Cloned (Comment) | Organism |
---|---|
gene sqr, DNA and amino acid sequence determination and analysis, sequence comparisons, quantitative real-time RT-PCR expression analysis, recombinant expression of N- and C-terminally His-tagged enzyme in Escherichia coli strain BL21 in inclusion bodies | Sinonovacula constricta |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
mitochondrion | ScSQR is located only in the mitochondria, no signal peptide is found | Sinonovacula constricta | 5739 | - |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
hydrogen sulfide + glutathione + ubiquinone | Sinonovacula constricta | - |
S-sulfanylglutathione + ubiquinol | - |
ir |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Sinonovacula constricta | A0A6B9CM12 | - |
- |
Posttranslational Modification | Comment | Organism |
---|---|---|
glycoprotein | three putative glycosylation sites (NNTV, NISY, NTSL) are predicted | Sinonovacula constricta |
Purification (Comment) | Organism |
---|---|
recombinant His-tagged enzyme from Escherichia coli strain BL21 by nickel affinity chromatography from inclusion bodies. Native enzyme partially from gills by purification of mitochondria | Sinonovacula constricta |
Source Tissue | Comment | Organism | Textmining |
---|---|---|---|
gill | - |
Sinonovacula constricta | - |
liver | - |
Sinonovacula constricta | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
hydrogen sulfide + glutathione + ubiquinone | - |
Sinonovacula constricta | S-sulfanylglutathione + ubiquinol | - |
ir |
Subunits | Comment | Organism |
---|---|---|
? | x * 56000, recombinant His-tagged enzyme SDS-PAGE | Sinonovacula constricta |
Synonyms | Comment | Organism |
---|---|---|
ScSQR | - |
Sinonovacula constricta |
SQR | - |
Sinonovacula constricta |
sulfide:quinone oxidoreductase | - |
Sinonovacula constricta |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
FAD | the deduced ScSQR protein contains conserved FAD-binding domains, comprising residues 32-59, 121-134, and 306-331 | Sinonovacula constricta | |
ubiquinone | - |
Sinonovacula constricta |
Organism | Comment | Expression |
---|---|---|
Sinonovacula constricta | enzyme expression is induced by 0.15 mM sulfide. In the gill, the expression level of ScSQR increases significantly and shows a time-dependent pattern. In addition, under sulfide stress, the expression level of the gill is higher than that of liver, overview | up |
General Information | Comment | Organism |
---|---|---|
additional information | the deduced ScSQR protein contains conserved FAD-binding domains, two cysteine residues (C190 and C371), two histidines (H68 and H282), and one glutamic acid (E147), which are the essential elements for the catalytic mechanism of SQR | Sinonovacula constricta |
physiological function | due to the little exchange of seawater and to anoxic conditions, Sinonovacula constricta is exposed to considerable amounts of sulfide during low tide, but exhibits strong sulfide tolerance. Mitochondrial sulfide oxidation is a particular defense strategy against sulfide toxicity of sulfide-tolerant organisms, for which sulfide:quinone oxidoreductase (SQR) is the first key enzyme. In order to investigate the mechanism of sulfide tolerance including ScSQR. Th enzyme has an important role in protecting cells from sulfide stress by participating in mitochondrial sulfide detoxification, it catalyzes electron transfer from sulfide to ubiquinone through the FAD cofactor | Sinonovacula constricta |