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the first two enzymes of the molybdopterin biosynthesis pathway are encoded by the MOCS1 locus in humans. Isoform MOCS1A and isoform MOCS1B form a complex that catalyzes the conversion of 5'-GTP to cyclic pyranopterin monophosphate. They are encoded by an apparently bicistronic MOCS1AMOCS1B transcript which bypasses the normal termination nonsense codon of MOCS1A resulting in fusion of the MOCS1A and MOCS1B open reading frames. The bicistronic form of MOCS1 mRNA is likely to only produce MOCS1A protein and suggests that MOCS1B is translated only as a fusion with MOCS1A
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