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- W2047732907 abstract "Abstract The T 44 temperature-sensitive mutant of Chlamydomonas reinhardtii was reported to lack two polypeptides associated with the reaction center of Photosystem II (44–47 kDa) when grown at the non-permissive temperature (37°C) (Shochat, S., Owens, G.C., Hubert, P. and Ohad, I. (1982) Biochim. Biophys. Acta 681, 21–31). The mutant does not synthesize chlorophyll in the dark but greens when exposed to light at both 25 and 37°C. In the present work, we found that the mutant is temperature-sensitive also for the herbicide-binding polypeptide of 32 kDa which is also considered to be the apoprotein of the secondary electron acceptor Q B . The light-dependent degradation of 32 kDa Q B is not impaired at 37°C. The gene transcript coding for the synthesis of this polypeptide is present in cells grown at 37°C in amounts comparable to those found in cells grown at the permissive temperature. Apparently, the T 44 mutant cells do not integrate the 32 kDa Q B polypeptide, either in pre-existing membranes depleted of this polypeptide by photoinhibition or during de novo synthesis of thylakoids when dark-grown cells are greened in the light at 37°C. The 32 kDa Q B polypeptide and electron-flow from water to 2,6-dichlorophenolindophenol (DCIP) are specifically lost, while reduction of silicomolybdate is not affected by photoinhibition. Photoinhibited T 44 cells resume their photosynthetic activity at 25°C, but not at 37°C. The inability to recover Photosystem II (PS II) activity at the non-permissive temperature correlated well with the inability of the T 44 mutant cells to synthesize and/or integrate the 32 kDa Q B polypeptide into the thylakoid membranes." @default.
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- W2047732907 date "1986-04-01" @default.
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- W2047732907 title "Lack of recovery from photoinhibition in a temperature-sensitive Chlamydomonas reinhardtii mutant T44 unable to synthesize and/or integrate the QB protein of Photosystem II at 37°C" @default.
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- W2047732907 doi "https://doi.org/10.1016/0005-2728(86)90094-0" @default.
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