Difference between revisions of "Giordano 2003 Plant Physiol"
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{{Publication | {{Publication | ||
|title=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- | |title=Giordano M, Norici A, Forssen M, Eriksson M, Raven JA (2003) An anaplerotic role for mitochondrial carbonic anhydrase in ''Chlamydomonas reinhardtii''. Plant Physiol 132:2126-34. | ||
|info=[https://pubmed.ncbi.nlm.nih.gov/12913167/ PMID:12913167] | |info=[https://pubmed.ncbi.nlm.nih.gov/12913167/ PMID:12913167] | ||
|authors=Giordano Mario, Norici Alessandra, Forssen Magnus, Eriksson Mats, Raven John A | |authors=Giordano Mario, Norici Alessandra, Forssen Magnus, Eriksson Mats, Raven John A | ||
|year=2003 | |year=2003 | ||
|journal=Plant Physiol | |journal=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 | |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<sub>2</sub> 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<sub>4</sub><sup>+</sup> concentration decreases, to the point of being undetectable when NH<sub>4</sub><sup>+</sup> supply restricts the rate of photoautotrophic growth. The expression of mtCA can also be induced at supra-atmospheric partial pressure of CO<sub>2</sub> by increasing the NH<sub>4</sub><sup>+</sup> 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<sub>3</sub><sup>-</sup> for anaplerotic assimilation catalyzed by phosphoenolpyruvate carboxylase, which provides C skeletons for N assimilation under some circumstances. | ||
}} | }} | ||
{{Labeling | {{Labeling | ||
|additional=Algae, | |additional=Algae, Photosynthesis | ||
}} | }} | ||
Revision as of 10:21, 11 September 2021
| Giordano M, Norici A, Forssen M, Eriksson M, Raven JA (2003) An anaplerotic role for mitochondrial carbonic anhydrase in Chlamydomonas reinhardtii. Plant Physiol 132:2126-34. |
Giordano Mario, Norici Alessandra, Forssen Magnus, Eriksson Mats, Raven John A (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 CO2 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 NH4+ concentration decreases, to the point of being undetectable when NH4+ supply restricts the rate of photoautotrophic growth. The expression of mtCA can also be induced at supra-atmospheric partial pressure of CO2 by increasing the NH4+ concentration in the growth medium. Conditions that favor mtCA expression usually also stimulate anaplerosis. We therefore propose that the mtCA is involved in supplying HCO3- for anaplerotic assimilation catalyzed by phosphoenolpyruvate carboxylase, which provides C skeletons for N assimilation under some circumstances.
Labels:
Algae, Photosynthesis
