Abstract
Summary
The mutarotase content of kidneys from seven species of freshwater fish was measured and found to be uniformly higher than in nine species of saltwater fish. Kidney levels averaged six times higher whereas other tissues (liver, intestine, spleen, heart, and skeletal muscle) did not differ significantly. Substrate specificity of the fish enzyme (D-glucose, D-galactose, D-xylose, and L-arabinose) was the same as the mammalian enzyme. The K M for enzyme from catfish and toadfish kidney was 12 mM glucose and was significantly less than that for most mammalian kidney enzymes.
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