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- W2061086369 abstract "Proline residues are commonly found in putative transbilayer helices of many integral membrane proteins which act as transporters, channels and receptors. Intramembranous prolines are often conserved between homologous proteins. It has been suggested that such intrahelical prolines provide liganding sites for cations via exposure of the backbone carbonyl oxygen atoms of residues i-3 and i-4 (relative to the proline). Molecular modelling studies have been carried out to evaluate this proposal. Bundles of parallel proline-kinked helices are considered as simplified models of ion channels. The energetics of K+ ion-helix bundle interactions are explored. It is shown that carbonyl oxygens exposed by the proline-induced kink and at the C-terminus of the helices may provide cation-liganding sites. ‘Hybrid’ bundles of antiparallel helices, only some of which contain proline residues, are considered as models of transport proteins. Again, praline-exposed carbonyi oxygens are shown to be capable of liganding cations. The roles of α-helix dipoles and of the geometry of helix packing are considered in relation to cation-bundle interactions. Implications with respect to modelling of ion channel and transport proteins are discussed" @default.
- W2061086369 created "2016-06-24" @default.
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- W2061086369 date "1992-01-01" @default.
- W2061086369 modified "2023-09-26" @default.
- W2061086369 title "Proline residues in transmembrane helices of channel and transport proteins: a molecular modelling study" @default.
- W2061086369 doi "https://doi.org/10.1093/protein/5.1.53" @default.
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