The human actin-related protein hArp5: Nucleo-cytoplasmic shuttling and involvement in DNA repair

Journal Article · Thu Jan 15 04:00:00 EST 2009 · Experimental Cell Research

DOI:https://doi.org/10.1016/j.yexcr.2008.10.028· OSTI ID:21176157

Kitayama, Kumiko; Kamo, Mariko ^[1]; Oma, Yukako ^[1]; Matsuda, Ryo ^[1]; Uchida, Takafumi ^[2]; Ikura, Tsuyoshi ^[3]; Tashiro, Satoshi ^[4]; Ohyama, Takashi ^[5]; Winsor, Barbara ^[6]; Harata, Masahiko ^[1]

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1. Laboratory of Molecular Biology, Graduate School of Agricultural Science, Tohoku University, Tsutsumidori-Amamiyamachi 1-1, Aoba-ku, Sendai 981-8555 (Japan)
2. Enzymology, Graduate School of Agricultural, Tohoku University, Tsutsumidori-Amamiyamachi 1-1, Aoba-ku, Sendai 981-8555 (Japan)
3. Department of Biochemistry, Tohoku University Graduate School of Medicine, Seiryoumachi 2 2-1, Aoba-ku, Sendai 980-8575 (Japan)
4. Department of Cellular Biology, Hiroshima University, Hiroshima 734-8553 (Japan)
5. Department of Biology, Faculty of Education and Integrated Arts and Sciences, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480 (Japan)
6. Department of Molecular and Cellular Genetics, UMR7156 CNRS-ULP, University of Strasbourg, 67084 Strasbourg cedex (France)

Certain actin-related proteins (Arps) of budding yeast are localized in the nucleus, and have essential roles as stoichiometric components of histone acetyltransferase (HAT) and chromatin remodeling complexes. On the other hand, identification of vertebrate nuclear Arps and their functional analyses are just beginning. We show that human Arp5 (hArp5) proteins are localized in the nucleus, and that arp5{delta} yeast cells are partially complemented by hArp5. Thus, hArp5 is a novel member of the nuclear Arps of vertebrates, which possess evolutionarily conserved functions from yeast to humans. We show here that hArp5 shuttles between the nucleus and the cytoplasm. Furthermore, after the induction of DNA double strand breaks (DSB), cell growth and the accumulation of phosphorylated histone H2AX ({gamma}-H2AX) are impaired by hArp5 depletion. Association of hArp5 with the hIno80 chromatin remodeling enzyme and decrease of chromatin-bound hIno80 by hArp5-depletion indicate that hArp5 may have a role in the recruitment of the hINO80 complex to chromatin. Overexpression of hArp5 and hIno80 enhanced {gamma}-H2AX accumulation. These observations suggest that hArp5 is involved in the process of DSB repair through the regulation of the chromatin remodelling machinery.

• OSTI ID: 21176157
• Journal Information: Experimental Cell Research, Journal Name: Experimental Cell Research Journal Issue: 2 Vol. 315; ISSN 0014-4827; ISSN ECREAL
• Country of Publication: United States
• Language: English

Related Subjects

60 APPLIED LIFE SCIENCES
ACTIN
CHROMATIN
CYTOPLASM
DNA REPAIR
ENZYMES
FUNCTIONAL ANALYSIS
STOICHIOMETRY
STRAND BREAKS
VERTEBRATES
YEASTS