Crystal Structure of Nitrite Reductase fromRhodobacter sphaeroides
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چکیده
منابع مشابه
Crystal Structure of Biliverdin Reductase
A heme (Fe-porphyrin complex) is a prosthetic group of hemoproteins such as hemoglobin, myoglobin, cytochromes and so on. In biological systems, the heme is decomposed by two enzymes (hemeoxygenase and biliverdin reductase) and excreted (Fig. 1). Biliverdin reductase (BVR) catalyzes the last step of the heme catabolism, in which the biliverdin is reduced into bilirubin with two electrons from N...
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Nitrite reductase catalyzes the reduction of nitrite to nitric oxide, the first step in denitrification to produce a gaseous product. We have cloned the gene nirK, which encodes the copper-type nitrite reductase from a denitrifying variant of Rhodobacter sphaeroides, strain 2.4.3. The deduced open reading frame has significant identity with other copper-type nitrite reductases. Analysis of the ...
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The structure of a binary complex of dihydropteridine reductase [DHPR; NAD(P)H:6,7-dihydropteridine oxidoreductase, EC 1.6.99.7] with its cofactor, NADH, has been solved and refined to a final R factor of 15.4% by using 2.3 A diffraction data. DHPR is an alpha/beta protein with a Rossmann-type dinucleotide fold for NADH binding. Insertion of an extra threonine residue in the human enzyme is ass...
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The structure of chicken liver dihydrofolate reductase (5,6,7,8-tetrahydrofolate:NADP+ oxidoreductase (EC 1.5.1.3)), in a ternary complex with NADPH and a phenyltriazine inhibitor, has been determined at a nominal resolution of 2.9 A. Overall backbone chain folding is very similar to that observed in Escherichia coli and Lactobacillus casei dihydrofolate reductases. About 70% of the additional ...
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I257E was obtained by site directed mutagenesis of nitrite reductase from Achromobacter cycloclastes. The mutant has no enzyme activity. Its crystal structure determined at 1.65A resolution shows that the side-chain carboxyl group of the mutated residue, Glu257, coordinates with the type 2 copper in the mutant and blocks the contact between the type 2 copper and its solvent channel, indicating ...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations of Crystallography
سال: 2000
ISSN: 0108-7673
DOI: 10.1107/s0108767300025484