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Model studies of the regulation of the Calvin photosynthesis cycle by cytosolic metabolites

Pettersson, Gösta LU and Ryde-Pettersson, Ulf LU (1990) In Biomedica Biochimica Acta 49(8-9). p.723-732
Abstract

A kinetic model for photosynthetic carbohydrate formation in the chloroplast of C3 plants is presented which includes consideration of the interaction of the phosphate translocator of the chloroplast envelope with external reactants such as 3-phosphoglycerate, dihydroxyacetone phosphate, and glyceraldehyde 3-phosphate in addition to inorganic (ortho)phosphate. The model is shown to account satisfactorily for experimentally observed effects of such reactants on the rates of carbon dioxide fixation and starch production in isolated chloroplast. The predictions of the model with regard to the regulation of stromal processes of photosynthetic carbohydrate formation by cytosolic concentration variables have been examined. The... (More)

A kinetic model for photosynthetic carbohydrate formation in the chloroplast of C3 plants is presented which includes consideration of the interaction of the phosphate translocator of the chloroplast envelope with external reactants such as 3-phosphoglycerate, dihydroxyacetone phosphate, and glyceraldehyde 3-phosphate in addition to inorganic (ortho)phosphate. The model is shown to account satisfactorily for experimentally observed effects of such reactants on the rates of carbon dioxide fixation and starch production in isolated chloroplast. The predictions of the model with regard to the regulation of stromal processes of photosynthetic carbohydrate formation by cytosolic concentration variables have been examined. The results indicate that the cytosolic concentrations of metabolites that interact with the phosphate translocator represent important regulatory signals. Increasing levels of exported photosynthetic (phosphoglycerates and triose phosphates) in the cytosol do not suppress the rate of photosynthetic carbon dioxide fixation, but redirects reaction flux such that starch production within the chloroplast is favoured at the expense of a decreased rate of photosynthate export to the cytosol.

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organization
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type
Contribution to journal
publication status
published
subject
in
Biomedica Biochimica Acta
volume
49
issue
8-9
pages
10 pages
publisher
Akademie Verlag
external identifiers
  • scopus:0025607182
ISSN
0232-766X
language
English
LU publication?
yes
id
83cde1bc-1b6b-433d-ba51-ff658e6d1fcc
date added to LUP
2017-02-04 11:20:15
date last changed
2017-03-06 16:19:19
@article{83cde1bc-1b6b-433d-ba51-ff658e6d1fcc,
  abstract     = {<p>A kinetic model for photosynthetic carbohydrate formation in the chloroplast of C<sub>3</sub> plants is presented which includes consideration of the interaction of the phosphate translocator of the chloroplast envelope with external reactants such as 3-phosphoglycerate, dihydroxyacetone phosphate, and glyceraldehyde 3-phosphate in addition to inorganic (ortho)phosphate. The model is shown to account satisfactorily for experimentally observed effects of such reactants on the rates of carbon dioxide fixation and starch production in isolated chloroplast. The predictions of the model with regard to the regulation of stromal processes of photosynthetic carbohydrate formation by cytosolic concentration variables have been examined. The results indicate that the cytosolic concentrations of metabolites that interact with the phosphate translocator represent important regulatory signals. Increasing levels of exported photosynthetic (phosphoglycerates and triose phosphates) in the cytosol do not suppress the rate of photosynthetic carbon dioxide fixation, but redirects reaction flux such that starch production within the chloroplast is favoured at the expense of a decreased rate of photosynthate export to the cytosol.</p>},
  author       = {Pettersson, Gösta and Ryde-Pettersson, Ulf},
  issn         = {0232-766X},
  language     = {eng},
  number       = {8-9},
  pages        = {723--732},
  publisher    = {Akademie Verlag},
  series       = {Biomedica Biochimica Acta},
  title        = {Model studies of the regulation of the Calvin photosynthesis cycle by cytosolic metabolites},
  volume       = {49},
  year         = {1990},
}