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The chloroplast-derived trnW and trnM-e genes are not expressed in Arabidopsis mitochondria.

Authors
  • Duchêne, A M
  • Maréchal-Drouard, L
Type
Published Article
Journal
Biochemical and biophysical research communications
Publication Date
Aug 03, 2001
Volume
285
Issue
5
Pages
1213–1216
Identifiers
PMID: 11478784
Source
Medline
License
Unknown

Abstract

Depending on their genetic origin, plant mitochondrial tRNAs are classified into three categories: the "native" and "chloroplast-like" mitochondrial-encoded tRNAs and the imported nuclear-encoded tRNAs. The number and identity of tRNAs in each category change from one plant specie to another. As some plant mitochondrial trn genes were found to be not expressed, and as all Arabidopsis thaliana mitochondrial trn genes are known, we systematically tested the expression of A. thaliana mitochondrial trn genes. Both the "chloroplast-like" trnW and trnM-e genes were found to be not expressed. These exceptions are remarkable since trnW and trnM-e are expressed in the mitochondria of other land plants. Whereas we could not conclude which tRNA(Met) compensates the lack of expression of trnM-e, we showed that the cytosolic tRNA(Trp) is present in A. thaliana mitochondria, thus compensating the absence of expression of the mitochondrial-encoded trnW.

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