The Genetic Dissection of a Short-Term Response to Low CO_(2) Supports the Possibility for Peroxide-Mediated Decarboxylation of Photorespiratory Intermediates in the Peroxisome

作     者：Olivier Keech Wenxu Zhou Ricarda Fenske Catherine Colas-des-Francs-Small John D.Bussell Murray R.Badger Steven M.Smith 

作者机构：Centres of Excellence for Plant Metabolomics and Plant Energy BiologyUniversity of Western Australia35 Stirling HighwayCrawleyWestern Australia 6009Australia UPSCDepartment of Plant PhysiologyUmea University90187UmeaSweden Metabolomics AustraliaUniversity of Western Australia35 Stirling HighwayCrawleyWestern Australia 6009Australia Centre of Excellence in Plant Energy BiologyResearch School of BiologyAustralian National UniversitySullivans Creek RoadActon ACT 0200Australia 

出 版 物：《Molecular Plant》 (分子植物（英文版）)

年 卷 期：2012年第5卷第6期

页      面：1413-1416页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 09[农学] 0903[农学-农业资源与环境] 071002[理学-动物学] 

基　　金：supported by Australian Research Council awards Government of Western Australia Centres of Excellence scheme Swedish Foundation for International Cooperation in Research and Higher Education (STINT) 

主　　题：HYDROXYPYRUVATE REDUCTASE OXIDATIVE STRESS IRON-DEFICIENCY ABSENCE CAUSES ARABIDOPSIS CATALASE PLANTS PHOTOSYNTHESIS STOICHIOMETRY METABOLISM 

摘      要：Dear Editor, Photorespiration reduces plant carbon assimilation by an estimated 25%-50% of net CO2 assimilation in typical C3 plants （Roussel and Igamberdiev, 2011）. It results from the oxygenase activity of Rubisco giving rise to phosphogly- colate. Subsequent photorespiratory metabolism involves decarboxylation of glycine in the mitochondrion and reduc- tion of hydroxypyruvate, usually assumed to occur in the peroxisome. Recent research in Arabidopsis has highlighted possible alternative sites of hydroxypyruvate reductase （HPR） activity （Figure 1A）. In addition to the accepted reduction by peroxisomal HPR1, Timm et al. （2008） identified cytosolic HPR2 and a putative chloroplast HPR3 （Timm et al., 2011）. For HPR2 or HPR3 to function in photorespiration, hydroxypyru- vate would first need to pass from the peroxisome into the cytosol. Another potential fate for hydroxypyruvate is its non-enzymic （NE） decarboxylation by reaction with hydrogen peroxide as previously suggested by experiments performed on isolated peroxisomes （Walton and Butt, 1981）.