Cross-phosphorylation of RR06 by the non-cognate kinase VncS activates the adhesin CbpA in Streptococcus pneumoniae.
This study reveals that in *Streptococcus pneumoniae*, the non-cognate sensor kinase VncS promotes host cell adhesion by cross-phosphorylating and activating the response regulator RR06 to upregulate the adhesin CbpA, a process normally restrained by the cognate kinase HK06 acting as a phosphatase.