Regulation of Glycine Decarboxylase and l-Serine Hydroxymethyltransferase Activities by Glyoxylate in Tobacco Leaf Mitochondrial Preparations

Peterson, R.B.

Plant Physiology 70(1): 61-66


ISSN/ISBN: 0032-0889
PMID: 16662480
DOI: 10.1104/pp.70.1.61
Accession: 001117248

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Glyoxylate inhibited the decarboxylation of glycine and synthesis of serine in isolated tobacco leaf mitochondria. The reverse reaction was also controlled by glyoxylate by regulation of the activity of l-serine hydroxymethyltransferase. At levels of glyoxylate <10 mm, the activity of this enzyme was enhanced, but it was inhibited by >10 mm glyoxylate. The results are discussed in relation to the metabolic regulation of photorespiration.