1. Department of Physics, Concordia University, Montreal QC H4B 1R6, Canada
2. Centre for Research in Molecular Modeling, Concordia University, Montreal, Quebec H4B 1R6, Canada
3. Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada
4. Department of Chemistry and Center for Computational and Integrative Biology, Rutgers University, Camden, New Jersey 08102, United States