[gmx-users] RE: Membrane simulation with OPLS ff.

2013-09-27 Thread Karthigeyan.Nagarajan
Thanks Chris.

-Original Message-
From: gmx-users-boun...@gromacs.org [mailto:gmx-users-boun...@gromacs.org] On 
Behalf Of Christopher Neale
Sent: Thursday, September 26, 2013 7:47 PM
To: gmx-users@gromacs.org
Subject: [gmx-users] Membrane simulation with OPLS ff.

Dear Karthi:

As far as I am aware, there is no OPLSAA lipid force field. I have used Berger 
lipids with OPLSAA protein ( 
http://www.pomeslab.com/files/lipidCombinationRules.pdf ) but that is mixing a 
UA lipid with an AA protein so be aware of possible problems arising out of 
that.

Charmm has proteins and lipids, but charmm lipids require charmm tip3p water 
(or at least tip4p or spc, certainly not regular tip3p) and are thus slower to 
simulate in gromacs. I'm more recently using the Slipids (stockholm lipids) and 
Amber99SB-ILDN protein forcefield.

Chris.

-- original message --
Is OPLSAA forcefield data already available for POPC membranes.  I am 
interested in simulation of proteins in POPC membrane.
Thank you.
Best Regards
Karthi.
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RE: [gmx-users] Membrane simulation with OPLS ff.

2013-09-27 Thread Karthigeyan.Nagarajan
Thanks Justin.

-Original Message-
From: gmx-users-boun...@gromacs.org [mailto:gmx-users-boun...@gromacs.org] On 
Behalf Of Justin Lemkul
Sent: Thursday, September 26, 2013 7:51 PM
To: Discussion list for GROMACS users
Subject: Re: [gmx-users] Membrane simulation with OPLS ff.



On 9/26/13 10:47 PM, Christopher Neale wrote:
 Dear Karthi:

 As far as I am aware, there is no OPLSAA lipid force field. I have 
 used Berger lipids with OPLSAA protein ( 
 http://www.pomeslab.com/files/lipidCombinationRules.pdf ) but that is mixing 
 a UA lipid with an AA protein so be aware of possible problems arising out of 
 that.


There are OPLS-compatible lipids, though they are UA, but specifically designed 
to be used with OPLS-AA:

dx.doi.org/10.1021/ct900086b

I have not seen these parameters used very widely, though.

 Charmm has proteins and lipids, but charmm lipids require charmm tip3p 
 water (or at least tip4p or spc, certainly not regular tip3p) and are 
 thus slower to simulate in gromacs. I'm more recently using the Slipids 
 (stockholm lipids) and Amber99SB-ILDN protein forcefield.


Solid choices.

-Justin

--
==

Justin A. Lemkul, Ph.D.
Postdoctoral Fellow

Department of Pharmaceutical Sciences
School of Pharmacy
Health Sciences Facility II, Room 601
University of Maryland, Baltimore
20 Penn St.
Baltimore, MD 21201

jalem...@outerbanks.umaryland.edu | (410) 706-7441

==
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[gmx-users] Membrane simulation with OPLS ff.

2013-09-26 Thread Karthigeyan.Nagarajan
Dear GMX users:
Is OPLSAA forcefield data already available for POPC membranes.  I am 
interested in simulation of proteins in POPC membrane.
Thank you.
Best Regards
Karthi.
--
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