)	IGHV3S101, IGHJ401	V-DOMAIN VH	IG	(VH)	IMGT (202542-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D, E, F, G	Heavy Chain	IGHV1	-	bpp	SAbDab (2025-10-31)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, H	PF08931	Lactophage receptor-binding protein C-terminal head domain (Caudo_bapla_RBP)	Lactophage receptor-binding protein C-terminal head domain	Caudo_bapla_RBP is a family of proteins expressed from ORF18 of the Lactococcus P2-like phage. This is one of three protein domains, shoulders, neck, and head, that form the phage tail base-plate. In the overall structure this head domain exists as s ...	Caudo_bapla_RBP is a family of proteins expressed from ORF18 of the Lactococcus P2-like phage. This is one of three protein domains, shoulders, neck, and head, that form the phage tail base-plate. In the overall structure this head domain exists as six trimers, and is necessary for specific recognition of the receptors at the host cell surface. Siphoviridae are the P2-like Caudovirales of Lactococcus [1]. This family now includes DUF1914. Family Baseplate, Pfam:PF16774, is the ORF15 or shoulder component of the base-plate complex.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D, E, F, G	Llama nanobody 11	-	-	-
A, B, C, H	BPP	-	virion attachment to host cell biological process involved in interspecies interaction between organisms adhesion of symbiont to host cell viral process viral life cycle adhesion of symbiont to host biological process involved in interaction with host biological process involved in symbiotic interaction cell adhesion cellular process symbiont entry into host cell symbiont entry into host	virus tail virion component virus tail, baseplate

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, H	IPR008982	Adenovirus pIV-like, attachment domain	Homologous Superfamily
A, B, C, H	IPR015027	Receptor-binding protein of phage tail base-plate Siphoviridae, head	Domain
A, B, C, H	IPR040956	Lower baseplate protein, N-terminal	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.