Light-Sensitive Enzymes Reveal How Bacteria Process Signals

Researchers at the University of Bayreuth and Forschungszentrum Jülich demonstrated that light-sensitive bacterial enzymes transmit signals by changing their asymmetry ^[1].

This discovery provides a fundamental understanding of how bacteria process environmental signals. By uncovering the mechanical shift in these enzymes, scientists may develop more precise tools for biomedicine and biotechnology ^[1].

The study, reported in Science Advances this month, focuses on specific enzymes known as sensor histidine kinases (SHKs) ^[1]. These proteins act as the primary sensors for bacteria, allowing them to detect and respond to changes in their surroundings.

Researchers said these SHKs transmit their signal through a light-controlled change in asymmetry ^[1]. The process involves the enzyme flipping between two distinct shapes, which effectively triggers the signal to travel through the bacterial cell ^[1].

"Researchers at the University of Bayreuth and Forschungszentrum Jülich have demonstrated that specific light-sensitive enzymes—so-called sensor histidine kinases (SHKs)—transmit their signal through a light-controlled change in asymmetry," a researcher said ^[1].

The ability to manipulate these shapes using light allows scientists to observe the signal transmission in real time. This level of control helps the team map the exact pathway signals take within the organism ^[1].

The findings suggest that the structural flip is a central mechanism for signal processing in bacteria. Understanding this movement could lead to the engineering of synthetic biological systems that respond to specific light frequencies ^[1].