Transcription factor ComR (ComR)

Transcription factor ComR is a cytoplasmic receptor and DNA-binding protein primarily found in the genus Streptococcus [1]. It serves as the master regulator of the ComRS quorum-sensing system, which controls the state of natural competence in these bacteria [2]. The protein is activated upon binding its cognate signaling pheromone, XIP (sigX-inducing peptide), which is imported into the cell after being processed from the ComS precursor [3]. Once activated, the ComR-XIP complex binds to specific promoter regions to induce the expression of the alternative sigma factor SigX [1]. SigX then coordinates the transcription of late competence genes required for the assembly of the transformasome, the machinery used for DNA uptake and integration [2]. This biological process is critical for horizontal gene transfer, enabling the rapid acquisition of antibiotic resistance genes and virulence factors [1]. Because it facilitates bacterial adaptation and the spread of resistance, ComR is considered a promising target for anti-virulence drug development [4]. Inhibiting ComR could potentially disarm pathogens by preventing them from evolving resistance or forming robust biofilms [2]. While no drugs are currently approved, research is focused on synthetic peptide analogs and small molecules that can disrupt the ComR-XIP interaction [4].

Other names

Rgg-like transcription factorCompetence regulator ComRComR proteinRgg-like protein

Activation of the ComRS quorum-sensing pathway by binding the XIP pheromone, leading to the induction of SigX-mediated competence genes.