Abstract
Unicellular algae grown under low-CO2 conditions (0.03% CO2) have developed a means of concentrating CO2 at the site of ribulose-1,5-bisphosphate carboxylase/oxygenase. Cells with the CO2-concentrating mechanism (CCM) acquire the ability to accumulate inorganic carbon to a level higher than that obtained by simple diffusion. To identify proteins which are involved in the organization of the CCM, cells of Scenedesumus obliquus and Chlorella vulgaris grown in high CO2 (5% CO2 in air) were transferred to low-CO2 (0.03%) conditions in the presence of 35SO sup2−inf4 and, thereafter, polypeptides labeled with 35S were detected. Under low-CO2 conditions the inducton of 36-, 39-, 94- and 110- to 116kDa polypeptides were particularly observed in S. obliquus and 16-, 19-, 27-, 36-, 38- and 45-kDa polypeptides were induced in C. vulgaris. Western blots with antibodies raised against 37-kDa subunits of the periplasmic carbonic anhydrase (CA) of Chlamydomonas reinhardtii showed immunoreactive bands with the 39-kDa polypeptide in the whole-cell homogenates from S. obliquus and with 36 and 38-kDa polypeptides in both high- and low-CO2grown cells of C. vulgaris. Anti-pea-chloroplast CA antibodies cross-reacted with a single polypeptide of 30 kDa in the whole-cell homogenates but not with thylakoid membranes. The CA activity was associated with soluble and membrane-bound fractions, except thylakoid membranes.
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Abbreviations
- CA:
-
carbonic anhydrase
- CCM:
-
CO2-concentrating mechanism
- DIC:
-
dissolved inorganic carbon (CO2 + HCO sup−inf3 + CO sup2−inf3 )
- Rubisco:
-
ribulose-1,5-bisphosphatecarboxylase/oxygenase
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The authors are grateful to Prof. S. Bartlett (Louisiana State University, USA) for the gift of antibodies against spinach Rubisco and to Prof. J. Coleman (University of Toronto, Canada) for providing pea chloroplast CA antibodies. We thank Dr. J. Moroney (Louisiana State University, USA) for providing antibodies against the 37-kDa subunits of periplasmic CA of C. reinhardtii. We thank Prof. D. Müller (University of Konstanz, Germany) and Dr. Flor Martínez (Universidad Autónoma de Madrid, Spain) for their critical contribution to the manuscript. This work was supported by Instituto Tecnológico de Canarias (Spain).
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Ramazanov, Z., Shiraiwa, Y., del Río, M.J. et al. Effect of external CO2 concentrations on protein synthesis in the green algae Scenedesmus obliquus (Turp.) Kütz and Chlorella vulgaris (Kosikov). Planta 197, 272–277 (1995). https://doi.org/10.1007/BF00202647
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DOI: https://doi.org/10.1007/BF00202647