enzymology Enzymes () are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products. A ...

, an UDP-N-acetylmuramate dehydrogenase () is an enzyme that

catalyzes Catalysis () is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst (). Catalysts are not consumed in the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recyc ...

the chemical reaction :UDP-N-acetyl-alpha-D-muramate + NADP⁺

\rightleftharpoons

UDP-N-acetyl-3-O-(1-carboxyvinyl)-alpha-D-glucosamine + NADPH + H⁺ Thus, the two substrates of this enzyme are UDP-N-acetyl-alpha-D-muramate and NADP⁺, whereas its 3 products are UDP-N-acetyl-3-O-(1-carboxyvinyl)-alpha-D-glucosamine,

NADPH Nicotinamide adenine dinucleotide phosphate, abbreviated NADP or, in older notation, TPN (triphosphopyridine nucleotide), is a cofactor used in anabolic reactions, such as the Calvin cycle and lipid and nucleic acid syntheses, which require NAD ...

, and H⁺. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-CH group of donor with NAD⁺ or NADP⁺ as acceptor. The systematic name of this enzyme class is UDP-N-acetyl-alpha-D-muramate:NADP⁺ oxidoreductase. Other names in common use include MurB reductase, UDP-N-acetylenolpyruvoylglucosamine reductase, UDP-N-acetylglucosamine-enoylpyruvate reductase, UDP-GlcNAc-enoylpyruvate reductase, uridine diphosphoacetylpyruvoylglucosamine reductase, uridine diphospho-N-acetylglucosamine-enolpyruvate reductase, uridine-5'-diphospho-N-acetyl-2-amino-2-deoxy-3-O-lactylglucose:NADP-oxidoreductase. This enzyme participates in

aminosugars metabolism In organic chemistry, an amino sugar (or more technically a 2-amino-2-deoxysugar) is a sugar molecule in which a hydroxyl group has been replaced with an amine group. More than 60 amino sugars are known, with one of the most abundant being ''N''- ...

. It employs one cofactor,

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Structural studies

As of late 2007, 8 structures have been solved for this class of enzymes, with PDB accession codes , , , , , , , and .

References

* * * EC 1.3.1 NADPH-dependent enzymes Flavoproteins Enzymes of known structure {{1.3-enzyme-stub