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The Expanded Red/Green Cyanobacteriochrome Lineage: An Evolutionary Hot Spot.
Photochemistry and Photobiology 2017 May
This article highlights the paper by Rockwell et al. in the current issue of Photochemistry and Photobiology. Rockwell et al. describe the discovery of novel two-Cys photocycles within the "expanded red/green" (XRG) cyanobacteriochrome (CBCR) lineage. Comprehensive phylogenetic analysis revealed that several XRG CBCRs possess a second Cys residue in the DXCF (Asp-Xaa-Cys-Phe) motif conserved among the DXCF CBCR lineage. Spectral studies identified that these CBCRs showed green/blue or ultraviolet/blue reversible photoconversion abilities. The green/blue reversible photocycle had not been reported previously among the XRG CBCR lineage. Based on these findings, Rockwell et al. replaced three amino acid residues in a red/green reversible CBCR, NpR6012g4, and succeeded in constructing a violet/green reversible photocycle. These findings, together with previous studies, provide a good explanation for the evolutionary flexibility of the XRG CBCRs.
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