Download MendeleyHigh-Performance Chemigenetic Potassium Ion Indicator.
Cheng, D., Ouyang, Z., He, X., Nasu, Y., Wen, Y., Terai, T., Campbell, R.E.(2024) J Am Chem Soc 146: 35117-35128
- PubMed: 39601449
- DOI: https://doi.org/10.1021/jacs.4c10917
- Primary Citation of Related Structures:
8ZEX - PubMed Abstract:
Potassium ion (K + ) is the most abundant metal ion in cells and plays an indispensable role in practically all biological systems. Although there have been reports of both synthetic and genetically encoded fluorescent K + indicators, there remains a need for an indicator that is genetically targetable, has high specificity for K + versus Na + , and has a high fluorescent response in the red to far-red wavelength range. Here, we introduce a series of chemigenetic K + indicators, designated as the HaloKbp1 series, based on the bacterial K + -binding protein (Kbp) inserted into HaloTag7 self-labeled with environmentally sensitive rhodamine derivatives. This series of high-performance indicators features high brightness in the red to far-red region, large intensiometric fluorescence changes, and a range of K d values. We demonstrate that they are suitable for the detection of physiologically relevant K + concentration changes such as those that result from the Ca 2+ -dependent activation of the BK potassium channel.
Organizational Affiliation:
Department of Chemistry, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
