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Glycine metabolism by plant mitochondria
Author(s) -
Oliver David J.,
Neuburger Michel,
Bourguig Jacques,
Douce Roland
Publication year - 1990
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1990.tb00072.x
Subject(s) - serine hydroxymethyltransferase , glycine , glycine cleavage system , biochemistry , serine , mitochondrion , chloroplast , transporter , biology , photosynthesis , enzyme , metabolism , citrate synthase , carboxy lyases , gene , amino acid
The predominant substrate oxidized by plant leaf mitochondria in the light is glycine. These mitochondria have evolved specific mechanisms to support this metabolic function including a glycine/serine transporter, high concentrations of the glycine decarboxylase multienzyme complex (EC 2.1.2.10) and the enzyme serine hydroxymethyltransferase (EC 2.1.2.1), and a high‐capacity, high‐specificity oxaloacetate transporter that shuttles out NADH produced by glycine oxidation. Transcription of the genes for the glycine decarboxylase complex is under both temporal and spatial control and they are expressed predominantly in green leaf tissue. This is an example of an unusual light‐induced mitochondrial protein that responds like the chloroplast enzymes involved in photosynthesis.