CytochromefTranslation in Chlamydomonas Chloroplast Is Autoregulated by its Carboxyl-Terminal Domain[W]
- 1 June 2003
- journal article
- Published by Oxford University Press (OUP) in Plant Cell
- Vol. 15 (6), 1443-1454
- https://doi.org/10.1105/tpc.011692
Abstract
The rate of synthesis of cytochrome f is decreased ∼10-fold when it does not assemble with the other subunits of the cytochrome b6f complex in Chlamydomonas reinhardtii chloroplasts. This assembly-mediated regulation of cytochrome f synthesis corresponds to a regulation of petA mRNA initiation of translation. Here, we demonstrate that cytochrome f translation is autoregulated by its C-terminal domain. Five cytochrome f residues conserved throughout all chloroplast genomes—residue Gln-297 in the transmembrane helix and a cluster of four amino acids, Lys-Gln-Phe-Glu, at positions 305 to 308, in the stromal extension—participate in the formation of a translation repressor motif. By contrast, positively charged residues in the stromal extension have little influence on the autoregulation process. These results do not favor a direct interaction between the repressor motif and the petA 5′ untranslated region but suggest the participation of a membrane-bound ternary effector.Keywords
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