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  • Park, Y I, et al. (författare)
  • Role of a novel photosystem II-associated carbonic anhydrase in photosynthetic carbon assimilation in Chlamydomonas reinhardtii
  • 1999
  • Ingår i: FEBS Letters. - 0014-5793. ; 444:1, s. 102-105
  • Tidskriftsartikel (refereegranskat)abstract
    • Intracellular carbonic anhydrases (CA) in aquatic photosynthetic organisms are involved in the CO2-concentrating mechanism (CCM), which helps to overcome CO2 limitation in the environment. In the green alga Chlamydomonas reinhardtii, this CCM is initiated and maintained by the pH gradient created across the chloroplast thylakoid membranes by photosystem (PS) II-mediated electron transport. We show here that photosynthesis is stimulated by a novel, intracellular alpha-CA bound to the chloroplast thylakoids. It is associated with PSII on the lumenal side of the thylakoid membranes. We demonstrate that PSII in association with this lumenal CA operates to provide an ample flux of CO2 for carboxylation. (C) 1999 Federation of European Biochemical Societies.
  • Rojdestvenski, I, et al. (författare)
  • A carbonic anhydrase catalyzed CO2 pump in Chlamydomonas reinhardtii : In vivo experiments, computer modelling, and theory
  • 2000
  • Ingår i: Russian journal of plant physiology. - 1021-4437. ; 47:5, s. 613-621
  • Tidskriftsartikel (refereegranskat)abstract
    • We studied the bicarbonate depletion effects on photosynthesis in high-CO2 grown-cell wall-less mutants of Chlamydomonas reinhardtii with (cw92) and without (cia3/cw15) active carbonic anhydrase (CA) associated with photosystem II (PSII). The mutants were grown in a high-CO2 medium and then washed with a CO2-free buffer. We discuss the shutdown of oxygen evolution in cw92 as a consequence of CO2 depletion of the Calvin cycle. It is suggested that CA acts as part of a PSII-driven pump delivering CO2 from the lumen into the stroma, where it becomes available to the Calvin cycle. Our model is supported by computer simulation data and accommodates the results of in vivo experiments as well as the differences between cw92 and cia3 mutants. We also present a simple theory of the phenomena discussed, based on a time-scale hierarchy approach, which describes the CO2 depletion in cw92 using only two rate constants-V-max and K-m of the Calvin cycle.
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Karlsson, Jan, 1966- ... (2)
Park, Y I (2)
Klimov, V (1)
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Umeå universitet (2)
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