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Enzymes of serine and glycine metabolism in leaves and non-photosynthetic tissues of Pisum sativum L.

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Abstract

A comparative study is presented of the activities of enzymes of glycine and serine metabolism in leaves, germinated cotyledons and root apices of pea (Pisum sativum L.). Data are given for aminotransferase activities with glyoxylate, hydroxypyruvate and pyruvate, for enzymes associated with serine synthesis from 3-phosphoglycerate and for glycine decarboxylase and serine hydroxymethyltransferase. Aminotransferase activities differ between the tissues in that, firstly, appreciable transamination of serine, hydroxypyruvate and asparagine occurs only in leaf extracts and, secondly, glyoxylate is transaminated more actively than pyruvate in leaf extracts, whereas the converse is true of extracts of cotyledons and root apices. Alanine is the most active amino-group donor to both glyoxylate and hydroxypyruvate. 3-Phosphoglycerate dehydrogenase and glutamate: O-phosphohydroxypyruvate aminotransferase have comparable activities in all three tissues, except germinated cotyledons, in which the aminotransferase appears to be undetectable. Glycollate oxidase is virtually undetectable in the non-photosynthetic tissues and in these tissues the activity of glycerate dehydrogenase is much lower than that of 3-phosphoglycerate dehydrogenase. Glycine decarboxylase activity in leaves, measured in the presence of oxaloacetate, is equal to about 30–40% of the measured rate of CO2 fixation and is therefore adequate to account for the expected rate of photorespiration. The activity of glycine decarboxylase in the non-photosynthetic tissues is calculated to be about 2–5% of the activity in leaves and has the characteristics of a pyridoxal-and tetrahydrofolate-dependent mitochondrial reaction; it is stimulated by oxaloacetate, although not by ADP. In leaves, the measured activity of serine hydroxymethyltransferase is somewhat lower than that of glycine decarboxylase, whereas in root apices it is substantially higher. Differential centrifugation of extracts of root apices suggests that an appreciable proportion of serine hydroxymethyltransferase activity is associated with the plastids.

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Abbreviations

GOGAT:

l-Glutamine:2-oxoglutarate aminotransferase

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  1. N. J. Walton

    Present address: Agricultural and Food Research Council, Food Research Institute-Norwich, Colney Lane, NR4 7UA, Norwich, UK

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  1. Agricultural and Food Research Council Photosynthesis Group, John Innes Institute, Colney Lane, NR4 7UH, Norwich, UK

    N. J. Walton & H. W. Woolhouse

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  1. N. J. Walton
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  2. H. W. Woolhouse
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Walton, N.J., Woolhouse, H.W. Enzymes of serine and glycine metabolism in leaves and non-photosynthetic tissues of Pisum sativum L.. Planta 167, 119–128 (1986). https://doi.org/10.1007/BF00446378

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  • DOI: https://doi.org/10.1007/BF00446378

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