[gmx-users] united atoms membranes & timestep

[J Simms]

Hi All, 
	Hope everyone had a Good New Year. Just a quick question, I 
just wondered how high a timestep I can get away with using a 
united atom lipid forcefield?? Does anyone have any experience 
with this. The reason I want to find out, is that I have got a 
membrane protein that I want to use dummy atoms & heavy 
hydrogens with so that I can increase the timestep as with Antons 
papers. Can I increase the timestep and keep a well defined 
membrane or do I have to add the bilayer to the .rtp file and get 
pdb2gmx to deal with it. 

Thanks in advance for any help.;-)
John ;-)