Comparative Studies of Enzymes Related to Serine Metabolism in Higher Plants

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Abstract
The following enzymes related to serine metabolism in higher plants have been investigated: 1) d-3-phosphoglycerate dehydrogenase, 2) phosphohydroxypyruvate:l-glutamate transaminase, 3) d-glycerate dehydrogenase, and 4) hydroxypyruvate:l-alanine transaminase. Comparative studies on the distribution of the 2 dehydrogenases in seeds and leaves from various plants revealed that d-3-phosphoglycerate dehydrogenase is widely distributed in seeds in contrast to d-glycerate dehydrogenase, which is either absent or present at low levels, and that the reverse pattern is observed in green leaves.