title: Schizosaccharomyces pombe Ddb1 recruits substrate-specific adaptor proteins through a novel protein motif, the DDB-box.
abstract: DDB1 was isolated as a UV-damaged DNA-binding protein, but recent studies established that it plays a role as a component of cullin 4A ubiquitin ligases. Cullin-RING complexes are the largest known ubiquitin ligase family, with hundreds of substrate-specific adaptor subunits and which are defined by characteristic motifs. A common motif for DDB1/cullin 4 ubiquitin ligases, a WDXR motif, was recently reported. Here, we show that Schizosaccharomyces pombe Ddb1 associates with several WD40 repeat proteins that share a novel protein motif designated the DDB-box, a motif essential for interaction with Ddb1 and independent of WD40 repeats, unlike the WDXR motif. We also show that ddb1(+) and the putative CSA homolog ckn1(+) are involved in transcription-coupled nucleotide excision repair and that the DDB-box is essential for the ckn1(+) function in vivo. These data indicate that the DDB-box is another common motif which defines adaptor proteins for DDB1/cullin 4 ubiquitin ligases.
authors.affiliation: Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan. fumio.hanaoka@gakushuin.ac.jp.
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Fukumoto
authors.forename: Naoshi
authors.initials: N
authors.lastname: Dohmae
authors.forename: Fumio
authors.initials: F
authors.lastname: Hanaoka
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D002460:Cell Line; D004249:DNA Damage; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D046911:Macromolecular Substances / Q000378:metabolism; D008969:Molecular Sequence Data; D012568:Schizosaccharomyces / Q000235:genetics / Q000378:metabolism*; D029702:Schizosaccharomyces pombe Proteins / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D014158:Transcription, Genetic; D014466:Ultraviolet Rays
chemical_list: D004268:DNA-Binding Proteins; C500125:Ddb1 protein, S pombe; D046911:Macromolecular Substances; D029702:Schizosaccharomyces pombe Proteins
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