A plant outer mitochondrial membrane protein with high amino acid sequence identity to a chloroplast protein import receptor

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<jats:p>We have identified a novel protein on the outer membrane of <jats:italic>Arabidopsis thaliana</jats:italic> mitochondria. This protein displays 67% sequence identity with the 64 kDa translocase of the outer envelope membrane of chloroplasts (Toc). A mitochondrial localisation for this protein was determined by (i) its presence in the proteome of highly purified <jats:italic>Arabidopsis</jats:italic> mitochondria, (ii) Western blot analysis with antibodies to Toc64 from pea that indicate its presence in <jats:italic>Arabidopsis</jats:italic> and pea mitochondria, (iii) green fluorescent protein fusion proteins that indicate an exclusive mitochondrial localisation for this protein, and (iv) expression profiles in various tissue types and during development that are more similar to translocase of the outer mitochondrial membrane components than to chloroplastic Toc components. Thus <jats:italic>Arabidopsis</jats:italic> mitochondria contain a protein with high sequence identity to a plastid protein import receptor.</jats:p>

Journal

  • FEBS Letters

    FEBS Letters 557 (1-3), 109-114, 2003-12-16

    Wiley

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