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Significance Cyanobacteria have sophisticated photosensory systems to adapt to ambient-light conditions to improve oxygenic photosynthesis efficiency. Their genomes contain many genes encoding cyanobacteriochromes (CBCRs), which are the photoreceptors of light-signaling pathways. Although the photochemical properties of many CBCRs have been characterized, whether and how multiple photoreceptors work together are unknown. Herein we describe how three CBCRs work together in a light color-sensitive manner to regulate cyanobacterial cell aggregation. The three CBCRs have distinguishable, but congruent, light color-dependent c-di-GMP synthetic and/or degrading activities. Ours is the first report, to our knowledge, concerning synchronization of distinctive CBCR activities, which emphasizes the underlying need for CBCR photoreceptors with diverse activities.

Three cyanobacteriochromes work together to form a light color-sensitive input system for c-di-GMP signaling of cell aggregation