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. 1994 Aug;105(4):1355–1364. doi: 10.1104/pp.105.4.1355

The Role of Plastids in the Expression of Nuclear Genes for Thylakoid Proteins Studied with Chimeric [beta]-Glucuronidase Gene Fusions.

C Bolle 1, S Sopory 1, T Lubberstedt 1, R B Klosgen 1, R G Herrmann 1, R Oelmuller 1
PMCID: PMC159468  PMID: 12232290

Abstract

We have analyzed plastid and nuclear gene expression in tobacco seedlings using the carotenoid biosynthesis inhibitor nor-flurazon. mRNA levels for three nuclear-encoded chlorophyll-binding proteins of photosystem I and photosystem II (CAB I and II and the CP 24 apoprotein) are no longer detectable in photobleached seedlings, whereas those for other components of the thylakoid membrane (the 33- and 23-kD polypeptides and Rieske Fe/S polypeptide) accumulate to some extent. Transgenic tobacco seedlings with promoter fusions from genes for thylakoid membrane proteins exhibit a similar expression behavior: a CAB-[beta]-glucuronidase (GUS) gene fusion is not expressed in herbicide-treated seedlings, whereas PC-, FNR-, PSAF-, and ATPC-promoter fusions are expressed, although at reduced levels. All identified segments in nuclear promoters analyzed that have been shown to respond to light also respond to photodamage to the plastids. Thus, the regulatory signal pathways either merge prior to gene regulation or interact with closely neighboring cis elements. These results indicate that plastids control nuclear gene expression via different and gene-specific cis-regulatory elements and that CAB gene expression is different from the expression of the other genes tested. Finally, a plastid-directing import sequence from the maize Waxy gene is capable of directing the GUS protein into the photodamaged organelle. Therefore, plastid import seems to be functional in photobleached organelles.

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Selected References

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