LIGHT-REGULATED TRANSLATION OF CHLOROPLAST MESSENGER-RNAS THROUGH REDOX POTENTIAL

Translation of key proteins in the chloroplast is regulated by light. Genetic and biochemical studies in the unicellular alga Chlamydomonas reinhardtii suggest that light may regulate translation by modulating the binding of activator proteins to the 5' untranslated region of chl oroplast messenger RNAs. in vitro binding of the activator proteins to psbA messenger RNA and in vivo translation of psbA messenger RNA is r egulated by the redox state of these proteins, suggesting that the lig ht stimulus is transduced by the photosynthesis-generated redox potent ial.