Background:HemAT is an O 2 sensor and functions as a signal transducer for aerotaxis. Results: The UV resonance Raman spectra indicated two phases of intensity changes for the Trp, Tyr, and Phe bands of proteins. Conclusion: Changes in the heme structure drive displacements of the B-and G-helices upon CO photolysis. Significance: Understanding the communication pathway from the sensor to signaling domain of HemAT-Bs.
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