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Biophysical Journal 54: 527-533 (1988)
© 1988 the Biophysical Society

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TI-205 nuclear magnetic resonance determination of the thermodynamic parameters for the binding of monovalent cations to gramicidins A and C.

J F Hinton, J Q Fernandez, D C Shungu, W L Whaley, R E Koeppe, 2nd and F S Millett

Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville 72701.

ABSTRACT

Thermodynamic parameters for the binding of the monovalent cations, Li+, Na+, K+, Rb+, Cs+, NH4+, TI+, and Ag+, to gramicidin A and for the binding of TI+ to gramicidin C, incorporated into lysophosphatidylcholine, have been determined using a combination of TI-205 nuclear magnetic resonance spectroscopy and competition binding. The thermodynamic parameters, enthalpy and entropy, are discussed in terms of a process involving the transfer of cations from an aqueous to amide environment.






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Copyright © 1988 by the Biophysical Society.