Abstract
Cyanobacteria, a group of diverse bacteria capable of oxygenic photosynthesis, are excellent models for investigating many important cellular processes, such as photosynthesis, nitrogen fixation, and prokaryotic cell differentiation. They also have great potential to become the next-generation cell factories for sustainable biosynthesis of valuable products. However, genetic manipulation in cyanobacteria is not as convenient as in other model bacteria. Particularly, handling essential genes in cyanobacteria has been difficult due to the lack of appropriate tools, limiting our understanding of many important cellular functions encoded by them. We recently develop a CRISPR-based method for constructing the conditional mutants of cyanobacterial essential genes by engineering the ribosome binding site to a theophylline-responsive riboswitch. Here, we provide the details of this method. The principle of this method could be used to construct conditional mutants in a wide range of bacterial species.
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