Molecular Biology and Evolution 19:2039-2050 (2002)
© 2002 Society for Molecular Biology and Evolution
Comparative Genomics of the RBR Family, Including the Parkinson's Disease–Related Gene Parkin and the Genes of the Ariadne Subfamily
*Departamento de Genética, Universidad de Valencia, Burjassot, Valencia, Spain;
Instituto Cajal, Consejo Superior de Investigaciones Científicas, Madrid
Genes of the RBR family are characterized by the RBR signature (two RING finger domains separated by an IBR/DRIL domain). The RBR family is widespread in eukaryotes, with numerous members in animals (mammals, Drosophila, Caenorhabditis) and plants (Arabidopsis). But yeasts, such as Saccharomyces cerevisiae or Schizosaccharomyces pombe, contain only two RBR genes. We determined the phylogenetic relationships and the most likely orthologs in different species of several family members for which functional data are available. These include: (1) parkin, whose mutations are involved in forms of familial Parkinson's disease; (2) the ariadne genes, recently characterized in Drosophila and mammals; (3) XYbp and Dorfin, two mammalian genes whose products interact with the centrosome; (4) XAP3, RBCK1, and UIP28, mammalian genes encoding Protein Kinase-C–binding proteins; and (5) ARA54, an androgen receptor coactivator. Because several of these genes are involved in ubiquitination, we used phylogenetic and structural analyses to explore the hypothesis that all RBR proteins might play a role in ubiquitination. We show that the involvement of RBR proteins in ubiquitination predates the animals-plants-fungi divergence. On the basis of the evidence provided by cases of gene fusion, we suggest that Ariadne proteins interact with cullin domain–containing proteins to form complexes with ubiquitin-ligase activity.
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