Bacterial alginate regulators and phage homologs repress CRISPR-Cas immunity.

ABSTRACT: CRISPR-Cas systems are adaptive immune systems that protect bacteria from bacteriophage (phage) infection¹. To provide immunity, RNA-guided protein surveillance complexes recognize foreign nucleic acids, triggering their destruction by Cas nucleases². While the essential requirements for immune activity are well understood, the physiological cues that regulate CRISPR-Cas expression are not. Here, a forward genetic screen identifies a two-component system (KinB-AlgB), previously characterized in the regulation of Pseudomonas aeruginosa alginate biosynthesis^3,4, as a regulator of the expression and activity of the P. aeruginosa Type I-F CRISPR-Cas system. Downstream of KinB-AlgB, activators of alginate production AlgU (a σ^E orthologue) and AlgR rep

SUBMITTER: Borges AL 

PROVIDER: S-EPMC7190418 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature