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  PLGG1, a plastidic glycolate glycerate transporter, is required for photorespiration and defines a unique class of metabolite transporters

Pick, T. R., Brautigam, A., Schulz, M. A., Obata, T., Fernie, A. R., & Weber, A. P. (2013). PLGG1, a plastidic glycolate glycerate transporter, is required for photorespiration and defines a unique class of metabolite transporters. Proceedings of the National Academy of Sciences of the United States of America, 110, 3185-3190.

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Pick, T. R.1, Autor
Brautigam, A.1, Autor
Schulz, M. A.1, Autor
Obata, T.2, Autor           
Fernie, A. R.2, Autor           
Weber, A. P.1, Autor
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1External Organizations, ou_persistent22              
2Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753339              

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 Zusammenfassung: Photorespiratory carbon flux reaches up to a third of photosynthetic flux, thus contributes massively to the global carbon cycle. The pathway recycles glycolate-2-phosphate, the most abundant byproduct of RubisCO reactions. This oxygenation reaction of RubisCO and subsequent photorespiration significantly limit the biomass gains of many crop plants. Although photorespiration is a compartmentalized process with enzymatic reactions in the chloroplast, the peroxisomes, the mitochondria, and the cytosol, no transporter required for the core photorespiratory cycle has been identified at the molecular level to date. Using transcript coexpression analyses, we identified Plastidal glycolate glycerate translocator 1 (PLGG1) as a candidate core photorespiratory transporter. Related genes are encoded in the genomes of archaea, bacteria, fungi, and all Archaeplastida and have previously been associated with a function in programmed cell-death. A mutant deficient in PLGG1 shows WT-like growth only in an elevated carbon dioxide atmosphere. The mutant accumulates glycolate and glycerate, leading to the hypothesis that PLGG1 is a glycolate/glycerate transporter. This hypothesis was tested and supported by in vivo and in vitro transport assays and (18)O(2)-metabolic flux profiling. Our results indicate that PLGG1 is the chloroplastidic glycolate/glycerate transporter, which is required for the function of the photorespiratory cycle. Identification of the PLGG1 transport function will facilitate unraveling the role of similar proteins in bacteria, archaea, and fungi in the future.

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Sprache(n): eng - English
 Datum: 2013
 Publikationsstatus: Erschienen
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Titel: Proceedings of the National Academy of Sciences of the United States of America
  Andere : Proc. Natl. Acad. Sci. U. S. A.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: National Academy of Sciences
Seiten: - Band / Heft: 110 Artikelnummer: - Start- / Endseite: 3185 - 3190 Identifikator: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230