dCas9*
Protein DomaindCas9* is a Streptococcus pyogenes dCas9 variant carrying the PAM-binding mutation R1335K, engineered to eliminate PAM recognition and reduce toxicity in bacteria. In the cited study, dCas9* was also fused to the PhlF repressor to recover targetable transcriptional repression through a combined sgRNA target site and PhlF operator requirement.