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貨期:
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用途:
For Research Use Only. Not for use in diagnostic or therapeutic procedures.
Plays a central role in 2-thiolation of mcm(5)S(2)U at tRNA wobble positions of cytosolic tRNA(Lys), tRNA(Glu) and tRNA(Gln). Also essential during biosynthesis of the molybdenum cofactor. Acts by mediating the C-terminal thiocarboxylation of sulfur carriers URM1 and MOCS2A. Its N-terminus first activates URM1 and MOCS2A as acyl-adenylates (-COAMP), then the persulfide sulfur on the catalytic cysteine is transferred to URM1 and MOCS2A to form thiocarboxylation (-COSH) of their C-terminus. The reaction probably involves hydrogen sulfide that is generated from the persulfide intermediate and that acts as nucleophile towards URM1 and MOCS2A. Subsequently, a transient disulfide bond is formed. Does not use thiosulfate as sulfur donor; NFS1 probably acting as a sulfur donor for thiocarboxylation reactions.
基因功能參考文獻:
This observation should encourage testing of additional intellectual disability patients with mild abnormalities of sulfite metabolism for MOCS3 mutations. PMID: 28544736
Among the associated variants were two in regions previously unreported for COPD; a low frequency non-synonymous SNP in MOCS3 (rs7269297, pdiscovery=3.08x10(-6), preplication=0.019) and a rare SNP in IFIT3, which emerged in the meta-analysis (rs140549288, pmeta=8.56x10(-6)). PMID: 26917578
ubiquitin-like Urm1.Uba4 systems are conserved and exchangeable between human and yeast cells PMID: 25747390
extension of the C terminus with an additional glycine of MOCS2A and URM1 altered the localization of MOCS3 from the cytosol to the nucleus. PMID: 22453920
MOCS3 protein is believed to catalyze both the adenylation and the subsequent generation of a thiocarboxylate group at the C terminus of the smaller subunit of molybdopterin synthase PMID: 15073332
Electrospray ionization mass spectrometry performed on a rhodanese-like carboxyl-terminal domain of human MOCS3 provides direct evidence for the formation of persulfide on cysteine residue 412. PMID: 15910006
in humans & most eukaryotes thiosulfate is not physiologic sulfur donor for MOCS3, whereas in bacterial homologs, which have arginine at last position of active site loop, thiosulfate can be used as a sulfur source for molybdenum cofactor biosynthesis. PMID: 17459099
The UBA4-URM1 system represents the evolutionary link between protein conjugation and protein modification by sulfur carrier proteins. PMID: 18491921
Nfs1 acts as a sulfur donor for MOCS3, a protein involved in molybdenum cofactor biosynthesis PMID: 18650437