AMBER Archive (2008)

Subject: AMBER: the SPCFW water model

From: Vlad Cojocaru (
Date: Mon Jun 16 2008 - 11:19:34 CDT

Dear Ambers,

I have started studying the new features introduced in AMBER10 and I
observed the incorporation of the flexible water model SPCFW. I have
read the original paper about it and I am tempted to start some tests
with it in simulations without SHAKE.

Now I would like to ask you if somebody has started using this model and
if yes, are there any issues one should really take care of before using
it (beyond the time step issue). Second, if one wants to add lets say a
150 mM NaCl to a simulation with this water model, I assume none of the
ion parameters supplied with amber10 (including the new params from Tom
Cheatham's group) would be appropriate. Any comment or suggestion here ?
I assume one could apply the same scheme as Tom and S. Joung did to
derive ion parameters for this water model as well.

Are Tom's ion parameters already published? The Amber Tools manual says
"manuscript in preparation".

Thanks for any thoughts on this

Best wishes

Dr. Vlad Cojocaru

EML Research gGmbH Schloss-Wolfsbrunnenweg 33 69118 Heidelberg

Tel: ++49-6221-533266 Fax: ++49-6221-533298


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