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Metabolism of glucose by unicellular blue-green algae

Metabolism of glucose by unicellular blue-green algae 203 87 87 4 4 R. A. Pelroy R. Rippka R. Y. Stanier Department of Bacteriology and Immunology University of California 94720 Berkeley California U.S.A. Laboratory of Chemical Biodynamics University of California 94720 Berkeley California U.S.A. Institut Pasteur F-75 Paris France Summary A facultative photo- and chemoheterotroph, the unicellular bluegreen alga Aphanocapsa 6714, dissimilates glucose with formation of CO 2 as the only major product. A substantial fraction of the glucose consumed is assimilated and stored as polyglucose (probably glycogen). The oxidation of glucose proceeds through the pentose phosphate pathway. The first enzyme of this pathway, glucose-6-phosphate dehydrogenase, is partly inducible. In addition, the rate of glucose oxidation is controlled, at the level of glucose-6-phosphate dehydrogenase function, by the intracellular level of an intermediate of the Calvin cycle, ribulose-1,5-diphosphate, which is a specific allosteric inhibitor of this enzyme. As a consequence, the rate of glucose oxidation is greatly reduced by illumination, an effect reversed by the presence of DCMU, an inhibitor of photosystem II. Two obligate photoautotrophs, Synechococcus 6301 and Aphanocapsa 6308, produce CO 2 from glucose at extremely low rates, although their levels of pentose pathway enzymes and of hexokinase are similar to those in Aphanocapsa 6714. Failure to grow with glucose appears to reflect the absence of an effective glucose permease. A general hypothesis concerning the primary pathways of carbon metabolism in blue-green algae is presented. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Microbiology Springer Journals

Metabolism of glucose by unicellular blue-green algae

Pelroy, R.; Rippka, R.; Stanier, R.
Archives of Microbiology , Volume 87 (4) – Dec 1, 1972
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References (26)

Publisher
Springer Journals
Copyright
Copyright © 1972 by Springer-Verlag
Subject
Life Sciences; Biotechnology; Biochemistry, general; Cell Biology; Ecology; Microbial Ecology; Microbiology
ISSN
0302-8933
eISSN
1432-072X
DOI
10.1007/BF00409131
Publisher site
See Article on Publisher Site

Abstract

203 87 87 4 4 R. A. Pelroy R. Rippka R. Y. Stanier Department of Bacteriology and Immunology University of California 94720 Berkeley California U.S.A. Laboratory of Chemical Biodynamics University of California 94720 Berkeley California U.S.A. Institut Pasteur F-75 Paris France Summary A facultative photo- and chemoheterotroph, the unicellular bluegreen alga Aphanocapsa 6714, dissimilates glucose with formation of CO 2 as the only major product. A substantial fraction of the glucose consumed is assimilated and stored as polyglucose (probably glycogen). The oxidation of glucose proceeds through the pentose phosphate pathway. The first enzyme of this pathway, glucose-6-phosphate dehydrogenase, is partly inducible. In addition, the rate of glucose oxidation is controlled, at the level of glucose-6-phosphate dehydrogenase function, by the intracellular level of an intermediate of the Calvin cycle, ribulose-1,5-diphosphate, which is a specific allosteric inhibitor of this enzyme. As a consequence, the rate of glucose oxidation is greatly reduced by illumination, an effect reversed by the presence of DCMU, an inhibitor of photosystem II. Two obligate photoautotrophs, Synechococcus 6301 and Aphanocapsa 6308, produce CO 2 from glucose at extremely low rates, although their levels of pentose pathway enzymes and of hexokinase are similar to those in Aphanocapsa 6714. Failure to grow with glucose appears to reflect the absence of an effective glucose permease. A general hypothesis concerning the primary pathways of carbon metabolism in blue-green algae is presented.

Journal

Archives of Microbiology – Springer Journals

Published: Dec 1, 1972

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