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THE PLANT CELL, Vol 9, Issue 5 773-782, Copyright © 1997 by American Society of Plant Biologists
A Nuclear-Encoded Function Essential for Translation of the Chloroplast psaB mRNA in Chlamydomonas
O. Stampacchia, J. Girard-Bascou, J. L. Zanasco, W. Zerges, P. Bennoun and J. D. Rochaix
Department of Molecular and Plant Biology, University of Geneva, 30 quai Ernest-Ansermet, CH 1211 Geneva 4, Switzerland
We report the analysis of a photosystem I-deficient mutant of Chlamydomonas
reinhardtii, F15, that contains a mutation at the TAB1 (for translation of
psaB mRNA) nuclear locus. Pulse labeling of chloroplast proteins revealed
that the synthesis of the two photosystem I reaction center polypeptides
PSAA and PSAB was undetectable in this mutant. The mRNA levels of these
proteins were only moderately reduced, suggesting that the primary defect
occurs at a step during or after translation. We constructed chimeric genes
consisting of the psaA and psaB 5[prime] untranslated region (5[prime] UTR)
fused to the aminoglycoside adenyltransferase (aadA) coding sequence, which
confers spectinomycin resistance. Insertion of these genes into the
chloroplast genome through biolistic transformation and analysis of their
expression in the TAB1 mutant nuclear background revealed that the psaB
(but not the psaA) 5[prime] UTR is the target of the wild-type TAB1
function. This suggests that TAB1 is required for the initiation of psaB
mRNA translation. The dependence of PSAA synthesis or accumulation on PSAB
synthesis is strongly suggested by the identification of a suppressor
mutation within the psaB 5[prime] UTR. The suppressor specifically restores
the synthesis of both proteins in the presence of the tab1-F15 mutation.
The location of the suppressor mutation within a putative base-paired
region near the psaB initiation codon suggests a role for TAB1 in the
activation of translation of the psaB mRNA.
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