Abstract
Fluorescence recovery after photobleaching (FRAP) has been used to study the dynamics of the cyanobacterial photosynthesis apparatus since 1997. Fluorescence recovery of cyanobacteria during FRAP was conventionally interpreted as a result of phycobilisome (PBS) diffusion on the surface of the thylakoid membrane. The mechanism of state transition in cyanobacteria has been widely attributed to PBS diffusion. However, in red algae, another PBS-containing group, the intrinsic photoprocess was found to contribute greatly to the fluorescence recovery of PBS, which raises questions concerning the role of FRAP in red algal PBS. Therefore, it is important to re-evaluate the nature of PBS fluorescence recovery in cyanobacteria. In the present study, four cyanobacterial strains with different phenotypes and PBS compositions were used to investigate their FRAP characteristics. Fluorescence recovery of PBS was observed in wholly photobleached cells in all four cyanobacterial strains, in which the contribution of PBS diffusion to the fluorescence recovery was not possible. Moreover, the fluorescence recovered in isolated PBSs and PBS-thylakoid membranes after photobleaching further demonstrated the intrinsic photoprocess nature of fluorescence recovery. These findings suggest that the intrinsic photoprocess contributed to the fluorescence recovery following photobleaching when measured by the FRAP method.
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25 June 2021
A Correction to this paper has been published: https://doi.org/10.1007/s42995-021-00111-0
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Acknowledgements
We thank Haiyan Yu and Xiaomin Zhao from Core Facilities for Life and Environmental Sciences of Shandong University for technical help. This work was supported by the National Natural Science Foundation of China (no. 31900023), National Key R&D Program of China (no. 2018YFC1406701), Program of Shandong Taishan Scholars (no. tspd20181203), Natural Science Foundation of Shandong (no. ZR2017LD013), AoShan Talents Cultivation Program (no. 2017ASTCP-OS14), State Key Laboratory of Microbial Technology Open Projects Fund (no. M2019-07), and Young Scholars Program of Shandong University (no. 2017WLJH22).
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YZZ and HNS conceived this work; NZ, HNS, and KL performed experiments; HNS, BBX, XLC, and BCZ analyzed data; NZ and HNS prepared the figures and wrote the manuscript. All authors approved the final manuscript.
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Edited by Jiamei Li.
The original online version of this article was revised: A funding number was incorrect in the Acknowledgements section.
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Zhang, N., Li, K., Xie, BB. et al. Fluorescence recovery after photobleaching: analyses of cyanobacterial phycobilisomes reveal intrinsic fluorescence recovery. Mar Life Sci Technol 3, 427–433 (2021). https://doi.org/10.1007/s42995-021-00104-z
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DOI: https://doi.org/10.1007/s42995-021-00104-z