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. 2018 Mar 26;115(15):3822–3827. doi: 10.1073/pnas.1719376115

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Fig. 1. — Electron conduit for photoreduction of dCRY. The Trp-tetrad (W420, W397F, W342, and W394; blue) reductively quenches the FAD-excited state (yellow flavin) of dCRY (Protein Data Bank ID code 4GU5). The displaceable CTT (red) associates closely with the protein core via the Phe-Phe-Trp (FFW) motif (purple). Photoexcited FAD oxidizes the most proximal Trp residue (in picoseconds), and the electron hole then propagates to a surface residue that can be reduced by external reductants. e⁻, electron; hv, photon.