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Ye S, Enghiad B, Zhao H, Takano E. Fine-tuning the regulation of Cas9 expression levels for efficient CRISPR-Cas9 mediated recombination in Streptomyces. J Ind Microbiol Biotechnol 2020; 47:413-423. [PMID: 32367443 PMCID: PMC7244461 DOI: 10.1007/s10295-020-02277-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 04/23/2020] [Indexed: 12/12/2022]
Abstract
CRISPR-Cas9 has proven as a very powerful gene editing tool for Actinomyces, allowing scarless and precise genome editing in selected strains of these biotechnologically relevant microorganisms. However, its general application in actinomycetes has been limited due to its inefficacy when applying the system in an untested strain. Here, we provide evidence of how Cas9 levels are toxic for the model actinomycetes Streptomyces coelicolor M145 and Streptomyces lividans TK24, which show delayed or absence of growth. We overcame this toxicity by lowering Cas9 levels and have generated a set of plasmids in which Cas9 expression is either controlled by theophylline-inducible or constitutive promoters. We validated the targeting of these CRISPR-Cas9 system using the glycerol uptake operon and the actinorhodin biosynthesis gene cluster. Our results highlight the importance of adjusting Cas9 expression levels specifically in strains to gain optimum and efficient gene editing in Actinomyces.
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Affiliation(s)
- Suhui Ye
- Department of Chemistry, School of Natural Sciences, Faculty of Science and Engineering, Manchester Centre for Synthetic Biology of Fine and Speciality Chemicals (SYNBIOCHEM), Manchester Institute of Biotechnology, University of Manchester, 131 Princess Street, Manchester, M1 7DN, UK.,Research Group BIONUC (Biotechnology of Nutraceuticals and Bioactive Compounds), Departamento de Biología Funcional, Área de Microbiología, IUOPA (Instituto Universitario de Oncología del Principado de Asturias), ISPA (Instituto de Investigación Sanitaria del Principado de Asturias), Universidad de Oviedo, Avenida Julián Clavería S/N, 33006, Oviedo, Principality of Asturias, Spain
| | - Behnam Enghiad
- Department of Chemical and Biomolecular Engineering, and Carl R. Woese Institute for Genomic Biology, University of Illinois At Urbana-Champaign, Urbana, IL, 61801, USA
| | - Huimin Zhao
- Department of Chemical and Biomolecular Engineering, and Carl R. Woese Institute for Genomic Biology, University of Illinois At Urbana-Champaign, Urbana, IL, 61801, USA
| | - Eriko Takano
- Department of Chemistry, School of Natural Sciences, Faculty of Science and Engineering, Manchester Centre for Synthetic Biology of Fine and Speciality Chemicals (SYNBIOCHEM), Manchester Institute of Biotechnology, University of Manchester, 131 Princess Street, Manchester, M1 7DN, UK.
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