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J. Biol. Chem., Vol. 260, Issue 10, 5913-5918, 05, 1985

L-Threonine dehydrogenase from goat liver. Feedback inhibition by methylglyoxal

M Ray and S Ray

L-Threonine dehydrogenase, which forms aminoacetone from L-threonine and NAD, has been extensively purified from goat liver. A feedback inhibition of this enzyme has been observed with methylglyoxal. Kinetic data and other experiments indicate that methylglyoxal acts at a site other than the active site of the enzyme. The enzyme contains a single subunit of Mr 89,000. The apparent Km values of the enzyme for L- threonine and NAD were found to be 5.5 and 1 mM, respectively.
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