Integrated analysis of cyanobacteriochromes in diversity and molecular regulation of cyanobacterial photoresponses

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We found that cyanobacteria possess diverse photoreceptors and cyanobacteriochromes are unique in perception of wide range of light color. We focused on biochemical, structural and physiological aspects of cyanobacteriochromes in order to integrate the light signaling system at molecular level. We determined the crystal structures of two cyanobacteriochromes and revealed the atomic basis for the color tuning and intramolecular signaling. We determined enzymatic regulation of the cyanobacteriochromes to produce or degrade a second messenger molecule, cyclic diguanylic acid, which induces cellulose production and cellular aggregation in thermophilic cyanobacteria. We also elucidated the molecular contribution of the cyanobacteriochromes to the cellular aggregation by combinatorial mutagenesis studies. Thus, a set of cyanobacteriochromes integrates various light signals into the cellulose production and cellular aggregation by direct regulation of cyclic diguanylic acid.