... Science, Shizuoka University, Japan2 Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Kagawa, Japan3 Division of Gene Structure and Function, Saitama Medical University Research ... protein as a G-quadruplex DNA- and RNA-binding proteinKentaro Takahama1,*, Katsuhito Kino2,*, Shigeki Arai3, Riki Kurokawa3 and Takanori Oyoshi11 Department of Chemistry, Faculty of Science, ... for binding to nucleicacids, was expressed in Escherichia coli as proteinsfused to glutathione S- transferase (GST) and purifiedusing glutathione agarose.32P-labeled ETS-1 was firstincubated...