1 H-NMR study of gramicidin A transmembrane ion channel
نویسندگان
چکیده
منابع مشابه
Interaction of K+ ion with the solvated gramicidin A transmembrane channel.
Using Urry's gramicidin A (GA) atomic coordinates and ab into calculations, the interaction energies of a K+ ion with GA are examined. From these energies the values of the fitting parameters are obtained for 6-12-1 atom-atom pair potentials. The potential of the GA channel as experienced by the ion is analyzed in detail. An energy profile of the K+ ion in the GA channel is obtained by analyzin...
متن کاملAn asymmetric ion channel derived from gramicidin A. Synthesis, function and NMR structure.
The biological ion channel gramicidin A (gA) was modified by synthetic means to obtain the tail-to-tail linked asymmetric gA-derived dimer compound 3. Single-channel current measurements for 3 in planar lipid bilayers exhibit an Eisenman I ion selectivity for alkali cations. The structural asymmetry does not lead to an observable functional asymmetry. The structure of 3 in solution without and ...
متن کاملThe gramicidin ion channel: a model membrane protein.
The linear peptide gramicidin forms prototypical ion channels specific for monovalent cations and has been extensively used to study the organization, dynamics and function of membrane-spanning channels. In recent times, the availability of crystal structures of complex ion channels has challenged the role of gramicidin as a model membrane protein and ion channel. This review focuses on the sui...
متن کاملDensity-functional theory study of gramicidin A ion channel geometry and electronic properties.
Understanding the mechanisms underlying ion channel function from the atomic-scale requires accurate ab initio modelling as well as careful experiments. Here, we present a density functional theory (DFT) study of the ion channel gramicidin A (gA), whose inner pore conducts only monovalent cations and whose conductance has been shown to depend on the side chains of the amino acids in the channel...
متن کاملThe gramicidin A transmembrane channel: a proposed pi(L,D) helix.
A lipophilic, left-handed helical structure is proposed for gramicidin A in which the C-O bonds alternately point toward the amino and carboxyl ends; it is a hybrid of the 4.3(14) and 4.4(16) helices. The C-O groups pointing toward the carboxyl end form part of 16-membered hydrogen-bonded rings, whereas the C-O moieties pointing toward the amino end form 14-membered hydrogenbonded rings. The pr...
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ژورنال
عنوان ژورنال: FEBS Letters
سال: 1985
ISSN: 0014-5793
DOI: 10.1016/0014-5793(85)80702-x