[1] Max Planck Inst Biophys Chem, Abt Zellulaire Biochem, D-37077 Gottingen, Germany
[2] Max Planck Inst Biophys Chem, AG Flussig NMR Spektroskopie, D-37077 Gottingen, Germany
[3] Max Planck Inst Biophys Chem, AG Makromol Rontgenkristallog, D-37077 Gottingen, Germany