An improved united atom force field for simulation of mixed lipid bilayers

See Wing Chiu, Sagar A. Pandit, H. L. Scott, Eric Jakobsson

Research output: Contribution to journalArticlepeer-review


We introduce a new force field (43A1-S3) for simulation of membranes by the Gromacs simulation package. Construction of the force fields is by standard methods of electronic structure computations for bond parameters and charge distribution and specific volumes and heats of vaporization for small-molecule components of the larger lipid molecules for van der Waals parameters. Some parameters from the earlier 43A1 force field are found to be correct in the context of these calculations, while others are modified. The validity of the force fields is demonstrated by correct replication of X-ray form factors and NMR order parameters over a wide range of membrane compositions in semi-isotropic NTP 1 atm simulations. 43-A1-S3 compares favorably with other force fields used in conjunction with the Gromacs simulation package with respect to the breadth of phenomena that it accurately reproduces.

Original languageEnglish (US)
Pages (from-to)2748-2763
Number of pages16
JournalJournal of Physical Chemistry B
Issue number9
StatePublished - Mar 5 2009

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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