کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1943066 | 1052644 | 2009 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Interaction of methylamine with extrinsic and intrinsic subunits of photosystem II Interaction of methylamine with extrinsic and intrinsic subunits of photosystem II](/preview/png/1943066.png)
The interaction of methylamine with chloroplasts' photosystem II (PSII) was studied in isolated thylakoid membranes. Low concentration of methylamine (mM range) was shown to affect water oxidation and the advancement of the S-states. Modified kinetics of chlorophyll fluorescence rise and thermoluminescence in the presence of methylamine indicated that the electron transfer was affected at both sides of PSII, and in particular the electron transfer between YZ and P680+. As the concentration of methylamine was raised above 10 mM, the extrinsic polypeptides associated with the oxygen-evolving complex were lost and energy transfer between PSII antenna complexes and reaction centers was impaired. It was concluded that methylamine is able to affect both extrinsic and intrinsic subunits of PSII even at the lowest concentrations used where the extrinsic polypeptides of the OEC are still associated with the luminal side of the photosystem. As methylamine concentration increases, the extrinsic polypeptides are lost and the interaction with intrinsic domains is amplified resulting in an increased F0.
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1787, Issue 10, October 2009, Pages 1223–1229