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Water permeation through gramicidin A: Desformylation and the double helix: A molecular dynamics study

MPG-Autoren
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de Groot,  B. L.
Research Group of Theoretical Molecular Biophysics, MPI for biophysical chemistry, Max Planck Society;

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Grubmueller,  H.
Research Group of Theoretical Molecular Biophysics, MPI for biophysical chemistry, Max Planck Society;

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Zitation

de Groot, B. L., Tieleman, D. P., Pohl, P., & Grubmueller, H. (2002). Water permeation through gramicidin A: Desformylation and the double helix: A molecular dynamics study. Biophysical Journal, 82(6), 2934-2942. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B94RW-4TX1P02-B-1&_cdi=56421&_user=38661&_pii=S0006349502756348&_origin=search&_coverDate=06%2F30%2F2002&_sk=999179993&view=c&wchp=dGLbVtz-zSkzS&md5=80466bdea99a630e2f21b96e03c52b5e&ie=/sdarticle.pdf.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0012-F3B0-2
Zusammenfassung
Multinanosecond molecular dynamics simulations of gramicidin A embedded in a dimyristoylphosphatidylcholine bilayer show a remarkable structural stability for both experimentally determined conformations: the head-to-head helical dimer and the double helix. Water permeability was found to be much higher in the double helical conformation, which is explained by lower hydrogen bond-mediated enthalpic barriers at the channel entrance and its larger pore size. Free-energy perturbation calculations show that the double helical structure is stabilized by the positive charges at the N termini introduced by the desformylation, whereas the helical dimer is destabilized. Together with the recent experimental observation that desformyl gramicidin conducts water hundredfold better than gramicidin, this suggests that desformyl gramicidin A predominantly occurs in the double helical conformation.