Abstract

A lactate dehydrogenase inhibitor protein is isolated from rabbit skeletal muscle crude mitochondrial fraction. The molecular weight of the inhibitor is approximately 20,000 as determined by size exclusion HPLC. The inhibitor isoelectricpH is 5.3 as determined by agarose or polyacrylamide gel isoelectric focusing. The amino acid composition of the inhibitor is given. The presence of the inhibitor gives an acidic characteristic to the alkaline M4 lactate dehydrogenase isozyme and the lactate dehydrogenase-inhibitor complex is more stable than the enzyme alone.

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