1. A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow 119899, Russia, Laboratory for Optical Biosciences, INSERM U451, CNRS UMR 7645, Ecole Polytechnique-ENSTA, 91128 Palaiseau Cedex, France, Institut de Biologie Physico-Chimique, CNRS UPR 1261, 13 rue Pierre et Marie Curie, 75005 Paris, France, and Department of Biochemistry, University of Illinois at Urbana−Champaign, 600 South Mathews Street, Urbana, Illinois 60801