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pH Dependence of Chlorophyll States, Protein Structures and Function of the PSII Membranes

pH Dependence of Chlorophyll States, Protein Structures and Function of the PSII Membranes
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摘要 The effect of varying pH on the photosystem II (PSII) membrane was studied using absorption and steady state fluorescence spectroscopy, and using a variable fluorescence technique. pH variations induced significant changes in the chlorophyll states of the PSII membrane, but no effect was seen on the chlorophyll fluorescence parameter F ′ v/ F ′ m. For acidic pH conditions, protein structures of the PSII membrane were slightly altered, whilst at alkaline pH levels, large changes in the protein structure of the PSII membrane were detected. The results indicate that the microenvironment around Cys in the PSII membrane is very susceptible to alkaline pH conditions, and that in the acid (4≤pH<7) and alkaline (9≥pH>7) regions, pH variation has no effect on the protein structures of the PSII reaction center (RC). The effect of varying pH on the photosystem II (PSII) membrane was studied using absorption and steady state fluorescence spectroscopy, and using a variable fluorescence technique. pH variations induced significant changes in the chlorophyll states of the PSII membrane, but no effect was seen on the chlorophyll fluorescence parameter F ′ v/ F ′ m. For acidic pH conditions, protein structures of the PSII membrane were slightly altered, whilst at alkaline pH levels, large changes in the protein structure of the PSII membrane were detected. The results indicate that the microenvironment around Cys in the PSII membrane is very susceptible to alkaline pH conditions, and that in the acid (4≤pH<7) and alkaline (9≥pH>7) regions, pH variation has no effect on the protein structures of the PSII reaction center (RC).
出处 《Tsinghua Science and Technology》 SCIE EI CAS 2003年第4期493-497,共5页 清华大学学报(自然科学版(英文版)
基金 Supported by the State Key Basic Research and Developm ent Plan (No. G19980 10 10 0 ) and the National Natural Science Foundation of China (No.39890 390 )
关键词 photosystem II (PSII) chlorophyll fluorescence pH treatment photosystem II (PSII) chlorophyll fluorescence pH treatment
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