Annotations: 2RRL

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Flg_hook	e2rrlA1	A: a+b two layers	X: C-terminal domain of FliK (From Topology)	H: C-terminal domain of FliK (From Topology)	T: C-terminal domain of FliK	F: Flg_hook	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.750.140	Alpha Beta	2-Layer Sandwich	Transcription Regulator spoIIAA		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF02120	Flagellar hook-length control protein FliK (Flg_hook)	Flagellar hook-length control protein FliK	This is the C terminal domain of FliK. FliK controls the length of the flagellar hook by directly measuring the hook length as a molecular ruler [1]. This family also includes YscP of the Yersinia type III secretion system, and equivalent proteins i ...	This is the C terminal domain of FliK. FliK controls the length of the flagellar hook by directly measuring the hook length as a molecular ruler [1]. This family also includes YscP of the Yersinia type III secretion system, and equivalent proteins in other pathogenic bacterial type III secretion systems.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Flagellar hook-length control protein	-	organelle assembly cell projection organization bacterial-type flagellum assembly membraneless organelle assembly cellular component biogenesis cellular component organization bacterial-type flagellum organization organelle organization cellular component assembly cellular process cellular component organization or biogenesis cell projection assembly	cell projection cellular anatomical structure bacterial-type flagellum hook organelle membraneless organelle bacterial-type flagellum

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR001635	Flagellar hook-length control protein FliK	Family
A	IPR052563	Flagellar hook-length control	Family
A	IPR021136	Flagellar hook-length control protein-like, C-terminal	Domain
A	IPR038610	FliK-like, C-terminal domain superfamily	Homologous Superfamily

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.