Acetyl coenzyme A biosynthesis in the chloroplast |
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Authors: | Denis J. Murphy D. A. Walker |
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Affiliation: | (1) Botanisches Institut der Universität, Schloßarten 3, D-4400 Münster, Germany;(2) Robert Hill Laboratory of the A.R.C. Research Group on Photosynthesis, Department of Botany, University of Sheffield, S10 2TN Sheffield, U.K. |
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Abstract: | Acetyl coenzyme A (CoA) biosynthesis in spinach chloroplasts has been investigated by following the incorporation of bicarbonate and acetate into fatty acids under a variety of conditions. Both substrates were readily incorporated into fatty acids in a light-dependent manner by intact photosynthesising chloroplasts, but when the concentrations of these substrates were adjusted to those found in vivo, i.e. 200 M acetate, 10 M bicarbonate, then acetate was found to supply carbon atoms for fatty acids biosynthesis via acetyl CoA at forty times the rate of bicarbonate. It is proposed that extra-chloroplastic free acetate is the pricipal substrate for chloroplasts acetyl CoA biosynthesis in spinach.Abbreviations ACP acyl carrierprotein - CoASH coenzyme A |
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Keywords: | Acetyl CoA (biosynthesis) Chloroplast Coenzyme A, acetyl Cytosol Fatty acid Spinacia (acetyl CoA synthesis) |
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