NCIt definition : Molybdenum cofactor biosynthesis protein 1 (636 aa, 70 kDa) is encoded by the human
MOCS1 gene. This protein plays a role in the conversion of 5'-GTP to cyclic pyranopterin
monophosphate (cPMP).;
NCIt note : Several MOCS1A and MOCS1B isoforms may be produced due to alternative splicing or
independent translation of a bicistronic transcript. The MOCS1B isoform (also called
MOCS1B Type-II) is the canonical form according to UniProt.; The GTP 3',8-cyclase (EC 4.1.99.22; molybdenum cofactor biosynthesis protein A) and
cyclic pyranopterin monophosphate synthase (EC 4.6.1.17; molybdenum cofactor biosynthesis
protein C) activities of molybdenum cofactor biosynthesis protein 1 are likely dependent
on the formation of complexes containing both isoform MOCS1A and isoform MOCS1B. (UniProt);