Employing aromatic tuning to modulate output from two-component signaling circuits

Area of Science:

• Microbiology
• Molecular Biology
• Synthetic Biology

Background:

• Two-component signaling circuits (TCSs) regulate essential bacterial processes.
• Controlling TCS output independently of stimuli is crucial for synthetic microbiology.
• Aromatic residues in transmembrane helices are known modulators of TCS activity.

Purpose of the Study:

• To present a synopsis of data supporting "aromatic tuning" as a method to control TCS signal output.
• To highlight initial successes and advantages of aromatic tuning.
• To suggest the broad applicability of aromatic tuning in bacterial membrane-spanning receptors.

Main Methods:

• Aromatic tuning involves repositioning aromatic residues at the cytoplasmic end of transmembrane helices.
• The method has been applied to modulate signal output from specific receptors like Tar and EnvZ in Escherichia coli.
• Data underpinning the technique and its successes are reviewed.

Main Results:

• Aromatic tuning has been demonstrated to modulate signal output from key bacterial receptors.
• The method shows promise for stimulus-independent control of TCSs.
• Advantages over previously used methods for modulating TCS output are inherent.

Conclusions:

• Aromatic tuning is a viable strategy for controlling bacterial TCSs.
• The conserved location of aromatic residues suggests wide applicability across bacterial membrane receptors.
• This method offers a powerful tool for synthetic biology applications.