1mj4
Crystal Structure Analysis of the cytochrome b5 domain of human sulfite oxidase
Structural highlights
DiseaseSUOX_HUMAN Defects in SUOX are the cause of isolated sulfite oxidase deficiency (ISOD) [MIM:272300; also known as sulfocysteinuria. ISOD is characterized by neurological abnormalities including multicystic leukoencephalopathy with brain atrophy. Patients often suffer from seizures. Often leads to death at an early age.[1] [2] [3] [4] [5] FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe molybdenum- and iron-containing enzyme sulfite oxidase catalyzes the physiologically vital oxidation of sulfite to sulfate. Sulfite oxidase contains three domains: an N-terminal cytochrome b(5) domain, a central domain harboring the molybdenum cofactor (Moco) and a C-terminal dimerization domain. Oxidation of the substrate sulfite is coupled to the transfer of two electrons to the molybdenum cofactor. Subsequently, these electrons are passed on, one at a time, to the b(5) heme of sulfite oxidase and from there to the soluble electron carrier cytochrome c. The crystal structure of the oxidized human sulfite oxidase cytochrome b(5) domain has been determined at 1.2 A resolution and has been refined to a crystallographic R factor of 0.107 (R(free) = 0.137). A comparison of this structure with other b(5)-type cytochromes reveals distinct structural features present in the sulfite oxidase b(5) domain which promote optimal electron transport between the Moco of sulfite oxidase and the heme of cytochrome c. The 1.2 A structure of the human sulfite oxidase cytochrome b(5) domain.,Rudolph MJ, Johnson JL, Rajagopalan KV, Kisker C Acta Crystallogr D Biol Crystallogr. 2003 Jul;59(Pt 7):1183-91. Epub 2003, Jun 27. PMID:12832761[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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