Annotations: 1QV0

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1qv0a_	All alpha proteins	EF Hand-like	EF-hand	Calmodulin-like	Calcium-regulated photoprotein	(Obelia longissima ) [TaxId: 32570 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	EF-hand	8032758	3001983	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	EF-hand_7_2	e1qv0A2	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_2	ECOD (1.6)
A	EF-hand_7_1	e1qv0A1	A: alpha arrays	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_7_1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.238.10	Mainly Alpha	Orthogonal Bundle	Recoverin	domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF13202	EF hand (EF-hand_5)	EF hand		Domain
A	PF13499	EF-hand domain pair (EF-hand_7)	EF-hand domain pair		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Obelin	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding	bioluminescence metabolic process cellular process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR018247	EF-Hand 1, calcium-binding site	Binding Site
A	IPR002048	EF-hand domain	Domain
A	IPR011992	EF-hand domain pair	Homologous Superfamily
A	IPR050145	Centrin/CML-like	Family

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	Renilla-luciferin 2-monooxygenase M-CSA #768	Oblein, a protein from the bio-luminescent hydroid, Obleia longissima, is a calcium-regulated photoprotein. The addition of calcium regulates, but is not necessary for bio-luminescence and there is no requirement for an additional substrate (e.g. molecular oxygen). Calcium-regulated photoproteins are found in and are responsible for the light emission of a variety of bio-luminescent marine organisms, mostly coelenterates. Obelin consists of a single polypeptide chain to which the substrate, 2-hydroxy-coelenterazine is tightly, but not covalently bound. Calcium binding results in blue bio-luminescence via oxidative carboxylation of the substrate to the excited state coelenteramide product through several intermediates.	Defined by 5 residues: HIS:A-22TRP:A-92TYR:A-138HIS:A-175TYR:A-190 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 1.13.12.5 (PDB Primary Data) Search M-CSA Motif + EC 1.13.12.5

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.