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Molecular and Cellular Biology, October 2002, p. 6726-6734, Vol. 22, No. 19
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.19.6726-6734.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Recognition of RNA Editing Sites Is Directed by Unique Proteins in Chloroplasts: Biochemical Identification of cis-Acting Elements and trans-Acting Factors Involved in RNA Editing in Tobacco and Pea Chloroplasts

Tetsuya Miyamoto,1 Junichi Obokata,1 and Masahiro Sugiura2*

Center for Gene Research, Nagoya University, Nagoya 464-8602,1 Graduate School of Natural Sciences, Nagoya City University, Yamanohata, Mizuho, Nagoya 467-8501, Japan2

Received 4 March 2002/ Returned for modification 13 May 2002/ Accepted 20 June 2002

RNA editing in higher-plant chloroplasts involves C-to-U conversions at specific sites. Although in vivo analyses have been performed, little is known about the biochemical aspects of chloroplast editing reactions. Here we improved our original in vitro system and devised a procedure for preparing active chloroplast extracts not only from tobacco plants but also from pea plants. Using our tobacco in vitro system, cis-acting elements were defined for psbE and petB mRNAs. Distinct proteins were found to bind specifically to each cis-element, a 56-kDa protein to the psbE site and a 70-kDa species to the petB site. Pea chloroplasts lack the corresponding editing site in psbE since T is already present in the DNA. Parallel in vitro analyses with tobacco and pea extracts revealed that the pea plant has no editing activity for psbE mRNAs and lacks the 56-kDa protein, whereas petB mRNAs are edited and the 70-kDa protein is also present. Therefore, coevolution of an editing site and its cognate trans-factor was demonstrated biochemically in psbE mRNA editing between tobacco and pea plants.


* Corresponding author. Mailing address: Graduate School of Natural Sciences, Nagoya City University, Yamanohata, Mizuho, Nagoya 467-8501, Japan. Phone: 81-52-872-6021. Fax: 81-52-872-6021. E-mail: sugiura{at}nsc.nagoya-cu.ac.jp.


Molecular and Cellular Biology, October 2002, p. 6726-6734, Vol. 22, No. 19
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.19.6726-6734.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




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