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.
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Oliver et al. (1990) studied this question.
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