Abstract
Phytochrome, an important photoreceptor in green plants, contains a cofactor, phytochromobilin, which shows photo-isomerization to respond as a sensor of light. The SAC-CI method was applied to the absorption spectra of several structural isomers of phytochromobilin and successfully identified the structure of the key isomers, P r and P fr forms which have long been discussed. The P r and P fr forms of the phytochromobilin are identified to be ZZZasa and ZZEass isomers, respectively, in their protonated forms. The results also indicated that the structures of the lumi-R and meta-R a forms, the intermediates during the photochemical cycle, would be ZZEasa isomers.
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