From chemistry-request@ccl.net Mon Oct  6 22:05:29 2003
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Message-ID: <3F821F45.5000300$at$scripps.edu>
Date: Mon, 06 Oct 2003 19:04:53 -0700
From: Craig Shepherd <shepherd$at$scripps.edu>
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Subject: Atomic contact energies
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Hello all,

Does anyone know of a program (standalone or incorporated into some
package) that will calculate atomic contact energies (ACE) for a protein 
structure(s)?
It seems that a lot of docking groups use them in their scoring 
functions, so my
hunch is the programs are out there.

So you know what I'm talking about, the ACE's I'm talking about are 
described in
the following references:

Miyazawa, S. and Jernigan, R.L. Estimation of effective interresidue 
contact energies from
protein crystal structures: quasi-chemical approximation.  1985.  
/Macromolecules/ 18:534-552.

Zhang, C. /et al. /Determinations of atomic desolvation energies from 
the structures of crystallized
proteins. 1997.  /J. Mol. Biol. /267:707-726.

Thanks a lot,

Craig Shepherd





From chemistry-request@ccl.net Tue Oct  7 00:03:25 2003
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Date: Tue, 7 Oct 2003 12:22:09 +0800 (HKT)
From: Hu LiHong <lhhu$at$yangtze.hku.hk>
To: chemistry$at$ccl.net
Subject: BR parameter in CHARMM
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Dear All,

Can someone give me the BR parameter (include charge parameters)in Charmm 
calculation?

Thanks a lot

Have a nice day,

Carol



From chemistry-request@ccl.net Tue Oct  7 04:30:50 2003
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Subject: CCL: how to do calculations of enzyme with ONIOM method 
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CHEMISTRYHi, everyone,
  I just want to do the geometry optimization with
ONIOM method using Gaussian.However, I met some
problems:
(1) How to decide the charge of enzyme ? How to decide
the charge of every layer?
(2)When I begin to run Gaussian, I consider all the
system as one layer for a try with Dreiding force
field.However I got the following error information:  
Unrecognized type string:  ZR3_4
 Unrecognzied type string in DecAty.
   Thank you for your time!

 




From chemistry-request@ccl.net Tue Oct  7 10:31:39 2003
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Date: Tue, 7 Oct 2003 07:30:25 -0700
Subject: Re: CCL:AM1, MNDO and PM3 software
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Depending on your OS, there are several incarnations of MOPAC  
available.  Most are built on MOPAC 6, which is a wonderfully stable  
code.  Personally, I use an older version of MacSpartan from  
Wavefunction (this is on a Mac G3 with Mac OS 9), with some work being  
done in WinMopac. For Windows, look at WinMopac, which is available  
free on the Web.  For Linux/UNIX, there are too many to count,  
altogether too many of which have been tinkered with.  If you have  
compilers and all, I would recommend getting a virgin copy from CCL or  
QCPE, and building your own executable ... you get the manual that way,  
too!

If you are not a developer, resist the temptation to use MOPAC 7, which  
was not intended as a production version.

Getting entropy and stuff in MOPAC involves doing a very rigorous  
geometry optimization, then a force and thermodynamics calculation.   
This can all be done in the same run, with the correct selection of  
keywords, and paging through the voluminous output.

Hope this helps,
Steve


On Monday, October 6, 2003, at 09:46 AM, Gongalo Deira Justino wrote:

> Dear CCL,
>
> I'm currently using AM1, MNDO and PM3 methods to optimize
> molecular geometries. Can you tell me any software,
> preferentially free, but not only, that does this? If it also
> allows me to get entropy and related stuff, it'd be cool.
>
> Thanks
> Gongalo
>
>
>
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