Ultrafast infrared spectroscopy reveals a key step for successful entry into the photocycle for photoactive yellow protein.

@article{Wilderen2006UltrafastIS,
  title={Ultrafast infrared spectroscopy reveals a key step for successful entry into the photocycle for photoactive yellow protein.},
  author={Luuk J G W van Wilderen and Michael A van der Horst and Ivo H M Stokkum and Klaas Jan Hellingwerf and Rienk van Grondelle and Marie Louise Groot},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2006},
  volume={103 41},
  pages={
          15050-5
        }
}
Photoactive proteins such as PYP (photoactive yellow protein) are generally accepted as model systems for studying protein signal state formation. PYP is a blue-light sensor from the bacterium Halorhodospira halophila. The formation of PYP's signaling state is initiated by trans-cis isomerization of the p-coumaric acid chromophore upon the absorption of light. The quantum yield of signaling state formation is approximately 0.3. Using femtosecond visible pump/mid-IR probe spectroscopy, we… CONTINUE READING

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