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Chapter 14 C4 Decarboxylases: Different Solutions for the Same Biochemical Problem, the Provision of CO2 to Rubisco in the Bundle Sheath Cells

Drincovich, María F. ; Lara, María V. ; Andreo, Carlos S. ; Maurino, Veronica G.

C4 Photosynthesis and Related CO2 Concentrating Mechanisms, p.277-300

Dordrecht: Springer Netherlands

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  • Título:
    Chapter 14 C4 Decarboxylases: Different Solutions for the Same Biochemical Problem, the Provision of CO2 to Rubisco in the Bundle Sheath Cells
  • Autor: Drincovich, María F. ; Lara, María V. ; Andreo, Carlos S. ; Maurino, Veronica G.
  • Assuntos: Crassulacean Acid Metabolism ; Crassulacean Acid Metabolism Photosynthesis ; Crassulacean Acid Metabolism Plant ; Flaveria Species ; PEPCK Activity
  • É parte de: C4 Photosynthesis and Related CO2 Concentrating Mechanisms, p.277-300
  • Descrição: The decarboxylation of C4 acids in the bundle sheath cells (BSCs) is a key step in the C4 photosynthetic carbon assimilation pathway. Depending on the particular subtype of C4-species, this process can be mediated by different enzymes: NADP-malic enzyme (NADP-ME), NAD-malic enzyme (NAD-ME) and/or phosphoenolpyruvate carboxykinase (PEPCK), and each enzyme has a different subcellular compartmentalization within the BSCs. Thus, the C4 subtype cycle mediated by each decarboxylase displays distinguishing features in leaf anatomy, biochemistry and physiology. In some cases, the operation of more than one type of decarboxylating enzyme in the C4 photosynthetic process has been described. During the last few years, remarkable advances have been made in the characterization of different isoforms of each C4 decarboxylase. In most cases, non-photosynthetic isoforms of the C4-decarboxylating enzymes involved in primary and/or secondary metabolisms were characterized. These non-C4 isoforms were for sure the starting point for the evolution of the C4-specific decarboxylases through the gaining of characteristics that make them more suitable to fulfill the requirements of the photosynthetic process. For each decarboxylating enzyme, the analysis of phylogenetic relationships reveals several features of the molecular evolution of the C4 process which accomplished the same biochemical aim: the generation of CO2 in the vecinity of Rubisco in BSCs, reducing photorespiration and enhancing photosynthesis.
  • Títulos relacionados: Advances in Photosynthesis and Respiration
  • Editor: Dordrecht: Springer Netherlands
  • Idioma: Inglês
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