Elucidating the biosynthesis of 2-carboxyarabinitol 1-phosphate through reduced expression of chloroplastic fructose 1,6-bisphosphate phosphatase and radiotracer studies with 14CO2

Proceedings of the National Academy of Sciences of the United States of America
P John AndralojcM A Parry

Abstract

2-carboxyarabinitol 1-phosphate limits photosynthetic CO2 assimilation at low light because it is a potent, naturally occurring inhibitor of ribulose 1,5-bisphosphate carboxylase/oxygenase. Evidence is presented that this inhibitor is derived from chloroplastic fructose 1,6-bisphosphate. First, transgenic plants containing decreased amounts of chloroplastic fructose 1,6-bisphosphate phosphatase contained increased amounts of fructose 1,6-bisphosphate and 2-carboxyarabinitol 1-phosphate and greatly increased amounts of the putative intermediates hamamelose and 2-carboxyarabinitol, which in some cases were as abundant as sucrose. Second, French bean leaves in the light were shown to incorporate 14C from 14CO2 sequentially into fructose 1,6-bisphosphate, hamamelose bisphosphate, hamamelose monophosphate, hamamelose, and 2-carboxyarabinitol. As shown previously, 14C assimilated by photosynthesis was also incorporated into 2-carboxyarabinitol 1-phosphate during subsequent darkness.

Citations

Aug 1, 2007·Photosynthesis Research·Archie R Portis, Martin A J Parry
Apr 14, 2009·Journal of Experimental Botany·Matthew ReynoldsWilliam J Angus
Nov 20, 2012·Journal of Experimental Botany·Martin A J ParrySpencer M Whitney
Mar 14, 2013·Journal of Integrative Plant Biology·Alvaro Sanz-SáezManuel Sanchez-Diaz
Dec 3, 2011·The Biochemical Journal·Paul John AndralojcMartin A J Parry
Oct 13, 2009·Carbohydrate Research·Won Hee KimHyung Ryong Moon

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