Multiple translational control sequences in the 5' leader of the chloroplast psbC mRNA interact with nuclear gene products in Chlamydomonas reinhardtii.

Abstract:

:Translation of the chloroplast psbC mRNA in the unicellular eukaryotic alga Chlamydomonas reinhardtii is controlled by interactions between its 547-base 5' untranslated region and the products of the nuclear loci TBC1, TBC2, and possibly TBC3. In this study, a series of site-directed mutations in this region was generated and the ability of these constructs to drive expression of a reporter gene was assayed in chloroplast transformants that are wild type or mutant at these nuclear loci. Two regions located in the middle of the 5' leader and near the initiation codon are important for translation. Other deletions still allow for partial expression of the reporter gene in the wild-type background. Regions with target sites for TBC1 and TBC2 were identified by estimating the residual translation activity in the respective mutant backgrounds. TBC1 targets include mostly the central part of the leader and the translation initiation region whereas the only detected TBC2 targets are in the 3' part. The 5'-most 93 nt of the leader are required for wild-type levels of transcription and/or mRNA stabilization. The results indicate that TBC1 and TBC2 function independently and further support the possibility that TBC1 acts together with TBC3.

journal_name

Genetics

journal_title

Genetics

authors

Zerges W,Auchincloss AH,Rochaix JD

keywords:

subject

Has Abstract

pub_date

2003-03-01 00:00:00

pages

895-904

issue

3

eissn

0016-6731

issn

1943-2631

journal_volume

163

pub_type

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