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• W2008431526 abstract "Abstract Cesium ion interaction with the Gramicidin transmembrane channel is studied using cesium-133 NMR. The channel system provides unusual insight into the use of spin - 7 2 nuclei to obtain ion interaction information. In spite of the small quadrupole moment for 133Cs, the absolute magnitude of which is 1 40 that of 23Na, the change in longitudinal relaxation rate for 133Cs interaction with channels is twice that observed for 23Na under identical conditions. Also, only small positive ion resonance chemical shifts are experimentally observed which are of opposite sign to those observed for the other alkali metal ions. The possibility of the cesium ion pairing with chloride ion in the channel binding site is explored as explanation for the small positive chemical shift and large T1 changes. The large T1 changes provide values for both tight and weak binding constants, i.e., Kbt ≈ 60/M and Kbw ≈ 4/M. In the null region of the partially relaxed spectra two narrow lines (separated by 20 Hz at 13 MHz) and a broad line were observed and the longitudinal relaxation rates were faster for the narrow components than for the broad component. Evidence is presented indicating that all resolvable lines were derived from a single equilibrated pool of spin - 7 2 nuclei. The null region demonstrates that a single, intense, narrow resonance line dominates the longitudinal relaxation in accordance with the analyses of Bull, Forsen, and Turner." @default.
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• W2008431526 date "1985-10-01" @default.
• W2008431526 modified "2023-10-01" @default.
• W2008431526 title "Cesium-133 NMR longitudinal relaxation study of ion binding to the Gramicidin transmembrane channel" @default.
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• W2008431526 doi "https://doi.org/10.1016/0022-2364(85)90374-9" @default.
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