[1] St Petersburg State Polytech Univ, Dept Biophys, St Petersburg, Russia
[2] UCL, Inst Struct & Mol Biol, Div Biosci, London, England
[3] St Petersburg State Polytech Univ, Inst Nanobiotechnol, St Petersburg, Russia
[4] UCL, Dept Chem, London, England
[5] LBME, CNRS, UMR 5099, Toulouse, France