文章基本信息

标题：Blue-/Green-Light-Responsive Cyanobacteriochromes Are Cell Shade Sensors in Red-Light Replete Niches
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作者：Gen Enomoto ; Masahiko Ikeuchi
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2020
卷号：23
期号：3
页码：1-15
DOI：10.1016/j.isci.2020.100936
语种：English
出版社：Elsevier
摘要：SummaryCyanobacteriochrome (CBCRs) photoreceptors show various photochemical properties, but their ecophysiological functions remain elusive. Here, we report that the blue/green CBCRs SesA/B/C can serve as physiological sensors of cell density. Because cyanobacterial cells show lower transmittance of blue light than green light, higher cell density gives more green-light-enriched irradiance to cells. The cell-density-dependent suppression of cell aggregation under blue-/green-mixed light and white light conditions support this idea. Such a sensing mechanism may provide information about the cell position in cyanobacterial mats in hot springs, the natural habitat ofThermosynechococcus. This cell-position-dependent SesA/B/C-mediated regulation of cellular sessility (aggregation) might be ecophysiologically essential for the reorganization and growth of phototrophic mats. We also report that the green-light-induced dispersion of cell aggregates requires red-light-driven photosynthesis. Blue/green CBCRs might work as shade detectors in a different niche than red/far-red phytochromes, which may be why CBCRs have evolved in cyanobacteria.Graphical AbstractDisplay OmittedHighlights•Blue- and green-light-sensing cyanobacteriochromes can be sensors of cell density•They may provide information about the cell position in microbial mats•Green-light-induced dispersion of aggregates needs red-light-driven photosynthesis•Cyanobacteriochromes might work in a different niche than red/far-red phytochromesSensor; Biological Sciences; Microbiology