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Plant Physiology 52:674-676 (1973)
© 1973 American Society of Plant Biologists

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Articles

A Mechanism for the Indirect Transfer of Photosynthetically Reduced Nicotinamide Adenine Dinucleotide Phosphate from Chloroplasts to the Cytoplasm 1

G. J. Kelly2 and Martin Gibbs

a Department of Biology, Brandeis University, Waltham, Massachusetts 02154

A triose phosphate/3-phosphoglycerate shuttle for the indirect transfer of photosynthetically reduced NADP from chloroplasts to the cytoplasm has been demonstrated in vitro. Triose phosphate, formed from 3-phosphoglycerate in the chloroplast, was oxidized back to 3-phosphoglycerate outside the chloroplast by the nonreversible D-glyceraldehyde 3-phosphate dehydrogenase reaction which is specific for NADP. The 3-phosphoglycerate could presumably return to the chloroplast to complete the shuttle. The properties of nonreversible D-glyceraldehyde 3-phosphate dehydrogenase are considered particularly suitable for effective operation of this shuttle system.

2 Present address: Department of Agricultural Chemistry, University of Sydney, N. S. W. 2006, Australia.

1 This investigation was supported by United States Atomic Energy Commission Grant AT (11-1)-3231 and by National Science Foundation Grant GB 29126 X.




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Copyright © 1973 by the American Society of Plant Biologists