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proteins. Page last changed on 19 Dec 2016.
MOCS3, Uba4, Uba4p
Molybdenum cofactor (MoCo) is necessary for the function of all molybdoenzymes. One of the enzymes required for the biosynthesis of MoCo is molybdopterin synthase (MPT synthase). The protein encoded by this gene adenylates and activates MPT synthase. This gene contains no introns. A pseudogene of this gene is present on chromosome 14. [provided by RefSeq, Jul 2008] (from
Leimkühler et al., Potsdam, Germany. In J Biol Chem, 2015
The studies showed that TUM1 interacts with the l-cysteine desulfurase NFS1 and the rhodanese-like protein MOCS3, suggesting a dual function of TUM1 both in sulfur transfer for the biosynthesis of the molybdenum cofactor, and for the thiolation of tRNA.
Schaffrath et al., Kassel, Germany. In Plos One, 2014
While mutations in subunits of the Elongator complex (Elp1-Elp6), which disable mcm5 side chain formation, or removal of components of the thiolation pathway (Ncs2/Ncs6, Urm1, Uba4) are individually tolerated, the combination of both modification defects has been reported to have lethal effects on Saccharomyces cerevisiae.
The ubiquitin-related modifier Urm1 can be covalently conjugated to lysine residues of other proteins, such as yeast Ahp1 and human MOCS3, through a mechanism involving the E1-like protein Uba4 (MOCS3 in humans).
Camelo Junior et al., Freiburg, Germany. In Brain Dev, 2010
Defects in the synthesis of the molybdenum cofactor are caused by mutations in one of the genes MOCS1, MOCS2, MOCS3 and GEPH and result in combined deficiencies of the enzymes sulfite oxidase, xanthine dehydrogenase and aldehyde oxidase.
Leimkühler et al., Potsdam, Germany. In Febs J, 2007
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.
Johnson et al., Göttingen, Germany. In Hum Mutat, 2003
The cofactor is an unstable reduced pterin with a unique four-carbon side chain, synthesized by a complex pathway that requires the products of at least four different genes (MOCS1, MOCS2, MOCS3, and GEPH).