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The Structure of Human Erythrocyte NADH-cytochrome b5 ReductaseThe Structure of Human Erythrocyte NADH-cytochrome b5 Reductase
Structural highlights
Disease[NB5R3_HUMAN] Recessive hereditary methemoglobinemia type 2;Recessive hereditary methemoglobinemia type 1. The disease is caused by mutations affecting the gene represented in this entry. Function[NB5R3_HUMAN] Desaturation and elongation of fatty acids, cholesterol biosynthesis, drug metabolism, and, in erythrocyte, methemoglobin reduction. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedErythrocyte NADH-cytochrome b(5) reductase reduces methaemoglobin to functional haemoglobin. In order to examine the function of the enzyme, the structure of NADH-cytochrome b(5) reductase from human erythrocytes has been determined and refined by X-ray crystallography. At 1.75 A resolution, the root-mean-square deviations (r.m.s.d.) from standard bond lengths and angles are 0.006 A and 1.03 degrees , respectively. The molecular structure was compared with those of rat NADH-cytochrome b(5) reductase and corn nitrate reductase. The human reductase resembles the rat reductase in overall structure as well as in many side chains. Nevertheless, there is a large main-chain shift from the human reductase to the rat reductase or the corn reductase caused by a single-residue replacement from proline to threonine. A model of the complex between cytochrome b(5) and the human reductase has been built and compared with that of the haem-containing domain of the nitrate reductase molecule. The interaction between cytochrome b(5) and the human reductase differs from that of the nitrate reductase because of differences in the amino-acid sequences. The structures around 15 mutation sites of the human reductase have been examined for the influence of residue substitutions using the program ROTAMER. Five mutations in the FAD-binding domain seem to be related to cytochrome b(5). Structure of human erythrocyte NADH-cytochrome b5 reductase.,Bando S, Takano T, Yubisui T, Shirabe K, Takeshita M, Nakagawa A Acta Crystallogr D Biol Crystallogr. 2004 Nov;60(Pt 11):1929-34. Epub 2004, Oct 20. PMID:15502298[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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