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  • Title: Malate dehydrogenase isozymes in the longnose dace, Rhinichthys cataractae.
    Author: Starzyk RM, Merritt RB.
    Journal: Biochem Genet; 1980 Aug; 18(7-8):755-64. PubMed ID: 7470020.
    Abstract:
    The interspecies homology of dace supernatant (A2,AB,B2) and mitochondrial (C2) malate dehydrogenase isozymes has been established through cell fractionation and tissue distribution studies. Isolated supernatant malate dehydrogenase (s-MDH) isozymes show significant differences in Michaelis constants for oxaloacetate and in pH optima. Shifts in s-MDH isozyme pH optima with temperature may result in immediate compensation for increase in ectotherm body pH with decrease in temperature, but duplicate s-MDH isozymes are probably maintained through selection for tissue specific regulation of metabolism.
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