藻胆体
亮度
光合作用
化学
消散
蓝光
光化学
生物物理学
蓝藻
纳米技术
化学物理
光学
材料科学
光电子学
物理
生物
热力学
生物化学
遗传学
细菌
作者
Michal Gwizdala,Joshua L. Botha,Adjélé Wilson,Diana Kirilovsky,Rienk van Grondelle,Tjaart P. J. Krüger
标识
DOI:10.1021/acs.jpclett.8b00767
摘要
Photosynthetic organisms have found various smart ways to cope with unexpected changes in light conditions. In many cyanobacteria, the lethal effects of a sudden increase in light intensity are mitigated mainly by the interaction between phycobilisomes (PBs) and the orange carotenoid protein (OCP). The latter senses high light intensities by means of photoactivation and triggers thermal energy dissipation from the PBs. Due to the brightness of their emission, PBs can be characterized at the level of individual complexes. Here, energy dissipation from individual PBs was reversibly switched on and off using only light and OCP. We reveal the presence of quasistable intermediate states during the binding and unbinding of OCP to PB, with a spectroscopic signature indicative of transient decoupling of some of the PB rods during docking of OCP. Real-time control of emission from individual PBs has the potential to contribute to the development of new super-resolution imaging techniques.
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