Abstract:
:The interaction of a model Lys flanked α-helical peptides K2-X24-K2, (X = A,I,L,L+A,V) with lipid bilayers composed of dimyristoylphosphatidylcholine (DMPC) and dipalmitoylphosphatidylcholine (DPPC) both, in a gel and in a liquid-crystalline state, has been studied by molecular dynamics simulations. It has been shown that these peptides cause disordering of the lipid bilayer in the gel state but only small changes have been monitored in a liquid-crystalline state. The peptides affect ordering of the surrounding lipids depending on the helix stability which is determined by amino acid side chains - their volume, shape, etc. We have shown that the helix does not keep the linear shape in all simulations but often bends or breaks. During some simulations with a very small difference between hydrophobic length of peptide and membrane thickness the peptide exhibits negligible tilt. At the same time changes in peptide conformations during simulations resulted in appearance of superhelix.
journal_name
J Mol Modeljournal_title
Journal of molecular modelingauthors
Melicherčík M,Holúbeková A,Hianik T,Urban Jdoi
10.1007/s00894-012-1550-9subject
Has Abstractpub_date
2013-11-01 00:00:00pages
4723-30issue
11eissn
1610-2940issn
0948-5023journal_volume
19pub_type
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