TY - JOUR
T1 - Photoinhibition of photosystem II under environmental stress
AU - Murata, Norio
AU - Takahashi, Shunichi
AU - Nishiyama, Yoshitaka
AU - Allakhverdiev, Suleyman I.
N1 - Funding Information:
This work was supported, in part, by a Research Fellowship from the Japan Society (JSPS) for the Promotion of Science for JSPS Postdoctoral Fellowship for Research Abroad (to S.T.), by a Grant-in-Aid for Scientific Research (no. 17570040 to Y.N.) from the Ministry of Education, Culture, Sports, Sciences, and Technology of Japan, by grants from the Russian Foundation for Basic Research (no 05-04-49672) and Molecular and Cell Biology Programs from Russian Academy of Sciences (to S.I.A.), and by the Cooperative Research Program on Stress Tolerant Plants of the National Institute for Basic Biology.
PY - 2007/6
Y1 - 2007/6
N2 - Inhibition of the activity of photosystem II (PSII) under strong light is referred to as photoinhibition. This phenomenon is due to an imbalance between the rate of photodamage to PSII and the rate of the repair of damaged PSII. In the "classical" scheme for the mechanism of photoinhibition, strong light induces the production of reactive oxygen species (ROS), which directly inactivate the photochemical reaction center of PSII. By contrast, in a new scheme, we propose that photodamage is initiated by the direct effect of light on the oxygen-evolving complex and that ROS inhibit the repair of photodamaged PSII by suppressing primarily the synthesis of proteins de novo. The activity of PSII is restricted by a variety of environmental stresses. The effects of environmental stress on damage to and repair of PSII can be examined separately and it appears that environmental stresses, with the exception of strong light, act primarily by inhibiting the repair of PSII. Studies have demonstrated that repair-inhibitory stresses include CO2 limitation, moderate heat, high concentrations of NaCl, and low temperature, each of which suppresses the synthesis of proteins de novo, which is required for the repair of PSII. We postulate that most types of environmental stress inhibit the fixation of CO2 with the resultant generation of ROS, which, in turn, inhibit protein synthesis.
AB - Inhibition of the activity of photosystem II (PSII) under strong light is referred to as photoinhibition. This phenomenon is due to an imbalance between the rate of photodamage to PSII and the rate of the repair of damaged PSII. In the "classical" scheme for the mechanism of photoinhibition, strong light induces the production of reactive oxygen species (ROS), which directly inactivate the photochemical reaction center of PSII. By contrast, in a new scheme, we propose that photodamage is initiated by the direct effect of light on the oxygen-evolving complex and that ROS inhibit the repair of photodamaged PSII by suppressing primarily the synthesis of proteins de novo. The activity of PSII is restricted by a variety of environmental stresses. The effects of environmental stress on damage to and repair of PSII can be examined separately and it appears that environmental stresses, with the exception of strong light, act primarily by inhibiting the repair of PSII. Studies have demonstrated that repair-inhibitory stresses include CO2 limitation, moderate heat, high concentrations of NaCl, and low temperature, each of which suppresses the synthesis of proteins de novo, which is required for the repair of PSII. We postulate that most types of environmental stress inhibit the fixation of CO2 with the resultant generation of ROS, which, in turn, inhibit protein synthesis.
KW - Environmental stress
KW - Photodamage
KW - Photoinhibition
KW - Photosystem II
KW - Protein synthesis
KW - Repair
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U2 - 10.1016/j.bbabio.2006.11.019
DO - 10.1016/j.bbabio.2006.11.019
M3 - Review article
C2 - 17207454
AN - SCOPUS:34249787332
VL - 1767
SP - 414
EP - 421
JO - Biochimica et Biophysica Acta - Bioenergetics
JF - Biochimica et Biophysica Acta - Bioenergetics
SN - 0005-2728
IS - 6
ER -