title: Recombination activator function of the novel RAD51- and RAD51B-binding protein, human EVL.
abstract: The RAD51 protein is a central player in homologous recombinational repair. The RAD51B protein is one of five RAD51 paralogs that function in the homologous recombinational repair pathway in higher eukaryotes. In the present study, we found that the human EVL (Ena/Vasp-like) protein, which is suggested to be involved in actin-remodeling processes, unexpectedly binds to the RAD51 and RAD51B proteins and stimulates the RAD51-mediated homologous pairing and strand exchange. The EVL knockdown cells impaired RAD51 assembly onto damaged DNA after ionizing radiation or mitomycin C treatment. The EVL protein alone promotes single-stranded DNA annealing, and the recombination activities of the EVL protein are further enhanced by the RAD51B protein. The expression of the EVL protein is not ubiquitous, but it is significantly expressed in breast cancer-derived MCF7 cells. These results suggest that the EVL protein is a novel recombination factor that may be required for repairing specific DNA lesions, and that may cause tumor malignancy by its inappropriate expression.
authors.affiliation: Laboratory of Structural Biology, Graduate School of Advanced Science and Engineering, and Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan.
authors.forename: Motoki
authors.initials: M
authors.lastname: Takaku
authors.forename: Shinichi
authors.initials: S
authors.lastname: Machida
authors.forename: Noriko
authors.initials: N
authors.lastname: Hosoya
authors.forename: Shugo
authors.initials: S
authors.lastname: Nakayama
authors.forename: Yoshimasa
authors.initials: Y
authors.lastname: Takizawa
authors.forename: Isao
authors.initials: I
authors.lastname: Sakane
authors.forename: Takehiko
authors.initials: T
authors.lastname: Shibata
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Miyagawa
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kurumizaka