A Transient Exchange of the Photosystem II Reaction Center Protein D1:1 with D1:2 during Low Temperature Stress ofSynechococcus sp. PCC 7942 in the Light Lowers the Redox Potential of QB*. Sane, P. V., Ivanov, A. G., Sveshnikov, D., Huner, N. P. A., & O¨quist, G. Journal of Biological Chemistry, 277(36):32739–32745, September, 2002. ![A Transient Exchange of the Photosystem II Reaction Center Protein D1:1 with D1:2 during Low Temperature Stress ofSynechococcus sp. PCC 7942 in the Light Lowers the Redox Potential of QB* [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Upon exposure to low temperature under constant light conditions, the cyanobacterium Synechococcus sp. PCC 7942 exchanges the photosystem II reaction center D1 protein form 1 (D1:1) with D1 protein form 2 (D1:2). This exchange is only transient, and after acclimation to low temperature the cells revert back to D1:1, which is the preferred form in acclimated cells (Campbell, D., Zhou, G., Gustafsson, P., O¨quist, G., and Clarke, A. K. (1995) EMBO J. 14, 5457–5466). In the present work we use thermoluminescence to study charge recombination events between the acceptor and donor sides of photosystem II in relation to D1 replacement. The data indicate that in cold-stressed cells exhibiting D1:2, the redox potential of QB becomes lower approaching that of QA. This was confirmed by examining theSynechococcus sp. PCC 7942 inactivation mutants R2S2C3 and R2K1, which possess only D1:1 or D1:2, respectively. In contrast, the recombination of Q A− with the S2 and S3 states did not show any change in their redox characteristics upon the shift from D1:1 to D1:2. We suggest that the change in redox properties of QB results in altered charge equilibrium in favor of QA. This would significantly increase the probability of Q A−and P680+ recombination. The resulting non-radiative energy dissipation within the reaction center of PSII may serve as a highly effective protective mechanism against photodamage upon excessive excitation. The proposed reaction center quenching is an important protective mechanism because antenna and zeaxanthin cycle-dependent quenching are not present in cyanobacteria. We suggest that lowering the redox potential of QB by exchanging D1:1 for D1:2 imparts the increased resistance to high excitation pressure induced by exposure to either low temperature or high light.
@article{sane_transient_2002,
title = {A {Transient} {Exchange} of the {Photosystem} {II} {Reaction} {Center} {Protein} {D1}:1 with {D1}:2 during {Low} {Temperature} {Stress} {ofSynechococcus} sp. {PCC} 7942 in the {Light} {Lowers} the {Redox} {Potential} of {QB}*},
volume = {277},
issn = {0021-9258},
shorttitle = {A {Transient} {Exchange} of the {Photosystem} {II} {Reaction} {Center} {Protein} {D1}},
url = {https://www.sciencedirect.com/science/article/pii/S0021925820744169},
doi = {10/cxhmsg},
abstract = {Upon exposure to low temperature under constant light conditions, the cyanobacterium Synechococcus sp. PCC 7942 exchanges the photosystem II reaction center D1 protein form 1 (D1:1) with D1 protein form 2 (D1:2). This exchange is only transient, and after acclimation to low temperature the cells revert back to D1:1, which is the preferred form in acclimated cells (Campbell, D., Zhou, G., Gustafsson, P., O¨quist, G., and Clarke, A. K. (1995) EMBO J. 14, 5457–5466). In the present work we use thermoluminescence to study charge recombination events between the acceptor and donor sides of photosystem II in relation to D1 replacement. The data indicate that in cold-stressed cells exhibiting D1:2, the redox potential of QB becomes lower approaching that of QA. This was confirmed by examining theSynechococcus sp. PCC 7942 inactivation mutants R2S2C3 and R2K1, which possess only D1:1 or D1:2, respectively. In contrast, the recombination of Q A− with the S2 and S3 states did not show any change in their redox characteristics upon the shift from D1:1 to D1:2. We suggest that the change in redox properties of QB results in altered charge equilibrium in favor of QA. This would significantly increase the probability of Q A−and P680+ recombination. The resulting non-radiative energy dissipation within the reaction center of PSII may serve as a highly effective protective mechanism against photodamage upon excessive excitation. The proposed reaction center quenching is an important protective mechanism because antenna and zeaxanthin cycle-dependent quenching are not present in cyanobacteria. We suggest that lowering the redox potential of QB by exchanging D1:1 for D1:2 imparts the increased resistance to high excitation pressure induced by exposure to either low temperature or high light.},
language = {en},
number = {36},
urldate = {2021-10-19},
journal = {Journal of Biological Chemistry},
author = {Sane, P. V. and Ivanov, Alexander G. and Sveshnikov, Dmitry and Huner, Norman P. A. and O¨quist, Gunnar},
month = sep,
year = {2002},
pages = {32739--32745},
}
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PCC 7942 exchanges the photosystem II reaction center D1 protein form 1 (D1:1) with D1 protein form 2 (D1:2). This exchange is only transient, and after acclimation to low temperature the cells revert back to D1:1, which is the preferred form in acclimated cells (Campbell, D., Zhou, G., Gustafsson, P., O¨quist, G., and Clarke, A. K. (1995) EMBO J. 14, 5457–5466). In the present work we use thermoluminescence to study charge recombination events between the acceptor and donor sides of photosystem II in relation to D1 replacement. The data indicate that in cold-stressed cells exhibiting D1:2, the redox potential of QB becomes lower approaching that of QA. This was confirmed by examining theSynechococcus sp. PCC 7942 inactivation mutants R2S2C3 and R2K1, which possess only D1:1 or D1:2, respectively. In contrast, the recombination of Q A− with the S2 and S3 states did not show any change in their redox characteristics upon the shift from D1:1 to D1:2. We suggest that the change in redox properties of QB results in altered charge equilibrium in favor of QA. This would significantly increase the probability of Q A−and P680+ recombination. The resulting non-radiative energy dissipation within the reaction center of PSII may serve as a highly effective protective mechanism against photodamage upon excessive excitation. The proposed reaction center quenching is an important protective mechanism because antenna and zeaxanthin cycle-dependent quenching are not present in cyanobacteria. We suggest that lowering the redox potential of QB by exchanging D1:1 for D1:2 imparts the increased resistance to high excitation pressure induced by exposure to either low temperature or high light.","language":"en","number":"36","urldate":"2021-10-19","journal":"Journal of Biological Chemistry","author":[{"propositions":[],"lastnames":["Sane"],"firstnames":["P.","V."],"suffixes":[]},{"propositions":[],"lastnames":["Ivanov"],"firstnames":["Alexander","G."],"suffixes":[]},{"propositions":[],"lastnames":["Sveshnikov"],"firstnames":["Dmitry"],"suffixes":[]},{"propositions":[],"lastnames":["Huner"],"firstnames":["Norman","P.","A."],"suffixes":[]},{"propositions":[],"lastnames":["O¨quist"],"firstnames":["Gunnar"],"suffixes":[]}],"month":"September","year":"2002","pages":"32739–32745","bibtex":"@article{sane_transient_2002,\n\ttitle = {A {Transient} {Exchange} of the {Photosystem} {II} {Reaction} {Center} {Protein} {D1}:1 with {D1}:2 during {Low} {Temperature} {Stress} {ofSynechococcus} sp. {PCC} 7942 in the {Light} {Lowers} the {Redox} {Potential} of {QB}*},\n\tvolume = {277},\n\tissn = {0021-9258},\n\tshorttitle = {A {Transient} {Exchange} of the {Photosystem} {II} {Reaction} {Center} {Protein} {D1}},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0021925820744169},\n\tdoi = {10/cxhmsg},\n\tabstract = {Upon exposure to low temperature under constant light conditions, the cyanobacterium Synechococcus sp. PCC 7942 exchanges the photosystem II reaction center D1 protein form 1 (D1:1) with D1 protein form 2 (D1:2). This exchange is only transient, and after acclimation to low temperature the cells revert back to D1:1, which is the preferred form in acclimated cells (Campbell, D., Zhou, G., Gustafsson, P., O¨quist, G., and Clarke, A. K. (1995) EMBO J. 14, 5457–5466). In the present work we use thermoluminescence to study charge recombination events between the acceptor and donor sides of photosystem II in relation to D1 replacement. The data indicate that in cold-stressed cells exhibiting D1:2, the redox potential of QB becomes lower approaching that of QA. This was confirmed by examining theSynechococcus sp. PCC 7942 inactivation mutants R2S2C3 and R2K1, which possess only D1:1 or D1:2, respectively. In contrast, the recombination of Q A− with the S2 and S3 states did not show any change in their redox characteristics upon the shift from D1:1 to D1:2. 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