title: Association of human RAD52 protein with transcription factors.
abstract: The human RAD52 protein has been implicated in DNA homologous recombination. Four major functional domains have been identified: a DNA binding domain (amino acids 1-85), a self-association and UBC9-interacting domain (amino acids 85-159), an RPA-interacting domain (amino acids 221-280), and a RAD51-interacting domain (amino acids 287-330). However, it is uncertain about the functional roles of the C-terminal region of RAD52 protein. In this report, we demonstrate an association of a C-terminal domain of human RAD52 (amino acids 302-418) with the XPB and XPD subunits of transcription factor TFIIH and RNA polymerase II (RNAPII). Using a Gal-4 binding based transcription assay, we further show that this C-terminal domain activates transcription. However, the RAD52 self-association domain suppresses transcription, resulting in an overall activity of transcriptional suppression by the full-length RAD52 protein. These results suggest a novel activity of RAD52 in transcription regulation and may further imply a functional role of RAD52 in targeting DNA damage on transcription active loci to recombinational repair.
authors.affiliation: Department of Molecular Genetics and Microbiology, University of New Mexico School of Medicine, 915 Camino de Salud, NE, Albuquerque, NM 87131, USA.
authors.forename: Jingmei
authors.initials: J
authors.lastname: Liu
authors.forename: Xiangbing
authors.initials: X
authors.lastname: Meng
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Shen
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D019556:COS Cells; D002460:Cell Line; D004249:DNA Damage; D004265:DNA Helicases; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D006801:Humans; D015151:Immunoblotting; D008969:Molecular Sequence Data; D010957:Plasmids / Q000378:metabolism; D011233:Precipitin Tests; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011506:Proteins / Q000378:metabolism; D012319:RNA Polymerase II / Q000737:chemistry* / Q000378:metabolism; D051721:Rad52 DNA Repair and Recombination Protein; D051758:Transcription Factor TFIIH; D014157:Transcription Factors / Q000378:metabolism*; D019473:Transcription Factors, TFII / Q000737:chemistry* / Q000378:metabolism; D014158:Transcription, Genetic; D051759:Xeroderma Pigmentosum Group D Protein
chemical_list: D004268:DNA-Binding Proteins; D011506:Proteins; C497194:RAD52 protein, human; D051721:Rad52 DNA Repair and Recombination Protein; D014157:Transcription Factors; D019473:Transcription Factors, TFII; C072022:XPBC-ERCC-3 protein; D051758:Transcription Factor TFIIH; D012319:RNA Polymerase II; D004265:DNA Helicases; D051759:Xeroderma Pigmentosum Group D Protein; C497292:ERCC2 protein, human