title: Soybean L-(+)-lactate dehydrogenases: purification, characterization, and resolution of subunit structure.
abstract: Lactate dehydrogenase (LDH) (EC 1.1.1.27) from soybean (Glycine max) was purified 2360-fold to homogeneity using ion-exchange, hydroxyapatite, affinity, and hydrophobic chromatographies. The molecular weight of the holoenzyme is 150,000 +/- 5000. Two-dimensional (isoelectrofocusing-sodium dodecyl sulfate) gel electrophoresis reveals two polypeptides subunits of 5.9 and 6.5 pI and of 36,000 +/- 1000 and 37,000 +/- 1000 Mr, respectively. Nondissociating electrophoresis and isoelectric focusing of LDH resolved five tetrameric isoenzymes with pI's between 6.0 and 6.5. The data suggest that these LDH isoenzymes are derived from random association of the products of two different, but most probably related, genes. Kinetic measurements revealed substrate inhibition at high concentrations of lactic acid and biphasic kinetics with NAD.
authors: Département de Microbiologie, Faculté de Médecine, Université de Sherbrooke, Québec, Canada.
authors: K
authors: K
authors: Tihanyi
authors: A
authors: A
authors: Fontanell
authors: B
authors: B
authors: Talbot
authors: J P
authors: JP
authors: Thirion
mesh_terms: D015180:Electrophoresis, Gel, Two-Dimensional; D004591:Electrophoresis, Polyacrylamide Gel; D004795:Enzyme Stability; D007527:Isoenzymes / Q000302:isolation & purification* / Q000378:metabolism; D007700:Kinetics; D007770:L-Lactate Dehydrogenase / Q000302:isolation & purification* / Q000378:metabolism; D015394:Molecular Structure; D008970:Molecular Weight; D010940:Plant Proteins / Q000302:isolation & purification; D013025:Glycine max / Q000201:enzymology*; D013379:Substrate Specificity
chemical_list: D007527:Isoenzymes; D010940:Plant Proteins; D007770:L-Lactate Dehydrogenase