The amino-terminal TPR domain of Dia2 tethers SCFDia2 to the replisome progression complex

Hiroko Morohashi, Timurs Maculins, Karim Labib (Lead / Corresponding author)

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    63 Citations (Scopus)


    Eukaryotic cells contain multiple versions of the E3 ubiquitin ligase known as the SCF (Skp1/cullin/F box), each of which is distinguished by a different F box protein that uses a domain at the carboxyl terminus to recognize substrates [1, 2]. The F box protein Dia2 is an important determinant of genome stability in budding yeast [3-5], but its mode of action is poorly understood. Here we show that SCF(Dia2) associates with the replisome progression complex (RPC) that assembles around the MCM2-7 helicase at DNA replication forks [6]. This interaction requires the RPC components Mrc1 and Ctf4, both of which associate with a tetratricopeptide repeat (TPR) domain located at the amino terminus of Dia2. Our data indicate that the TPR domain of Dia2 tethers SCF(Dia2) to the RPC, probably increasing the local concentration of the ligase at DNA replication forks. This regulation becomes important in cells that accumulate stalled DNA replication forks at protein-DNA barriers, perhaps aiding the interaction of SCF(Dia2) with key substrates. Our findings suggest that the amino-terminal domains of other F box proteins might also play an analogous regulatory role, controlling the localization of the cognate SCF complexes.
    Original languageEnglish
    Pages (from-to)1943-1949
    Number of pages7
    JournalCurrent Biology
    Issue number22
    Publication statusPublished - 1 Dec 2009


    • Base Sequence
    • F-Box Proteins
    • Genes, Fungal
    • Two-Hybrid System Techniques
    • Saccharomyces cerevisiae Proteins
    • DNA Primers
    • Molecular Sequence Data
    • Immunoprecipitation
    • Flow Cytometry
    • Amino Acid Sequence
    • DNA Replication
    • Saccharomyces cerevisiae


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