title: The regulatory interplay between photorespiration and photosynthesis.
abstract: The Calvin-Benson cycle and the photorespiratory pathway form the photosynthetic-photorespiratory supercycle that is responsible for nearly all biological CO2 fixation on Earth. In essence, supplementation with the photorespiratory pathway is necessary because the CO2-fixing enzyme of the Calvin-Benson cycle, ribulose 1,5-bisphosphate carboxylase (Rubisco), catalyses several side reactions including the oxygenation of ribulose 1,5-bisphosphate, which produces the noxious metabolite phosphoglycolate. The photorespiratory pathway recycles the phosphoglycolate to 3-phosphoglycerate and in this way allows the Calvin-Benson cycle to operate in the presence of molecular oxygen generated by oxygenic photosynthesis. While the carbon flow through the individual and combined subprocesses is well known, information on their regulatory interaction is very limited. Regulatory feedback from the photorespiratory pathway to the Calvin-Benson cycle can be presumed from numerous inhibitor experiments and was demonstrated in recent studies with transgenic plants. This complexity illustrates that we are not yet ready to rationally engineer photosynthesis by altering photorespiration since despite massive understanding of the core photorespiratory pathway our understanding of its interaction with other pathways and processes remains fragmentary.
authors.affiliation: University of Rostock, Plant Physiology Department, Albert-Einstein-Straße 3, D-18051 Rostock, Germany.
authors.forename: Stefan
authors.identifier: 0000-0003-3105-6296
authors.initials: S
authors.lastname: Timm
authors.affiliation: Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Florian
authors.affiliation: Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany.
authors.forename: Alisdair R
authors.initials: AR
authors.lastname: Fernie
authors.affiliation: University of Rostock, Plant Physiology Department, Albert-Einstein-Straße 3, D-18051 Rostock, Germany hermann.bauwe@uni-rostock.de.
authors.forename: Hermann
authors.identifier: 0000-0001-7802-8925
authors.initials: H
authors.lastname: Bauwe
mesh_terms: D002245:Carbon Dioxide / Q000378:metabolism; D025461:Feedback, Physiological; D010785:Photophosphorylation / Q000502:physiology; D010788:Photosynthesis / Q000502:physiology*; D018521:Plant Physiological Phenomena; D010944:Plants / Q000378:metabolism; D012273:Ribulose-Bisphosphate Carboxylase / Q000378:metabolism
chemical_list: D002245:Carbon Dioxide; D012273:Ribulose-Bisphosphate Carboxylase
keywords: Calvin–Benson cycle; gas exchange; glycine decarboxylase; metabolic regulation; mutant; photorespiration; photosynthesis.