1 Supplementary Information Metal-Ion Responsive Reversible Assembly of DNA Origami Dimers: G-Quadruplex Induced Intermolecular Interaction Shuo Yang, a Wenyan Liu, b Rachel Nixon, a and Risheng Wang * a a Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409, United States b Center for Research in Energy and Environment, Missouri University of Science and Technology, Rolla, MO 65409, United States * E-mail: wangri@mst.edu Electronic Supplementary Material (ESI) for Nanoscale. This journal is © The Royal Society of Chemistry 2018