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The activation mode of the mechanosensitive ion channel, MscL, by lysophosphatidylcholine differs from tension-induced gating

Mukherjee, N., Jose, M., Birkner, J. P., Walko, M., Ingolfsson, H. I., Dimitrova, A., Arnarez, C., Marrink, S. J. & Kocer, A., Oct-2014, In : The FASEB Journal. 28, 10, p. 4292-4302 11 p.

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  • The activation mode of the mechanosensitive ion channel, MscL

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DOI

One of the best-studied mechanosensitive channels is the mechanosensitive channel of large conductance (MscL). MscL senses tension in the membrane evoked by an osmotic down shock and directly couples it to large conformational changes leading to the opening of the channel. Spectroscopic techniques offer unique possibilities to monitor these conformational changes if it were possible to generate tension in the lipid bilayer, the native environment of MscL, during the measurements. To this end, asymmetric insertion of L-alpha-lysophosphatidylcholine (LPC) into the lipid bilayer has been effective; however, how LPC activates MscL is not fully understood. Here, the effects of LPC on tension-sensitive mutants of a bacterial MscL and on MscL homologs with different tension sensitivities are reported, leading to the conclusion that the mode of action of LPC is different from that of applied tension. Our results imply that LPC shifts the free energy of gating by interfering with MscL-membrane coupling. Furthermore, we demonstrate that the fine-tuned addition of LPC can be used for controlled activation of MscL in spectroscopic studies.

Original languageEnglish
Pages (from-to)4292-4302
Number of pages11
JournalThe FASEB Journal
Volume28
Issue number10
Publication statusPublished - Oct-2014

    Keywords

  • spectroscopy, protein-lipid interaction, mechanosensation, critical micelle concentration of LPC, COARSE-GRAINED MODEL, ESCHERICHIA-COLI, MOLECULAR-DYNAMICS, MEMBRANE-PROTEINS, MYCOBACTERIUM-TUBERCULOSIS, FUNCTIONAL RECONSTITUTION, LIPID-BILAYERS, SINGLE RESIDUE, FORCE-FIELD, SIMULATIONS

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