Isolation of an Arabidopsis thaliana cDNA by complementation of a yeast abc1 deletion mutant deficient in complex III respiratory activity

B. Cardazzo, P. Hamel, W. Sakamoto, H. Wintz, G. Dujardin

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    37 Citations (Scopus)

    Abstract

    The yeast Abc1 protein acts as a chaperone-like protein essential for the proper conformation and efficient functioning of the respiratory complex III. By functional complementation of a yeast abc1 mutant, we have identified an Arabidopsis thaliana cDNA that corresponds to a single copy gene and encodes a protein sharing 45% similarity with the yeast Abc1p protein. Cytochrome spectra and respiratory activity measurements have shown that the plant protein allows a partial restoration of the complex III activity. No major difference in the steady-state level of ABC1At mRNA was observed in various plant tissues, suggesting that ABC1At is constitutively expressed in A. thaliana. Phylogenetic analysis revealed that the Abc1At protein belongs to a large family of proteins composed of two eukaryotic and one prokaryotic subgroups differing by their degree of similarity and probably by their function.

    Original languageEnglish
    Pages (from-to)117-125
    Number of pages9
    JournalGene
    Volume221
    Issue number1
    DOIs
    Publication statusPublished - Oct 9 1998

    Keywords

    • ABC1
    • Complex III biogenesis
    • Evolutionary conservation
    • Mitochondria
    • Saccharomyces cerevisiae

    ASJC Scopus subject areas

    • Genetics

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