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The influence of the 13-methyl group of the retinal on the photoreaction of rhodopsin revealed by FTIR difference spectroscopy

✍ Scribed by U. M. Ganter; W. Gärtner; F. Siebert

Publisher
Springer
Year
1990
Tongue
English
Weight
522 KB
Volume
18
Category
Article
ISSN
1432-1017

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✦ Synopsis

The photoreaction of rhodopsin regenerated with l l-cis-13-demethyl-retinal was investigated by FTIR difference spectroscopy. The measurements show that the chromophore experiences different twists in the modified bathorhodopsin as compared to normal bathorhodopsin and that the twists are relaxed .in the additional intermediate batho-lumirhodopsin. Whereas the missing methyl group influences the lumimetarhodopsin-I transition, a metarhodopsin-I-metarhodopsin-II difference spectrum very similar to that of unmodified rhodopsin is observed. The significance of the steric interaction for regulating the photoreaction is discussed.

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