Giordano 2003 Plant Physiol
| Giordano M, Norici A, Forssen M, Eriksson M, Raven JA (2003) An anaplerotic role for mitochondrial carbonic anhydrase in Chlamydomonas reinhardtii. Plant Physiol 132:2126-2134. |
Giordano M, Norici A, Forssen M, Eriksson M, Raven JA (2003) Plant Physiol
Abstract: Previous studies of the mitochondrial carbonic anhydrase (mtCA) of Chlamydomonas reinhardtii showed that expression of the two genes encoding this enzyme activity required photosynthetically active radiation and a low CO(2) concentration. These studies suggested that the mtCA was involved in the inorganic carbon-concentrating mechanism. We have now shown that the expression of the mtCA at low CO(2) concentrations decreases when the external NH(4)(+) concentration decreases, to the point of being undetectable when NH(4)(+) supply restricts the rate of photoautotrophic growth. The expression of mtCA can also be induced at supra-atmospheric partial pressure of CO(2) by increasing the NH(4)(+) concentration in the growth medium. Conditions that favor mtCA expression usually also stimulate anaplerosis. We therefore propose that the mtCA is involved in supplying HCO(3)(-) for anaplerotic assimilation catalyzed by phosphoenolpyruvate carboxylase, which provides C skeletons for N assimilation under some circumstances.
• Bioblast editor: Huete-Ortega Maria
Labels:
Algae, Photosynthesis, MitoFit 2021 Photosynthesis
- Huete-Ortega et al (2021) Substrate-uncoupler-inhibitor-titration protocols for photosynthesis in Chlamydomonas reinhardtii. MitoFit Preprints 2021 (in prep).
