Dimeric disintegrins from the Vipera ursinii steppe viper venom

Four dimeric disintegrins were isolated from the venom of the steppe viper V. ursinii using liquid chromatography. Disintegrins prevented adhesion of MCF7 cells to fibronectin, which indicates their interaction with integrin receptors of the V1 type. According to mass spectrometry data, the molar masses of disintegrins are about 14 kDa.