Abstract
Thermostability of the photosynthetic apparatus from purple sulfur bacterium Thermochromatium tepidum was investigated under various conditions and was compared with that from Allochromatium vinosum. It was found that the thermostability of reaction centers (RCs) is very sensitive to its environment, and to the presence of surrounding core light-harvesting complex (LH1). The results imply that the RC of T. tepidum gains thermostability through interactions between its polypeptides and LH1 complex. The thermostability of RC was also affected by its constituting subunits: that is, the RC containing a cytochrome subunit was more thermostable than the cytochrome-detached RC. This suggests that the cytochrome subunit may play an important role for protecting the special pair pigments from denaturation. Furthermore, we have found that the LH2 complexes from T. tepidum and A. vinosum showed very high thermostability among photosynthetic membrane pigment-protein complexes.
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Kobayashi, M., Shimada, Y., Fujioka, Y., Suzuki, H., Wang, ZY., Nozawa, T. (2008). Structure For Thermostability Of Photosynthetic Reaction Center From Thermophilic Purple Sulfur Bacterium, Thermochromatium tepidum . In: Allen, J.F., Gantt, E., Golbeck, J.H., Osmond, B. (eds) Photosynthesis. Energy from the Sun. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6709-9_27
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DOI: https://doi.org/10.1007/978-1-4020-6709-9_27
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