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  Direct detection of bound ammonium ions in the selectivity filter of ion channels by solid-state NMR.

Öster, C., Tekwani Movellan, K., Goold, B., Hendriks, K., Lange, S., Becker, S., et al. (2022). Direct detection of bound ammonium ions in the selectivity filter of ion channels by solid-state NMR. Journal of the American Chemical Society, 144(9), 4147-4157. doi:10.1021/jacs.1c13247.

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Öster, C., Author
Tekwani Movellan, K.1, Author           
Goold, B., Author
Hendriks, K., Author
Lange, S., Author
Becker, S.1, Author           
de Groot, B. L.2, Author           
Kopec, W.2, Author           
Andreas, L. B.1, Author           
Lange, A., Author
Affiliations:
1Department of NMR Based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Max Planck Society, ou_3350124              
2Research Group of Computational Biomolecular Dynamics, MPI for biophysical chemistry, Max Planck Society, ou_578573              

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 Abstract: The flow of ions across cell membranes facilitated by ion channels is an important function for all living cells. Despite the huge amount of structural data provided by crystallography, elucidating the exact interactions between the selectivity filter atoms and bound ions is challenging. Here, we detect bound 15 N-labeled ammonium ions as a mimic for potassium ions in ion channels using solid-state NMR under near-native conditions. The non-selective ion channel NaK showed two ammonium peaks corresponding to its two ion binding sites, while its potassium-selective mutant NaK2K that has a signature potassium- selective selectivity filter with four ion binding sites gave rise to four ammonium peaks. Ions bound in specific ion binding sites were identified based on magnetization transfer between the ions and carbon atoms in the selectivity filters. Magnetization transfer between bound ions and water molecules revealed that only one out of four ions in the selectivity filter of NaK2K is in close contact with water, which is in agreement with the direct knock-on ion conduction mechanism where ions are conducted through the channel by means of direct interactions without water molecules in between. Interestingly, the potassium-selective ion channels investigated here (NaK2K and, additionally, KcsA-Kv1.3) showed remarkably different chemical shifts for their bound ions, despite having identical amino acid sequences and crystal structures of their selectivity filters. Molecular dynamics simulations show similar ion binding and conduction behavior between ammonium and potassium ions and identify the origin of the differences between the investigated potassium channels

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Language(s): eng - English
 Dates: 2021-12-202022-02-242022-03-09
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jacs.1c13247
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Project name : Germany’s Excellence Strategy - EXC 2008 - 390540038 - UniSysCat. C.Ö. acknowledges funding from the Human Frontier Science Program LT000303-2019-L
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Funding organization : DFG, German Research Foundation

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Title: Journal of the American Chemical Society
Source Genre: Journal
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Pages: - Volume / Issue: 144 (9) Sequence Number: - Start / End Page: 4147 - 4157 Identifier: -