Browsing by Subject "Gating"

Now showing 1 - 1 of 1
  • Thumbnail Image
    Publication
    Open Access
    Competing lipid-protein and protein-protein interactions determine clustering and gating patterns in KcsA
    (American Society for Biochemistry and Molecular Biology, 2015-09-02) Molina Gallego, María Luisa; Giudici Besseghini, Ana Marcela; Poveda Larrosa, José Antonio; Fernández Ballester, Gregorio; Montoya Díaz, Estefanía; Renart Pérez, María Lourdes; Fernández Carvajal, Asia María; Encinar Hidalgo, José Antonio; Riquelme Pino, Gloria; Morales Calderón, Andrés; González Ros, José Manuel; Bioquímica y Biología Molecular B e Inmunología
    There is increasing evidence to support the notion that membrane proteins, instead of being isolated components floating in a fluid lipid environment, can be assembled into supramolecular complexes that take part in a variety of cooperative cellular functions. The interplay between lipid-protein and protein-protein interactions is expected to be a determinant factor in the assembly and dynamics of such membrane complexes. Here we report on a role of anionic phospholipids in determining the extent of clustering of KcsA, a model potassium channel. Assembly/disassembly of channel clusters occurs, at least partly, as a consequence of competing lipid-protein and protein-protein interactions at nonannular lipid binding sites on the channel surface and brings about profound changes in the gating properties of the channel. Our results suggest that these latter effects of anionic lipids are mediated via the Trp67–Glu71–Asp80 inactivation triad within the channel structure and its bearing on the selectivity filter.