A large geometric distortion in the first photointermediate of rhodopsin, determined by double-quantum solid-state NMR
作者： Maria Concistrè , Ole G. Johannessen , Neville McLean , Petra H. M. Bovee-Geurts , Richard C. D. Brown
DOI: 10.1007/S10858-012-9635-4
关键词: Magic angle spinning 、 Photoisomerization 、 Rhodopsin 、 Chemistry 、 Moiety 、 Raman spectroscopy 、 Solid-state nuclear magnetic resonance 、 Twist 、 Isomerization 、 Molecular physics 、 Crystallography
摘要: Double-quantum magic-angle-spinning NMR experiments were performed on 11,12-13C2-retinylidene-rhodopsin under illumination at low temperature, in order to characterize torsional angle changes the C11-C12 photoisomerization site. The sample was illuminated rotor temperature (~120 K) trap primary photointermediate, bathorhodopsin. data are consistent with a strong twist of HCCH moiety isomerization Although determined be least 40°, it not possible quantify more closely. presence is agreement previous Raman observations. energetic implications this geometric distortion discussed.
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