title: Partial purification, substrate specificity and regulation of alpha-L-glycerolphosphate dehydrogenase from Saccharomyces carlsbergensis.
abstract: alpha-L-Glycerolphosphate dehydrogenase (sn-glycerol-3-phosphate:NAD+ 2-oxidoreductase, EC 1.1.1.8) from Saccharomyces carlsbergensis was purified 400-fold. The enzyme preparation is free of interfering activities, such as glyceraldehyde phosphate dehydrogenase, alcohol dehydrogenase, triose phosphate isomerase and glycerolphosphatase. At pH 7.0 it is specific for NADH (Km = 0.027 mM with 0.8 mM dihydroxyacetone phosphate) and dihydroxyacetone phosphate (Km = 0.2 mM with 0.2 mM NADH). Between pH 5.0 and 6.0 the enzyme functions with NADPH, but only at 7% of the rate with NADH. Various anions (I- greater than SO42- greater than Br- greater than Cl-) act as inhibitors competing with the substrate dihydroxyacetone phosphate. Inorganic phosphate (Ki = 0.1 mM), pyrophosphate and arsenate are strong inhibitors. The nucleotides ATP and ADP are also inhibitory, but their action seems to be of the same type as the general anion competition (Ki = 0.73 mM for ATP). The results are consistent with the notion that the enzyme may regulate the redox potential of the NAD+/NADH couple during fermentation.
mesh_terms: D000227:Adenine Nucleotides / Q000494:pharmacology; D004099:Dihydroxyacetone Phosphate; D005993:Glycerolphosphate Dehydrogenase / Q000037:antagonists & inhibitors / Q000302:isolation & purification / Q000378:metabolism*; D007477:Ions; D007700:Kinetics; D009243:NAD; D012440:Saccharomyces / Q000201:enzymology*; D013379:Substrate Specificity
chemical_list: D000227:Adenine Nucleotides; D007477:Ions; D009243:NAD; D004099:Dihydroxyacetone Phosphate; D005993:Glycerolphosphate Dehydrogenase