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• W2020041839 endingPage "16287" @default.
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• W2020041839 abstract "In Chlamydomonas, as in higher plants, synthesis of ADP glucose catalyzed by ADP-glucose pyrophosphorylase is rate-limiting for the building of starch in the chloroplast. We have isolated disruptions of the STA1 ADP-glucose pyrophosphorylase structural gene that rendered the enzyme less responsive to the allosteric activator 3-phosphoglycerate. The structure and composition of the residual starch synthesized by all mutants of the STA1 locus is dramatically altered. The residual polysaccharide is shown to be devoid of amylose despite the presence of granule-bound starch synthase, the amylose biosynthetic enzyme. In addition, the fine structure of the mutant amylopectin revealed the presence of an altered chain-length distribution. This distribution mimicks that which is observed during growth and photosynthesis and differs markedly from that observed during storage. We therefore propose that low nucleotide sugar concentrations are either directly or indirectly responsible for the major differences observed in the composition or structure of starch during storage and photosynthesis. In Chlamydomonas, as in higher plants, synthesis of ADP glucose catalyzed by ADP-glucose pyrophosphorylase is rate-limiting for the building of starch in the chloroplast. We have isolated disruptions of the STA1 ADP-glucose pyrophosphorylase structural gene that rendered the enzyme less responsive to the allosteric activator 3-phosphoglycerate. The structure and composition of the residual starch synthesized by all mutants of the STA1 locus is dramatically altered. The residual polysaccharide is shown to be devoid of amylose despite the presence of granule-bound starch synthase, the amylose biosynthetic enzyme. In addition, the fine structure of the mutant amylopectin revealed the presence of an altered chain-length distribution. This distribution mimicks that which is observed during growth and photosynthesis and differs markedly from that observed during storage. We therefore propose that low nucleotide sugar concentrations are either directly or indirectly responsible for the major differences observed in the composition or structure of starch during storage and photosynthesis." @default.
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• W2020041839 date "1996-07-01" @default.
• W2020041839 modified "2023-09-27" @default.
• W2020041839 title "Control of Starch Composition and Structure through Substrate Supply in the Monocellular Alga" @default.
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• W2020041839 doi "https://doi.org/10.1074/jbc.271.27.16281" @default.
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