Color Sensing and Signal Transmission Diversity of Cyanobacterial Phytochromes and Cyanobacteriochromes
Yvette Villafani , Hee Wook Yang , and Youn-Il Park *
Department of Biological Sciences, Chungnam National University, Daejeon 34134, Korea
Received March 24, 2020; Revised April 28, 2020; Accepted April 28, 2020.; Published online May 22, 2020.
© Korean Society for Molecular and Cellular Biology. All rights reserved.

ABSTRACT
To perceive fluctuations in light quality, quantity, and timing, higher plants have evolved diverse photoreceptors including UVR8 (a UV-B photoreceptor), cryptochromes, phototropins, and phytochromes (Phys). In contrast to plants, prokaryotic oxygen-evolving photosynthetic organisms, cyanobacteria, rely mostly on bilin-based photoreceptors, namely, cyanobacterial phytochromes (Cphs) and cyanobacteriochromes (CBCRs), which exhibit structural and functional differences compared with plant Phys. CBCRs comprise varying numbers of light sensing domains with diverse color-tuning mechanisms and signal transmission pathways, allowing cyanobacteria to respond to UV-A, visible, and far-red lights. Recent genomic surveys of filamentous cyanobacteria revealed novel CBCRs with broader chromophore-binding specificity and photocycle protochromicity. Furthermore, a novel Cph lineage has been identified that absorbs blue-violet/yellow-orange light. In this minireview, we briefly discuss the diversity in color sensing and signal transmission mechanisms of Cphs and CBCRs, along with their potential utility in the field of optogenetics.
Keywords: color sensing, cyanobacteria, cyanobacterial phytochromes, cyanobacteriochromes, signal transmission


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31 May 2020 Volume 43,
Number 5, pp. 419~499

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