Blue-/Green-Light-Responsive Cyanobacteriochromes Are Cell Shade Sensors in Red-Light Replete Niches
作者： Gen Enomoto , Masahiko Ikeuchi
DOI: 10.1016/J.ISCI.2020.100936
关键词: Chemistry 、 Photosynthesis 、 Cell aggregation 、 Phytochrome 、 Biophysics 、 Green-light 、 Niche 、 Cyanobacteria 、 Phototroph 、 Cyanobacteriochrome
摘要: Summary Cyanobacteriochrome (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 lower transmittance blue light than green light, higher density gives more green-light-enriched irradiance to cells. The cell-density-dependent suppression aggregation under blue-/green-mixed and white conditions support this idea. Such a sensing mechanism may provide information about position in mats hot springs, natural habitat Thermosynechococcus. This cell-position-dependent SesA/B/C-mediated regulation cellular sessility (aggregation) might be ecophysiologically essential for reorganization growth phototrophic mats. We also green-light-induced dispersion aggregates requires red-light-driven photosynthesis. Blue/green work shade detectors different niche red/far-red phytochromes, which why have evolved cyanobacteria.
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