Effects of phospholipid composition on the transfer of a small cationic peptide across a model biological membrane. The transfer of a lysine amino acid analogue across phospholipid membrane models was investigated using molecular-dynamics simulations. The evolution of the protonation state of this small peptide as a function of its position inside the membrane was studied by determining the local pKa by means of free-energy calculations. Permeability and mean-first-passage time were evaluated and showed that the transfer occurs on the submillisecond time scale. Comparative studies were conducted to evaluate changes in the pKa arising from differences in the phospholipid chemical structure. We compared, hence, the effect of an ether vs an ester linkage of the lipid headgroup as well as linear vs branched lipid tails. The study reveals that protonated lysine residues can be buried further inside an ether lipid membrane than an ester lipid membrane, while branched lipids are found to stabilize less the charged form compared to their unbranched lipid chain counterparts.J. Chem. Theory Comput. 2013

Recent publications

Comer, J.; Schulten, K.; Chipot, C.
Calculation of lipid-bilayer permeabilities using an average force
J.Chem. Theory Comput.
  2014, 10 (2), 554-564.

Marquardt, R.; Hénin, J.; Dehez, F.; Chipot, C.,
Dynamiques moléculaires quantiques et classiques
L’Actualité Chimique
  2014,  (382-383), 56-62.

Comer, J.; Roux, B.; Chipot, C.;
Achieving ergodic sampling using replica-exchange free-energy calculations
Mol. Sim.
  2014, 40 (1-3),  218-228.


- A position for a postdoctoral candidate is opened. Contact us for more information.
- An update of ParseFEP is available in the latest version of VMD.
- 新的分子动力学讲义 (Dissemination).


Laboratoire International Associé
Unité mixte de recherche n°7565
Université de Lorraine, B.P. 70239
54506 Vandoeuvre-lès-Nancy Cedex, France


Phone: +33.(0)
Fax: +33.(0)
How to reach us