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. 2020 Jan 17;9:e53402. doi: 10.7554/eLife.53402

Figure 1. Kif2C associates with DNA double strands breaks and DNA repair proteins.

(A) Beads conjugated with a biotin-double stranded DNA fragment (dsDNA, 500 bp, as described in Materials and methods—DNA binding assay) were incubated in Xenopus egg extracts for 30 min, re-isolated, and resolved by SDS-PAGE. The input, control pull-down (with blank beads), and biotin-dsDNA pull-down were analyzed by immunoblotting. (B) Beads conjugated with biotin-dsDNA (as in panel A) were incubated in HeLa cell lysates for 30 min, re-isolated, and resolved by SDS-PAGE. The input, control pull-down (with blank beads), and biotin-dsDNA pull-down were analyzed by immunoblotting. (C) Xenopus Kif2C was expressed with MBP-tag, and purified on amylose beads. As described in Materials and methods—pull-down assay, MBP-Kif2C or control (blank) beads were incubated in Xenopus egg extracts supplemented with cut or uncut plasmid, re-isolated, and analyzed by PCR and agarose gel electrophoresis/ethidium bromide staining. (D) As described in Materials and methods—pull-down assay, human Kif2C was expressed with MBP-tag and purified on amylose beads. MBP-Kif2C or control (blank) beads were incubated in the lysates of doxorubicin-treated HeLa cells. Pull-down samples were analyzed by mass spectrometry. The identified DNA repair proteins and numbers of peptides are shown. (E) GFP-Kif2C was expressed in HeLa cells with doxorubicin-treatment. Immunoprecipitation (IP) was performed using anti-GFP or control (blank) beads. 10% input, control and GFP IP samples were analyzed by immunoblotting.

Figure 1.

Figure 1—figure supplement 1. Kif2C associates with DNA repair proteins.

Figure 1—figure supplement 1.

(A) MBP-Kif2C pull down was performed in HeLa cells with or without doxorubicin (2 μg/mL) treatment. Input, control pulldown with blank beads, and MBP pulldown samples were analyzed by immunoblotting. (B) Doxorubicin treatment, as in panel A, activated DNA damage signaling, as indicated by Chk1 phosphorylation at Ser-317. (C) MBP-Kif2C pull down was performed in HeLa cells as in panel A. Cell lysates were incubated with DNase I (100 units/mL) as indicated. Input, control pulldown with blank beads, and MBP pulldown samples were analyzed by immunoblotting. (D,E) The N, M, C segments of Kif2C, as shown in panel D, were used for pull-down in the lysates of HeLa cells treated with doxorubicin. Control (ctr) pull-down was performed using blank beads. Immunoblots are shown in panel E.