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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Structural models of the photointermediates in the rhodopsin photocascade, lumirhodopsin, metarhodopsin I, and metarhodopsin II.

Model building of the two photointermediates, lumirhodopsin and metarhodopsin I, and the activated form of rhodopsin, metarhodopsin II, is described. An outward swing of the C-terminal portion of transmembrane segment 3, pivoting on Cys110 at the N-terminal end of transmembrane segment 3, led to structural models of lumirhodopsin and metarhodopsin I. The conformation of the chromophore in the lumirhodopsin and metarhodopsin I models is controlled by the motion of transmembrane segment 3 and agreed closely with the hydrogen-bonding states of the protonated Schiff base in lumirhodopsin and metarhodopsin I as deduced from their FTIR and resonance Raman spectra and with the negative and positive CD bands of lumirhodopsin and metarhodopsin I, respectively. The structure of metarhodopsin II was constructed by an outward swing of transmembrane segment 3 and the rigid-body motion of transmembrane segment 6. The arrangement of the entire transmembrane segment of the metarhodopsin II model closely agreed with the electron paramagnetic resonance spectra of spin-labeled rhodopsin mutants and provided a structural basis for the protonation of Glu134, which is a key process in transducin activation.[1]


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