Journal
FEBS LETTERS
Volume 586, Issue 20, Pages 3692-3697Publisher
WILEY
DOI: 10.1016/j.febslet.2012.08.027
Keywords
Photosynthesis; Photorespiration; Glycine decarboxylase; H-Protein; Arabidopsis
Funding
- Deutsche Forschungsgemeinschaft (Promics Photorespiration Network) [FOR 1186]
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Photorespiration makes oxygenic photosynthesis possible by scavenging 2-phosphoglycolate. Hence, compromising photorespiration impairs photosynthesis. We examined whether facilitating photorespiratory carbon flow in turn accelerates photosynthesis and found that overexpression of the H-protein of glycine decarboxylase indeed considerably enhanced net-photosynthesis and growth of Arabidopsis thaliana. At the molecular level, lower glycine levels confirmed elevated GDC activity in vivo, and lower levels of the CO2 acceptor ribulose 1,5-bisphosphate indicated higher drain from CO2 fixation. Thus, the photorespiratory enzyme glycine decarboxylase appears as an important feed-back signaller that contributes to the control of the Calvin-Benson cycle and hence carbon flow through both photosynthesis and photorespiration. (C) 2012 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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