5mpo

Structural highlights

Disease

[MOC2A_HUMAN] Sulfite oxidase deficiency due to molybdenum cofactor deficiency type B. The disease is caused by mutations affecting the gene represented in this entry. [MOC2B_HUMAN] Molybdenum cofactor deficiency type B (MOCOD type B) [MIM:252150]: Autosomal recessive disease which leads to the pleiotropic loss of all molybdoenzyme activities and is characterized by severe neurological damage, neonatal seizures and early childhood death. Note=The disease is caused by mutations affecting the gene represented in this entry.

Function

[MOC2A_HUMAN] Acts as a sulfur carrier required for molybdopterin biosynthesis. Component of the molybdopterin synthase complex that catalyzes the conversion of precursor Z into molybdopterin by mediating the incorporation of 2 sulfur atoms into precursor Z to generate a dithiolene group. In the complex, serves as sulfur donor by being thiocarboxylated (-COSH) at its C-terminus by MOCS3. After interaction with MOCS2B, the sulfur is then transferred to precursor Z to form molybdopterin.[HAMAP-Rule:MF_03051]^[1] [MOC2B_HUMAN] Catalytic subunit of the molybdopterin synthase complex, a complex that catalyzes the conversion of precursor Z into molybdopterin. Acts by mediating the incorporation of 2 sulfur atoms from thiocarboxylated MOCS2A into precursor Z to generate a dithiolene group.^{[2] [3]}

References

1. ↑ Leimkuhler S, Freuer A, Araujo JA, Rajagopalan KV, Mendel RR. Mechanistic studies of human molybdopterin synthase reaction and characterization of mutants identified in group B patients of molybdenum cofactor deficiency. J Biol Chem. 2003 Jul 11;278(28):26127-34. Epub 2003 May 5. PMID:12732628 doi:10.1074/jbc.M303092200
2. ↑ Leimkuhler S, Freuer A, Araujo JA, Rajagopalan KV, Mendel RR. Mechanistic studies of human molybdopterin synthase reaction and characterization of mutants identified in group B patients of molybdenum cofactor deficiency. J Biol Chem. 2003 Jul 11;278(28):26127-34. Epub 2003 May 5. PMID:12732628 doi:10.1074/jbc.M303092200
3. ↑ Matthies A, Rajagopalan KV, Mendel RR, Leimkuhler S. Evidence for the physiological role of a rhodanese-like protein for the biosynthesis of the molybdenum cofactor in humans. Proc Natl Acad Sci U S A. 2004 Apr 20;101(16):5946-51. Epub 2004 Apr 8. PMID:15073332 doi:10.1073/pnas.0308191101