Abstract
Inorganic carbon (Ci) uptake was measured in wild-type cells of Chlamydomonas reinhardtii, and in cia-3, a mutant strain of C. reinhardtii that cannot grow with air levels of CO2. Both air-grown cells, that have a CO2 concentrating system, and 5% CO2-grown cells that do not have this system, were used. When the external pH was 5.1 or 7.3, air-grown, wild-type cells accumulated inorganic carbon (Ci) and this accumulation was enhanced when the permeant carbonic anhydrase inhibitor, ethoxyzolamide, was added. When the external pH was 5.1, 5% CO2-grown cells also accumulated some Ci, although not as much as air-grown cells and this accumulation was stimulated by the addition of ethoxyzolamide. At the same time, ethoxyzolamide inhibited CO2 fixation by high CO2-grown, wild-type cells at both pH 5.1 and 7.3. These observations imply that 5% CO2-grown, wild-type cells, have a physiologically important internal carbonic anhydrase, although the major carbonic anhydrase located in the periplasmic space is only present in air-grown cells. Inorganic carbon uptake by cia-3 cells supported this conclusion. This mutant strain, which is thought to lack an internal carbonic anhydrase, was unaffected by ethoxyzolamide at pH 5.1. Other physiological characteristics of cia-3 resemble those of wild-type cells that have been treated with ethoxyzolamide. It is concluded that an internal carbonic anhydrase is under different regulatory control than the periplasmic carbonic anhydrase.
Full text
PDF




Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Baba S., Mishima H., Miyachi Y. Levels of cyclic-AMP, cyclic-GMP and betamethasone in the aqueous humor following topical administration of betamethasone in rabbit eyes. Hiroshima J Med Sci. 1983 Sep;32(3):301–304. [PubMed] [Google Scholar]
- Badger M. R., Kaplan A., Berry J. A. Internal Inorganic Carbon Pool of Chlamydomonas reinhardtii: EVIDENCE FOR A CARBON DIOXIDE-CONCENTRATING MECHANISM. Plant Physiol. 1980 Sep;66(3):407–413. doi: 10.1104/pp.66.3.407. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Coleman J. R., Berry J. A., Togasaki R. K., Grossman A. R. Identification of Extracellular Carbonic Anhydrase of Chlamydomonas reinhardtii. Plant Physiol. 1984 Oct;76(2):472–477. doi: 10.1104/pp.76.2.472. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Gehl K. A., Colman B. Effect of External pH on the Internal pH of Chlorella saccharophila. Plant Physiol. 1985 Apr;77(4):917–921. doi: 10.1104/pp.77.4.917. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Moroney J. V., Husic H. D., Tolbert N. E. Effect of Carbonic Anhydrase Inhibitors on Inorganic Carbon Accumulation by Chlamydomonas reinhardtii. Plant Physiol. 1985 Sep;79(1):177–183. doi: 10.1104/pp.79.1.177. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Moroney J. V., Kitayama M., Togasaki R. K., Tolbert N. E. Evidence for Inorganic Carbon Transport by Intact Chloroplasts of Chlamydomonas reinhardtii. Plant Physiol. 1987 Mar;83(3):460–463. doi: 10.1104/pp.83.3.460. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Moroney J. V., Tolbert N. E. Inorganic Carbon Uptake by Chlamydomonas reinhardtii. Plant Physiol. 1985 Feb;77(2):253–258. doi: 10.1104/pp.77.2.253. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Moroney J. V., Wilson B. J., Tolbert N. E. Glycolate Metabolism and Excretion by Chlamydomonas reinhardtii. Plant Physiol. 1986 Nov;82(3):821–826. doi: 10.1104/pp.82.3.821. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Nelson E. B., Tolbert N. E. The regulation of glycolate metabolism in Chlamydomonas reinhardtii. Biochim Biophys Acta. 1969 Jul 30;184(2):263–270. doi: 10.1016/0304-4165(69)90028-2. [DOI] [PubMed] [Google Scholar]
- Spalding M. H., Spreitzer R. J., Ogren W. L. Carbonic Anhydrase-Deficient Mutant of Chlamydomonas reinhardii Requires Elevated Carbon Dioxide Concentration for Photoautotrophic Growth. Plant Physiol. 1983 Oct;73(2):268–272. doi: 10.1104/pp.73.2.268. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sueoka N. MITOTIC REPLICATION OF DEOXYRIBONUCLEIC ACID IN CHLAMYDOMONAS REINHARDI. Proc Natl Acad Sci U S A. 1960 Jan;46(1):83–91. doi: 10.1073/pnas.46.1.83. [DOI] [PMC free article] [PubMed] [Google Scholar]