1QV0 | pdb_00001qv0

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)

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	EF-hand	8032758	3001983	SCOP2B (2022-06-29)

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	EF-hand_1, EF-hand_6, EF-hand_7	e1qv0A1	A: beta barrels	X: EF-hand	H: EF-hand-related	T: EF-hand	F: EF-hand_1, EF-hand_6, EF-hand_7	ECOD (v294.2)

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)

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	-

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

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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.