Abstract
Changes in composition of membrane proteins in Synechocystis PCC 6803 induced by the shift of light regime for photosynthetic growth were studied in relation to the regulation of PS I/PS II stoichiometry. Special attention was paid to the changes in abundance of proteins of PS I and PS II complexes. Composition was examined using a LDS-PAGE and a quantitative enzyme immunoassay. Abundance of PsaA/B polypeptides and the PsaC polypeptide of the PS I complex, on a per cell basis, increased under the light regime exciting preferentially PS II and decreased under the light regime exciting mainly PS I. Similar changes were observed with polypeptides of 18.5, 10 and 8.5 kDa. The abundance of other proteins associated with membranes, including PsbA polypeptide of the PS II complex, was fairly constant irrespective of light regime. These results are consistent with our previous observations with other strains of cyanophytes (Anabaena variabilis M2 and Synechocystis PCC 6714) that PS I is the variable component in changes in PS I/PS II stoichiometry in response to changing light regimes for photosynthesis.
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Abbreviations
- CBB:
-
Coomassie brilliant blue
- Chl:
-
chlorophyll
- EIA:
-
enzyme immunoassay
- LDS:
-
lithium dodecyl sulfate
- PAGE:
-
polyacrylamide gel electrophoresis
- PS:
-
photosystem
- PVDF:
-
polyvinylidene difluoride
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Aizawa, K., Shimizu, T., Hiyama, T. et al. Changes in composition of membrane proteins accompanying the regulation of PS I/PS II stoichiometry observed with Synechocystis PCC 6803. Photosynth Res 32, 131–138 (1992). https://doi.org/10.1007/BF00035947
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DOI: https://doi.org/10.1007/BF00035947