Biochemistry

Abstract

CS-21-1 - Metabolite transport between cellular organelles in photorespiration and C4 photosynthesis

Tuesday, July 17
8:33 AM - 8:53 AM

Plastids are metabolically extraordinarily active and versatile organelles that are found in all plant and algae cells. Plastidial metabolism is tightly interfaced with that of the surrounding cytoplasm via solute transporters that reside in the inner of two layers of envelope membrane that circumference the plastid. Particular tight metabolic connections exist between chloroplasts, peroxisomes, and mitochondria during photosynthesis since these organelles cooperate in photorespiration, the metabolic repair process that detoxifies 2-phosphoglycolic acid (2-PG). The photorespiratory pathway not only detoxifies the oxygenation product of the Rubisco reaction, it also recovers part of the carbon contained in 2-PG and it transfers redox power from the chloroplasts to the mitochondria. Further, photorespiration provides a stepping stone for the evolution of the highly efficient biochemical carbon concentrating mechanism of C4photosynthesis.


We will here report on our recent findings on the role of organellar solute transporters in facilitating metabolic flux in photorespiration and C4photosynthesis, with particular emphasis on the role of inter-organellar and inter-cellular transport processes in the evolution of C4photosynthesis. 


 

Andreas P.M. Weber

Heinrich Heine University

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CS-21-1 - Metabolite transport between cellular organelles in photorespiration and C4 photosynthesis



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