1993
DOI: 10.1007/bf00196619
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The plastidic 3-phosphoglycerate ? acetyl-CoA pathway in barley leaves and its involvement in the synthesis of amino acids, plastidic isoprenoids and fatty acids during chloroplast development

Abstract: Abstract.Earlier studies on the synthesis of C3-derived amino acids, plastidic isoprenoids and fatty acids from CO 2 by isolated chloroplasts in the light indicate the presence of a complete, but low-capacity, chloroplast (chip) 3-phosphoglycerate ~ acetyl-CoA pathway which is predominantely active in immature (developing) chloroplasts (A. Heintze et al., 1990, Plant Physiol. 93, 1121 1127. In this paper, we demonstrate the activity of the enzymes involved i.e. chip phosphoglycerate mutase, chip enolase, chlp… Show more

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Cited by 27 publications
(18 citation statements)
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“…In the literature there are some uncertainties whether or not the chloroplast in a11 species is fully selfprovidmg with respect to acetyl-COA by its PDC isoform or if acetyl-COA is supplied from other compartments of the cell (Givan, 1983). The substrate pyruvate for cpPDC could be provided by a stromal glycolytic pathway starting with 3-phosphoglycerate (Murphy and Leech, 1978;Hoppe et al, 1993). Altematively, malate could be imported from the cytosol and converted into pyruvate by a stromal NADPmalic enzyme (Smith et al, 1992), or pyruvate could be imported directly to the stroma (Smith et al, 1992).…”
Section: Discussionmentioning
confidence: 99%
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“…In the literature there are some uncertainties whether or not the chloroplast in a11 species is fully selfprovidmg with respect to acetyl-COA by its PDC isoform or if acetyl-COA is supplied from other compartments of the cell (Givan, 1983). The substrate pyruvate for cpPDC could be provided by a stromal glycolytic pathway starting with 3-phosphoglycerate (Murphy and Leech, 1978;Hoppe et al, 1993). Altematively, malate could be imported from the cytosol and converted into pyruvate by a stromal NADPmalic enzyme (Smith et al, 1992), or pyruvate could be imported directly to the stroma (Smith et al, 1992).…”
Section: Discussionmentioning
confidence: 99%
“…cpPDC is also regulated by product inhibition but is not phosphorylated (Elias and Givan, 1979; Camp and Randall, 1985; Liedvogel and Bauerle, 1986). The PDC isoforms have similar substrate dependencies but differ in pH and magnesium optima (Williams and Randall, 1979; Treede and Heise, 1986; Hoppe et al, 1993). The requirement of cpPDC for higher pH and Mg2+ concentrations is in accord with an indirect regulation by light/dark transitions.…”
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confidence: 89%
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