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In this study, the structural and functional properties of the Na+/Betaine symporter BetP were investigated upon K+-induced activation. BetP regulates transport activity dependent on the amount of associated anionic lipids and the cytoplasmic K+-concentration. For this purpose, FTIR spectroscopy was implemented as a non-perturbing biophysical method which shed light on how the membrane lipids contribute to the molecular mechanisms of activation and regulatory response of BetP.