CRISPR-Cas12a-based genome editing and transcriptional repression for biotin synthesis in
Pseudomonas mutabilis.
J Appl Microbiol 2023;
134:7076876. [PMID:
36914213 DOI:
10.1093/jambio/lxad049]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 10/31/2022] [Accepted: 03/11/2023] [Indexed: 03/16/2023]
Abstract
AIMS
To establish a dual-function clustered regularly interspaced short palindromic repeats (CRISPR)-Cas12a system combined genome editing and transcriptional repression for multiplex metabolic engineering of Pseudomonas mutabilis.
MATERIALS AND RESULTS
This CRISPR-Cas12a system consisted of two plasmids that enabled single gene deletion, replacement, and inactivation with efficiency >90% for most targets within 5 days. With the guidance of truncated crRNA containing 16 bp spacer sequences, a catalytically active Cas12a could be employed to repress the expression of the reporter gene eGFP up to 66.6%. When bdhA deletion and eGFP repression were tested simultaneously by transforming a single crRNA plasmid and Cas12a plasmid, the knockout efficiency reached 77.8% and the expression of eGFP was decreased by >50%. Finally, the dual-functional system was demonstrated to increase the production of biotin by 3.84-fold, with yigM deletion and birA repression achieved simultaneously.
CONCLUSIONS
This CRISPR-Cas12a system is an efficient genome editing and regulation tool to facilitate the construction of P. mutabilis cell factories.
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