Figure 2. The 1–167 domain of Suv39h1 is responsible for promoting HP1α sumoylation.
(a) Far-western blot using His-Suv39h1 full-length (WT) or truncated versions as baits and purified recombinant GST-Ubc9 as prey. We revealed bound GST-Ubc9 using anti-GST antibodies. Along each construct, interaction (+) or absence of interaction (−) with Ubc9 is indicated. (b) In vitro HP1α sumoylation assay. Top: western blot analysis of the sumoylation reaction mixture with anti-HP1α antibodies revealed sumoylated GST-HP1α (SUMO-1-GST-HP1α, box) and unmodified GST-HP1α. We performed quantitative analysis of this assay. The histogram shows the comparison of the ratio between SUMO-1-GST-HP1α and unmodified HP1α signal from western blot in the presence of Suv39h1-WT or truncated versions (Supplementary Fig. 5c). Error bars represent s.d. from three independent experiments. Bottom: results summary.
