3H8I | pdb_00003h8i

The first X-ray structure of a sulfide:quinone oxidoreductase: Insights into sulfide oxidation mechanism

External Resource: Annotation


Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
Ae3h8iA5 A: DEATH domainX: Ten stranded beta/alpha barrelH: Ten stranded beta/alpha barrelT: Pyr_redox_dimF:ECOD (20:10:01)
Ae3h8iA2 A: gH main domainX: gH main domainH: gH main domainT:F:ECOD (20:10:01)
Be3h8iB5 A: DEATH domainX: Ten stranded beta/alpha barrelH: Ten stranded beta/alpha barrelT: Amino_oxidaseF:ECOD (20:10:01)
Be3h8iB2 A: Carbon-nitrogen hydrolase-likeX: Carbon-nitrogen hydrolaseH: Carbon-nitrogen hydrolaseT: CN_hydrolaseF:ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.50.50.60 Alpha Beta 3-Layer(bba) Sandwich FAD/NAD(P)-binding domain FAD/NAD(P)-binding domainCATH (4.3.0)
B3.50.50.60 Alpha Beta 3-Layer(bba) Sandwich FAD/NAD(P)-binding domain FAD/NAD(P)-binding domainCATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
NADH oxidase -

InterPro: Protein Family Classification InterPro Database Homepage

ChainsAccessionNameType
A, B
IPR052541Sulfide-quinone oxidoreductaseFamily
A, B
IPR023753FAD/NAD(P)-binding domainDomain
A, B
IPR036188FAD/NAD(P)-binding domain superfamilyHomologous Superfamily

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

ChainsEnzyme NameDescriptionCatalytic Residues
sulfide:quinone oxidoreductase  M-CSA #320

Catalyses the oxidation of sulfides, such as hydrogen sulfide, with the help of a quinone to form sulfur globules. Consecutive reaction cycles lead to the accumulation of a polysulfide product on the active site Cys residues; these products are released when they exceed a critical length, typically as cyclooctasulfur. This is an important step in anoxygenic bacterial photosynthesis.

Defined by 6 residues: CYS:A-129CYS:A-178ASP:A-215CYS:A-350ASP:A-353LYS:A-386
Some residues are not modelled and lack atomic coordinates. Visualization is not available.
Some residues are not modelled and lack atomic coordinates. Structure Motif searching is not available.
EC: 1.6.99.3 (PDB Primary Data)
EC: 1.8.5.4 (UniProt)