title: Glucose-6-phosphate dehydrogenase from a tetracycline producing strain of Streptomyces aureofaciens: some properties and regulatory aspects of the enzyme.
abstract: Glucose-6-phosphate dehydrogenase from Streptomyces aureofaciens exhibited activity with both NAD and NADP, the maximum reaction rate being 1.6 times higher for NAD-linked activity than for the NADP-linked one. The KM values for NAD-linked activity were 2.5 mM for glucose-6-phosphate and 0.27 mM for NAD, and for NADP-linked activity 0.8 mM for glucose-6-phosphate and 0.08 mM for NADP. NAD- and NADP-linked activities were inhibited by both NADH and NADPH. (2'-phospho-)adenosinediphospho-ribose inhibited only NAD-linked activity. The inhibition was competitive with respect to NAD and noncompetitive with respect to glucose-6-phosphate.
mesh_terms: D002413:Cations, Divalent / Q000494:pharmacology; D004789:Enzyme Activation / Q000187:drug effects; D005954:Glucosephosphate Dehydrogenase / Q000037:antagonists & inhibitors / Q000302:isolation & purification* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009243:NAD / Q000378:metabolism; D009249:NADP / Q000378:metabolism; D013304:Streptomyces aureofaciens / Q000201:enzymology* / Q000378:metabolism; D013752:Tetracycline / Q000096:biosynthesis*
chemical_list: D002413:Cations, Divalent; D009243:NAD; D009249:NADP; D005954:Glucosephosphate Dehydrogenase; D013752:Tetracycline