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Fixation of carbon dioxide coupled to photochemical reduction of pyridine nucleotides by chloroplast preparations


, : Fixation of carbon dioxide coupled to photochemical reduction of pyridine nucleotides by chloroplast preparations. Journal of Biological Chemistry 195(1): 75-93

Green grana obtained from spinach leaves can reduce di-and triphosphopyridine nucleotide in the light. Through the photochemical reduction of triphosphopyridine nucleotide the grana can mediate the reductive carboxylation of pyruvate to malate in the presence of "malic" enzyme, and the reductive carboxylation of alpha-ketoglutarate to citrate in the presence of isocitric dehydrogenase and aconitase. Through the photochemical reduction of diphosphopyridine nucleotide the grana can mediate the reduction of pyruvate to lactate, that of oxalacetate to malate, and the reductive amination of alpha-ketoglutarate in the presence of lactic, malic, and glutamic dehydrogenase respectively. The diphosphopyridine nucleotide-linked reduction of 1,3-diphosphoglycerate can also be carried out by illuminated grana to yield hexose diphosphate in the presence of the appropriate enzymes. When the grana are supplemented with an extract of Escherichia coli, fumarate is reduced to succinate in the light. If further supplemented with triphosphopyridine nucleotide, "malic" enzyme, and fumarase, a photochemical formation of succinate from pyruvate and CO2 is obtained. The photochemical reduction of diphosphopyridine nucleotide is accompanied by the evolution of 0.5 mole of O2 per mole of nucleotide reduced. The significance of the above findings is discussed.

US$29.90

PMID: 14938356


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