Thanks in advance
Adrien
------------------------------------------------------------------------
*From:* Justin A. Lemkul <jalem...@vt.edu>
*To:* adriendelm...@yahoo.com; Discussion list for GROMACS users
<gmx-users@gromacs.org>
*Sent:* Thursday, March 12, 2009 12:17:57 AM
*Subject:* Re: [gmx-users] get a box of 100 molecules
Adrien Delmont wrote:
> If I create an .rtp file for my molecule how can I use this file when
I producing gro and top files and Can I use this .rtp file with oplsaa
and gromos 96 force fields for two different md run successfuly ?
Because I plan to run md simulations for all atom and united atom force
fields and compare the results. Secondly If I use PRODRG , the only
force field I can use is oplsaa. Is it true ? Can't I use a gromos 96
force field ?
>
I think you should start by reading the manual about .rtp files and how
they are used. Each force field has its own .rtp, so no, you cannot use
the same .rtp file with different force fields. Make a local copy (in
your working directory) if you choose to modify your .rtp files; if you
are unsure of what you are doing you can seriously screw things up.
PRODRG produces Gromos-compatible force fields, not OPLS; this is
answered in the FAQ at the PRODRG site.
I reiterate: read the manual, be comfortable with how the file types are
used, then proceed.
-Justin
> --- On *Wed, 3/11/09, Justin A. Lemkul /<jalem...@vt.edu
<mailto:jalem...@vt.edu>>/* wrote:
>
> From: Justin A. Lemkul <jalem...@vt.edu <mailto:jalem...@vt.edu>>
> Subject: Re: [gmx-users] get a box of 100 molecules
> To: "Gromacs Users' List" <gmx-users@gromacs.org
<mailto:gmx-users@gromacs.org>>
> Date: Wednesday, March 11, 2009, 9:53 PM
>
> Adrien Delmont wrote:
> > The molecule I use is a simple hydrocarbon ( n-heptane ) and I
think that
> I should add something like dihedral, bond, angle parameters
after I search the
> literature. I found some information about that. I think I will
add parameters
> into the related force fields .itp file. Is it true ? And then I
will create a
> box of 100 molecules without any error.
> >
> Most (if not all) of the parameters you will need will already be
present in
> the force field. No modification of any of these files should be
necessary.. If
> you want to use pdb2gmx to create your topology, you need to
create an .rtp
> entry. For a simple alkane (especially with a UA representation),
it should be
> trivial to write the topology by hand with a text editor and a
thorough
> understanding of Chapter 5.
>
> Alternate ideas:
>
> 1. Use PRODRG to generate a rough topology. Verify its contents before
> proceeding, make any modifications you need, and validate the
resulting
> topology.
> 2. Don't use Gromos96. AFAIK, none of the Gromos variants deal
very well
> with hydrocarbon chains. OPLS might be better, but I think there
are some
> limitations there, too.
>
> -Justin
>
> > --- On *Wed, 3/11/09, Justin A. Lemkul /<jalem...@vt.edu
<mailto:jalem...@vt.edu>>/* wrote:
> > > From: Justin A. Lemkul <jalem...@vt.edu
<mailto:jalem...@vt.edu>>
> > Subject: Re: [gmx-users] get a box of 100 molecules
> > To: adriendelm...@yahoo..com
<mailto:adriendelm...@yahoo..com>, "Discussion list for GROMACS
> users"
> > <gmx-users@gromacs.org <mailto:gmx-users@gromacs.org>>
> > Date: Wednesday, March 11, 2009, 9:11 PM
> > > Adrien Delmont wrote:
> > > I just want to add missing parameters for my molecule in order
> to get
> > ...gro and top files for example GROMOS96 43a2 force field .
How can I
> add
> > missing parameters ? I didn't find any information about this
> procedure.
> > I'm waiting for your help.
> > > > You'll have to define what you mean by
"parameters" - is
> this
> > some new small molecule that has not been parameterized under
this
> force field? Are you starting from scratch? If so, this is not
a trivial
> problem for a
> > beginner. Read here:
> > > http://wiki.gromacs.org/index.php/Parameterization
> > > If you have adequate parameters for most of your
molecule and are
> missing
> > something like a dihedral, etc. then read the primary
literature and
> derive it
> > yourself. This process is also complicated, but is probably
less work
> than
> > coming up with parameters for a brand new molecule.
> > > -Justin
> > > > Thanks in advance
> > > > > --- On *Wed, 3/11/09, Mark Abraham
> /<mark.abra...@anu.edu.au <mailto:mark.abra...@anu.edu.au>>/*
> > wrote:
> > > > From: Mark Abraham <mark.abra...@anu.edu.au
<mailto:mark.abra...@anu.edu.au>>
> > > Subject: Re: [gmx-users] get a box of 100 molecules
> > > To: "Discussion list for GROMACS users"
> > <gmx-users@gromacs.org <mailto:gmx-users@gromacs.org>>
> > > Date: Wednesday, March 11, 2009, 4:58 PM
> > > > Adrien Delmont wrote:
> > > > > >
> >
------------------------------------------------------------------------
> > > > *From:* Adrien Delmont <adriendelm...@yahoo.com
<mailto:adriendelm...@yahoo.com>>
> > > > *To:* jalem...@vt.edu <mailto:jalem...@vt.edu>
> > > > *Sent:* Wednesday, March 11, 2009 6:09:53 PM
> > > > *Subject:* Re: [gmx-users] get a box of 100 molecules
> > > > > I didn't get gro and top files with any
> force field
> > in Gromacs. I
> > > basicly want to use oplsaa and GROMOS96 43a2 force field
> (improved
> > alkane
> > > dihedrals) . I think I should add all the parameters
but how
> can I
> > add my
> > > parametes both into oplsaa and GROMOS96 43a2 force field ?
> > > > You can't just mix force fields. See
> > > http://wiki.gromacs.org/index.php/force_field
> > > > Mark
> > > _______________________________________________
> > > gmx-users mailing list gmx-users@gromacs.org
<mailto:gmx-users@gromacs.org>
> > > http://www.gromacs.org/mailman/listinfo/gmx-users
> > > Please search the archive at http://www.gromacs.org/search
> before
> > posting!
> > > Please don't post (un)subscribe requests to the list. Use
> the www
> > interface
> > > or send it to gmx-users-requ...@gromacs.org
<mailto:gmx-users-requ...@gromacs.org>.
> > > Can't post? Read
> http://www.gromacs.org/mailing_lists/users.php
> > > > > >
>
------------------------------------------------------------------------
> > > > _______________________________________________
> > > gmx-users mailing list gmx-users@gromacs.org
<mailto:gmx-users@gromacs.org>
> > > http://www.gromacs.org/mailman/listinfo/gmx-users
> > > Please search the archive at http://www.gromacs.org/search
before
> posting!
> > > Please don't post (un)subscribe requests to the list. Use the
> www
> > interface or send it to gmx-users-requ...@gromacs.org
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> > > Can't post? Read
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> > > -- ========================================
> > > Justin A. Lemkul
> > Graduate Research Assistant
> > ICTAS Doctoral Scholar
> > Department of Biochemistry
> > Virginia Tech
> > Blacksburg, VA
> > jalemkul[at]vt.edu <http://vt.edu> | (540) 231-9080
> > http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
> > > ========================================
> > >
> -- ========================================
>
> Justin A. Lemkul
> Graduate Research Assistant
> ICTAS Doctoral Scholar
> Department of Biochemistry
> Virginia Tech
> Blacksburg, VA
> jalemkul[at]vt.edu | (540) 231-9080
> http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
>
> ========================================
> _______________________________________________
> gmx-users mailing list gmx-users@gromacs.org
<mailto:gmx-users@gromacs.org>
> http://www.gromacs.org/mailman/listinfo/gmx-users
> Please search the archive at http://www.gromacs.org/search before
posting!
> Please don't post (un)subscribe requests to the list. Use the www
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> or send it to gmx-users-requ...@gromacs.org
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> Can't post? Read http://www.gromacs.org/mailing_lists/users.php
>
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> gmx-users mailing list gmx-users@gromacs.org
<mailto:gmx-users@gromacs.org>
> http://www.gromacs.org/mailman/listinfo/gmx-users
> Please search the archive at http://www.gromacs.org/search before
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> Please don't post (un)subscribe requests to the list. Use the www
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> Can't post? Read http://www.gromacs.org/mailing_lists/users.php
-- ========================================
Justin A. Lemkul
Graduate Research Assistant
ICTAS Doctoral Scholar
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
========================================
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