It is an analogous process of interference by RNAi from eukaryotes. You can activate this process with dsRNA, analogous to the sequence target for silencing . You need deliver a syntetic dsRNA or an expresing system for that.
You can look in the following works:
Nat Rev Genet. 2010 March; 11(3): 181–190. doi: 10.1038/nrg2749 PMCID: PMC2928866 NIHMSID: NIHMS195083 CRISPR interference: RNA-directed adaptive immunity in bacteria and archaea Luciano A. Marraffini and Erik J. Sontheimer.
Functional Genomics. Methods in Molecular Biology Volume 815, 2012, pp 307-319. Multiple-Gene Silencing Using Antisense RNAs in Eschechia coli N Nakashima, S Goh, L Good, Tomohiro Tamura