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1.
Cell Calcium ; 58(1): 98-104, 2015 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-25465893

RESUMEN

Plant photorespiration is an essential prerequisite for oxygenic photosynthesis. This metabolic repair pathway bestrides four compartments, which poses the requirement for several metabolites transporters for pathway function. However, in contrast to the well-studied enzymatic steps of the core photorespiratory cycle, only few photorespiratory translocators have been identified to date. In this review, we give an overview of established and unknown plastidic transport proteins involved in photorespiration and intertwined nitrogen and sulfur metabolism, respectively. Furthermore, we discuss the evolutionary origin of the dicarboxylate translocators and the recently identified glycolate glycerate translocator.


Asunto(s)
Carbono/metabolismo , Cloroplastos/metabolismo , Proteínas de Transporte de Membrana/metabolismo , Nitrógeno/metabolismo , Azufre/metabolismo , Arabidopsis/metabolismo , Proteínas de Arabidopsis/metabolismo , Transportadores de Ácidos Dicarboxílicos/metabolismo , Fotosíntesis
2.
PLoS One ; 7(8): e42809, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-22912743

RESUMEN

BACKGROUND: Photorespiratory carbon metabolism was long considered as an essentially closed and nonregulated pathway with little interaction to other metabolic routes except nitrogen metabolism and respiration. Most mutants of this pathway cannot survive in ambient air and require CO(2)-enriched air for normal growth. Several studies indicate that this CO(2) requirement is very different for individual mutants, suggesting a higher plasticity and more interaction of photorespiratory metabolism as generally thought. To understand this better, we examined a variety of high- and low-level parameters at 1% CO(2) and their alteration during acclimation of wild-type plants and selected photorespiratory mutants to ambient air. METHODOLOGY AND PRINCIPAL FINDINGS: The wild type and four photorespiratory mutants of Arabidopsis thaliana (Arabidopsis) were grown to a defined stadium at 1% CO(2) and then transferred to normal air (0.038% CO(2)). All other conditions remained unchanged. This approach allowed unbiased side-by-side monitoring of acclimation processes on several levels. For all lines, diel (24 h) leaf growth, photosynthetic gas exchange, and PSII fluorescence were monitored. Metabolite profiling was performed for the wild type and two mutants. During acclimation, considerable variation between the individual genotypes was detected in many of the examined parameters, which correlated with the position of the impaired reaction in the photorespiratory pathway. CONCLUSIONS: Photorespiratory carbon metabolism does not operate as a fully closed pathway. Acclimation from high to low CO(2) was typically steady and consistent for a number of features over several days, but we also found unexpected short-term events, such as an intermittent very massive rise of glycine levels after transition of one particular mutant to ambient air. We conclude that photorespiration is possibly exposed to redox regulation beyond known substrate-level effects. Additionally, our data support the view that 2-phosphoglycolate could be a key regulator of photosynthetic-photorespiratory metabolism as a whole.


Asunto(s)
Adaptación Fisiológica/efectos de los fármacos , Adaptación Fisiológica/efectos de la radiación , Arabidopsis/efectos de los fármacos , Arabidopsis/metabolismo , Dióxido de Carbono/farmacología , Luz , Arabidopsis/citología , Arabidopsis/efectos de la radiación , Proteínas de Arabidopsis/química , Proteínas de Arabidopsis/genética , Proteínas de Arabidopsis/metabolismo , Respiración de la Célula/efectos de los fármacos , Respiración de la Célula/efectos de la radiación , Ciclo del Ácido Cítrico/efectos de los fármacos , Ciclo del Ácido Cítrico/efectos de la radiación , Relación Dosis-Respuesta a Droga , Técnicas de Inactivación de Genes , Mutación/efectos de los fármacos , Mutación/efectos de la radiación , Monoéster Fosfórico Hidrolasas/deficiencia , Monoéster Fosfórico Hidrolasas/genética , Procesos Fotoquímicos/efectos de los fármacos , Procesos Fotoquímicos/efectos de la radiación , Complejo de Proteína del Fotosistema II/metabolismo , Hojas de la Planta/citología , Hojas de la Planta/efectos de los fármacos , Hojas de la Planta/metabolismo , Hojas de la Planta/efectos de la radiación
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