[Lactate as competitive inhibitor of Pinus pinea isocitrate lyase]. 1995

F Ranaldi, and C Iacoviello, and P Vanni
Département des Sciences Biochimiques, Université de Florence, Italie.

We studied the effect of L-lactate on both the cleavage and the condensation reactions of Pinus pinea isocitrate lyase. This compound is a competitive of Pinus pinea isocitrate lyase towards both isocitrate and glyoxylate, whereas is a mixed type inhibitor towards succinate. Assuming that L-lactate acts as a glyoxylate analogue, our finding agrees with an uni-bi ordered mechanism of isocitrate lyase, with glyoxylate first substrate to enter the active site in the condensation reaction. Results are discussed and compared with those known in the literature about other structurally related metabolites.

UI MeSH Term Description Entries
D007522 Isocitrate Lyase A key enzyme in the glyoxylate cycle. It catalyzes the conversion of isocitrate to succinate and glyoxylate. EC 4.1.3.1. Isocitrase,Isocitratase,Lyase, Isocitrate
D007773 Lactates Salts or esters of LACTIC ACID containing the general formula CH3CHOHCOOR.
D001667 Binding, Competitive The interaction of two or more substrates or ligands with the same binding site. The displacement of one by the other is used in quantitative and selective affinity measurements. Competitive Binding
D014197 Trees Woody, usually tall, perennial higher plants (Angiosperms, Gymnosperms, and some Pterophyta) having usually a main stem and numerous branches. Tree

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