Engineered hypermutation adapts cyanobacterial photosynthesis to combined high light and high temperature stress

Huili Sun, Guodong Luan (), Yifan Ma, Wenjing Lou, Rongze Chen, Dandan Feng, Shanshan Zhang, Jiahui Sun and Xuefeng Lu ()
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Huili Sun: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
Guodong Luan: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
Yifan Ma: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
Wenjing Lou: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
Rongze Chen: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
Dandan Feng: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
Shanshan Zhang: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
Jiahui Sun: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
Xuefeng Lu: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-20

Abstract: Abstract Photosynthesis can be impaired by combined high light and high temperature (HLHT) stress. Obtaining HLHT tolerant photoautotrophs is laborious and time-consuming, and in most cases the underlying molecular mechanisms remain unclear. Here, we increase the mutation rates of cyanobacterium Synechococcus elongatus PCC 7942 by three orders of magnitude through combinatory perturbations of the genetic fidelity machinery and cultivation environment. Utilizing the hypermutation system, we isolate Synechococcus mutants with improved HLHT tolerance and identify genome mutations contributing to the adaptation process. A specific mutation located in the upstream non-coding region of the gene encoding a shikimate kinase results in enhanced expression of this gene. Overexpression of the shikimate kinase encoding gene in both Synechococcus and Synechocystis leads to improved HLHT tolerance. Transcriptome analysis indicates that the mutation remodels the photosynthetic chain and metabolism network in Synechococcus. Thus, mutations identified by the hypermutation system are useful for engineering cyanobacteria with improved HLHT tolerance.

Date: 2023
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DOI: 10.1038/s41467-023-36964-5

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