Annotations: 2RN4

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	beta-Barrel protease inhibitors	8034426	3001476	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)
A	PF02974	e2rn4A1	A: beta barrels	X: Lipocalins/Streptavidin	H: Metalloprotease inhibitor (From Topology)	T: Metalloprotease inhibitor	F: PF02974	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.40.128.10	Mainly Beta	Beta Barrel	Lipocalin		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF02974	Protease inhibitor Inh (Inh)	Protease inhibitor Inh	The Inh inhibitor is secreted into the periplasm where its presumed physiological function is to protect periplasmic proteins against the action of secreted proteases [1]. A range of proteases including A, B and C from E. chrysanthemi, alkaline prote ...	The Inh inhibitor is secreted into the periplasm where its presumed physiological function is to protect periplasmic proteins against the action of secreted proteases [1]. A range of proteases including A, B and C from E. chrysanthemi, alkaline protease from Pseudomonas aeruginosa and the 50 kDa protease from Serratia marcescens are inhibited.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Proteinase inhibitor	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity metalloendopeptidase inhibitor activity endopeptidase inhibitor activity	-	periplasmic space cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR021140	Alkaline proteinase inhibitor/ Outer membrane lipoprotein Omp19	Domain
A	IPR022815	Protease inhibitor	Family
A	IPR016085	Protease inhibitor, beta-barrel domain	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 R01GM133198.