Structural and Functional Studies on Photoactive Retinal Proteins: Light Becomes Drugs with Proteins

Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan
Yuki Sudo

Abstract

Retinal proteins possess vitamin A aldehyde (retinal) as a chromophore within seven transmembrane α-helices. Visible light absorption of them triggers trans-cis photoisomerization of the retinal chromophore and induces structural changes in the protein moiety, resulting in a variety of biological functions such as vision, ion transportation, and photosensing. Environmental genomics revealed that retinal proteins are widely distributed through all three biological kingdoms, eukarya, bacteria, and archaea, indicating the biological significance of their light energy conversion. In addition to their biological aspect, retinal proteins have become a focus of interest in part because of applications for optogenetics. On the basis of our results and other findings, we highlight the recent progress in structural and functional studies on retinal proteins.

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