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Vol. 15, Issue 6, 2674-2683, June 2004

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The Mitochondrial Message-specific mRNA Protectors Cbp1 and Pet309 Are Associated in a High-Molecular Weight Complex

Kirsten Krause ^* , Renata Lopes de Souza , Douglas G.W. Roberts , and Carol L. Dieckmann 

Department of Biochemistry and Molecular Biophysics, University of Arizona, Tucson, Arizona 85721

Submitted February 12, 2004; Revised March 12, 2004; Accepted March 12, 2004
Monitoring Editor: Thomas Fox

In Saccharomyces cerevisiae, the nuclear-encoded protein Cbp1 promotes stability and translation of mitochondrial cytochrome b transcripts through interaction with the 5' untranslated region. Fusion of a biotin binding peptide tag to the C terminus of Cbp1 has now allowed detection in mitochondrial extracts by using peroxidase-coupled avidin. Cbp1 is associated with the mitochondrial membranes when high ionic strength extraction conditions are used. However, the protein is easily solubilized by omitting salt from the extraction buffer, which suggests Cbp1 is loosely associated with the membrane through weak hydrophobic interactions. Gel filtration analysis and blue native PAGE showed that Cbp1 is part of a single 900,000-Da complex. The complex was purified using the biotin tag and a sequence-specific protease cleavage site. In addition to Cbp1, the complex contains several polypeptides of molecular weights between 113 and 40 kDa. Among these, we identified another message-specific factor, Pet309, which promotes the stability and translation of mitochondrial cytochrome oxidase subunit I mRNA. A hypothesis is presented in which the Cbp1–Pet309 complex contains several message-specific RNA binding proteins and links transcription to translation of the mRNAs at the membrane.

^* Present address: Botanisches Institut der Christian-Albrechts-Universität zu Kiel, Am Botanischen Garten 1-9, D-24118 Kiel, Germany

These authors contributed equally to this work.

Present address: Bioreliance Inc., 5 Biotech, 381 Plantation St., Worcester, MA 01605.

Corresponding author. E-mail address: dieckman{at}email.arizona.edu.

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