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J Biol Chem, Vol. 273, Issue 33, 20935-20940, August 14, 1998
From the Department of Botany, University of Munich, 80638 München, Menzinger Straße 67, Federal Republic of Germany
Upon transfer of lysed chloroplasts from darkness
to light, the accumulation of membrane and stromal chloroplast proteins is strictly regulated at the level of translation elongation. In
darkness, translation elongation is retarded even in the presence of
exogenously added ATP and dithiothreitol. In the light, addition of the
electron transport inhibitor 3-(3,4-dichlorophenyl)-1,1-dimethyl urea
inhibits translation elongation even in the presence of ATP. This
inhibition can be overcome by addition of artificial electron donors in
the presence of light, but not in darkness. Electron flow between
photosystem II and I induced by far red light of 730 nm is sufficient
for the activation of translation elongation. This activation can also
be obtained by electron donors to photosystem I, which transport
protons into the thylakoid lumen. Release of the proton gradient by
uncouplers prevents the light-dependent activation of
translation elongation. Also, the induction of translation activation is switched off rapidly upon transfer from light to darkness. Hence, we propose that the formation of a photosynthetic proton gradient across the thylakoid membrane activates translation elongation in chloroplasts.
Light-dependent Formation of the Photosynthetic
Proton Gradient Regulates Translation Elongation in Chloroplasts
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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