title: Association of human DNA helicase RecQ5beta with RNA polymerase II and its possible role in transcription.
abstract: Although RecQ5beta is a ssDNA (single-stranded DNA)-stimulated ATPase and an ATP-dependent DNA helicase with strand-annealing activities, its cellular function remains to be explored. In the present paper, we used immunopurification and MS-based analyses to show that human DNA helicase RecQ5beta is associated with at least four RNAP II (RNA polymerase II) subunits. RecQ5beta was also present in complexes immunoprecipitated using three different antibodies against the large subunit of RNAP II, or in complexes immunoprecipitated using an anti-FLAG antibody against either FLAG-RNAP II 33 kDa subunit or FLAG-Pin1. Different regions of the non-helicase domain of the RecQ5beta molecule were associated with hypophosphorylated and hyperphosphorylated forms of the RNAP II large subunit independently of DNA and RNA. RecQ5beta was also found in nuclear chromatin fractions and associated with the coding regions of the LDL (low-density lipoprotein) receptor and beta-actin genes. Knockdown of the RecQ5beta transcript increased the transcription of those genes. The results of the present study suggest that RecQ5beta has suppressive roles in events associated with RNAP II-dependent transcription.
authors.affiliation: Department of Bioengineering, United Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan.
authors.forename: Keiichi
authors.initials: K
authors.lastname: Izumikawa
authors.forename: Mitsuaki
authors.initials: M
authors.lastname: Yanagida
authors.forename: Toshiya
authors.initials: T
authors.lastname: Hayano
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Tachikawa
authors.forename: Wataru
authors.initials: W
authors.lastname: Komatsu
authors.forename: Akira
authors.initials: A
authors.lastname: Shimamoto
authors.forename: Kazunobu
authors.initials: K
authors.lastname: Futami
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Furuichi
authors.forename: Takashi
authors.initials: T
authors.lastname: Shinkawa
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Yamauchi
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Isobe
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Takahashi
mesh_terms: D002460:Cell Line; D047369:Chromatin Immunoprecipitation; D006367:HeLa Cells; D006801:Humans; D015151:Immunoblotting; D007150:Immunohistochemistry; D047468:Immunoprecipitation; D016133:Polymerase Chain Reaction; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D012319:RNA Polymerase II / Q000737:chemistry / Q000378:metabolism*; D053484:RecQ Helicases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014158:Transcription, Genetic; D014461:Ultracentrifugation
chemical_list: C506732:RECQL5 protein, human; D012319:RNA Polymerase II; D053484:RecQ Helicases