3FEW

Structure and Function of Colicin S4, a colicin with a duplicated receptor binding domain

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
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)
A [auth X]	Colicin	e3fewX4	A: alpha arrays	X: Toxins' membrane translocation domains	H: Colicin (From Topology)	T: Colicin	F: Colicin	ECOD (1.6)
A [auth X]	EUF08307	e3fewX2	A: a+b two layers	X: Ribonuclease PH domain 2-like	H: Colicin S4 receptor-binding domain (From Topology)	T: Colicin S4 receptor-binding domain	F: EUF08307	ECOD (1.6)
A [auth X]	EUF08770	e3fewX1	A: extended segments	X: Colicin S4 translocation domain (From Topology)	H: Colicin S4 translocation domain (From Topology)	T: Colicin S4 translocation domain	F: EUF08770	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A [auth X]	4.10.80.380	Few Secondary Structures	Irregular	Rhinovirus 14, subunit 4		CATH (4.3.0)
A [auth X]	3.30.1310.40	Alpha Beta	2-Layer Sandwich	Ybab	Chain: A	CATH (4.3.0)
A [auth X]	1.10.490.30	Mainly Alpha	Orthogonal Bundle	Globin-like	Colicin	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth X]	PF20761	Colicin S4 receptor-binding domain (S4_recptr-bd)	Colicin S4 receptor-binding domain	This domain is found twice in Colicin S4, a toxic protein produced by some strains of Escherichia coli that belongs to the group of pore- forming colicins. This protein interacts specifically with OmpW, OmpF, and the Tol system of E. coli strains tha ...	This domain is found twice in Colicin S4, a toxic protein produced by some strains of Escherichia coli that belongs to the group of pore- forming colicins. This protein interacts specifically with OmpW, OmpF, and the Tol system of E. coli strains that lack the corresponding immunity protein. Colicin S4 is organised into four independent compact domains: a N-terminal translocation domain, a C-terminal activity domain and two nearly identical receptor-binding domains. The central domains, which show the highest variability in sequence and structure, are responsible for binding an outer membrane receptor of the target cell. These domains arose from a recent domain duplication event and form the arms of the Y-shaped structure of the protein. Both consist of a three-stranded antiparallel beta sheet followed by three helices [1, 2].	Domain
A [auth X]	PF01024	Colicin pore forming domain (Colicin)	Colicin pore forming domain	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth X]	Colicin S4	pore-forming activity	biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response response to external stimulus defense response to Gram-negative bacterium response to biotic stimulus defense response to bacterium defense response to other organism response to stress response to bacterium response to external biotic stimulus cellular process disruption of cell in another organism biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response response to external stimulus defense response to Gram-negative bacterium response to biotic stimulus defense response to bacterium defense response to other organism response to stress response to bacterium response to external biotic stimulus cellular process disruption of cell in another organism disruption of anatomical structure in another organism killing of cells of another organism cell killing	membrane cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth X]	IPR048582	Colicin S4-like, receptor-binding domain	Domain
A [auth X]	IPR038283	Channel forming colicin, C-terminal domain superfamily	Homologous Superfamily
A [auth X]	IPR000293	Channel forming colicin, C-terminal cytotoxic	Domain

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.