[1] Univ Salzburg, Dept Mol Biol, Billrothstr 11, A-5020 Salzburg, Austria
[2] FLI, Leibniz Inst Aging, Prot Crystallog Grp, Beutenbergstr 11, D-07745 Jena, Germany
[3] Philipps Univ Marburg, Dept Pharmaceut Chem, Marbacher Weg 6, D-35032 Marburg, Germany