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Malate dehydrogenase isozymes in the longnose dace,Rhinichthys cataractae

✍ Scribed by Ruth M. Starzyk; Robert B. Merritt

Book ID: 104784100
Publisher: Springer
Year: 1980
Tongue: English
Weight: 519 KB
Volume: 18
Category: Article
ISSN: 0006-2928
DOI: 10.1007/bf00484591

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✦ Synopsis

The interspecies homology of dace supernatant ( A 2, AB, B2) and mitochondrial (C2) malate dehydrogenase isozymes has been established through cell fractionation a~d 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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