Parameters for Unsaturated Phospholipids

Chris Sheldahl chris at
Mon Jun 17 20:51:40 EST 1996

Does anyone know of any parameter files for phospholipids with unsaturated
hydrocarbon chains? 

I'm interested in modeling POPC bilayers but the only phospholipids listed
in the CHARMM22 topology have only saturated hydrocarbon chains. From
this, I'm *assuming* that parameters for the unsaturated fatty acid
carbons aren't in the CHARMM22 lipid parameter set. 

If the appropriate files don't exist, are there compounds in another
X-Plor/CHARMM set that I could draw parameters for the unsaturated chain
regions from?

Thanks in advance

Christopher Sheldahl

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