From chemistry-request@ccl.net Thu Jul  1 03:26:40 2004
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From: "Tamas E. Gunda" <tgunda|at|puma.unideb.hu>
To: <chemistry|at|ccl.net>
References: <000b01c45ede$6d804510$b400a8c0@fedor>
Subject: Re: CCL: software to convert  XYZ format to PDB ?
Date: Thu, 1 Jul 2004 10:34:08 +0100
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Hmm... I would be also interested to know such program. Even the "big"
commercial ones usually produce "correct" pdb files only, if one uses their
own peptide builder. To recognize automatically the amino acids, enzyme
prostetic groups, nucleosides, which are defined in the pdb format, is not
simple.

Tamas E. Gunda
tgunda [AT] puma.unideb.hu




----- Original Message ----- 
From: "Michael" <shokhen|at|netvision.net.il>
To: <CHEMISTRY|at|ccl.net>
Sent: Wednesday, June 30, 2004 21:11 PM
Subject: CCL:CCL software to convert XYZ format to PDB ?


> Dear CCLers,
>
>
>
> I need to convert protein structure presented as XYZ (Cartesian coordinate
> file)
>
> to the PDB file format.
>
> The problem is that many software packages can do the job but not
> completely.
>
> In other words, when such software reads an XYZ file (see the fragment
> below):
>
>
>
>   N       -1.21000       43.30600      -19.48400
>
>   C       -1.45100       43.83100      -20.83200
>
>   C       -1.89300       45.28700      -20.70900
>
>   O       -1.42200       46.16400      -21.43800
>
>
>
> it generates the following PDB analog with unknown residual names and
> numbers:
>
>
>
> ATOM    462  N   UNK A   1      -1.210  43.306 -19.484  1.00  0.00
>
> ATOM    463  C   UNK A   1      -1.451  43.831 -20.832  1.00  0.00
>
> ATOM    464  C   UNK A   1      -1.893  45.287 -20.709  1.00  0.00
>
> ATOM    465  O   UNK A   1      -1.422  46.164 -21.438  1.00  0.00
>
>
>
> while the correct pdb file must specify the residual names and numbers:
>
>
>
> ATOM    462  N   VAL    32      -1.210  43.306 -19.484  1.00 14.04
> N
>
> ATOM    463  CA  VAL    32      -1.451  43.831 -20.832  1.00  6.48
> C
>
> ATOM    464  C   VAL    32      -1.893  45.287 -20.709  1.00  8.17
> C
>
> ATOM    465  O   VAL    32      -1.422  46.164 -21.438  1.00 10.91
> O
>
>
>
> I would highly appreciate if somebody can point me to the reliable free
> software for Windows.
>
>
>
> Kind regards,
>
> Michael
>
>
>
>
> -= This is automatically added to each message by the mailing script =-
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>
>
>
>
>



From chemistry-request@ccl.net Thu Jul  1 04:51:46 2004
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Date: Thu, 1 Jul 2004 11:57:03 +0200 (MEST)
From: Michel Petitjean <ptitjean~at~itodys.jussieu.fr>
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Subject: CCL: Re: software to convert  XYZ format to PDB ?
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To: <chemistry~at~ccl.net>
Subject: CCL:software to convert  XYZ format to PDB ?

Imagine that you are the programmer: how could you know from
the atomic symbols and the X,Y,Z coordinates what could be
the residue ? The N,CA,C,O coordinates of all residues of
all known proteins in the PDB offer quite similar 3D patterns.
If the residue information is not read by the programme,
it will not be output by the programme.


Michel Petitjean,                     Email: petitjean~at~itodys.jussieu.fr
ITODYS (CNRS, UMR 7086)                      ptitjean~at~ccr.jussieu.fr
1 rue Guy de la Brosse                Phone: +33 (0)1 44 27 48 57
75005 Paris, France.                  FAX  : +33 (0)1 44 27 68 14
http://petitjeanmichel.free.fr/itoweb.petitjean.html
...................................................................
Tamas E. Gunda <tgunda~at~puma.unideb.hu> wrote:
>
> I need to convert protein structure presented as XYZ (Cartesian coordinate
> file)
> to the PDB file format.
> The problem is that many software packages can do the job but not
> completely.
> In other words, when such software reads an XYZ file (see the fragment
> below):
>
>   N       -1.21000       43.30600      -19.48400
>   C       -1.45100       43.83100      -20.83200
>   C       -1.89300       45.28700      -20.70900
>   O       -1.42200       46.16400      -21.43800
>
> it generates the following PDB analog with unknown residual names and
> numbers:
>
> ATOM    462  N   UNK A   1      -1.210  43.306 -19.484  1.00  0.00
> ATOM    463  C   UNK A   1      -1.451  43.831 -20.832  1.00  0.00
> ATOM    464  C   UNK A   1      -1.893  45.287 -20.709  1.00  0.00
> ATOM    465  O   UNK A   1      -1.422  46.164 -21.438  1.00  0.00
>
> while the correct pdb file must specify the residual names and numbers:
>
> ATOM    462  N   VAL    32      -1.210  43.306 -19.484  1.00 14.04
> N
> ATOM    463  CA  VAL    32      -1.451  43.831 -20.832  1.00  6.48
> C
> ATOM    464  C   VAL    32      -1.893  45.287 -20.709  1.00  8.17
> C
> ATOM    465  O   VAL    32      -1.422  46.164 -21.438  1.00 10.91
> O
>

From chemistry-request@ccl.net Thu Jul  1 05:32:51 2004
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From: hinsen^at^cnrs-orleans.fr
Subject: Re: CCL:software to convert  XYZ format to PDB ?
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On Jul 1, 2004, at 11:57, Michel Petitjean wrote:

> Imagine that you are the programmer: how could you know from
> the atomic symbols and the X,Y,Z coordinates what could be
> the residue ? The N,CA,C,O coordinates of all residues of
> all known proteins in the PDB offer quite similar 3D patterns.

If I had to do this (fortunately I don't), I'd first identify the 
peptide planes as patterns of pairwise distances (they are quite 
rigid). I'd then identify the sidechains atom by atom starting from the 
C-alphas, again by distance criteria. Not a trivial task, but not an 
impossible one either.

---------------------------------------------------------------------
Konrad Hinsen
Laboratoire Lion Brillouin, CEA Saclay,
91191 Gif-sur-Yvette Cedex, France
Tel.: +33-1 69 08 79 25
Fax: +33-1 69 08 82 61
E-Mail: hinsen^at^llb.saclay.cea.fr
---------------------------------------------------------------------




From chemistry-request@ccl.net Thu Jul  1 13:30:35 2004
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Date: Thu, 01 Jul 2004 20:35:53 +0200
From: Carsten Detering <detering_at_u.washington.edu>
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Subject: gaussian03 optimization to transition state
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Hi all,

  I would like to optimize a complex involving a bifurcated hydrogen 
bond between three nitrogen atoms (trimethylamine and triazen) to a 
saddle point (which I know exists from previous Mopac calculations). 
Taking this header line in the input file

B3LYP/6-31g* POpt=(Saddle=1) nosymmetry test

the optimization finishes with an error

optimization stopped
	--wrong number of Negative eigenvalues: Desired= 1 Actual= 2
	--Flag reset to prevent archiving

Then I get, at the bottom, the typical proverb that you see only when a 
calculation has successfully finished, and then

Could anybody make some suggestions how to fix this?

Thanks a lot in advance,

Carsten


From chemistry-request@ccl.net Thu Jul  1 13:16:07 2004
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Date: Thu, 1 Jul 2004 20:21:24 +0200 (=?ISO-8859-2?Q?=8Crodkowoeuropejski_czas_letni?=)
From: Mariusz Sterzel <sterzel_at_chemia.uj.edu.pl>
To: chemistry_at_ccl.net
Subject: NMR for Nitrogen atom in Gaussian 03
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Dear All,

I have run NMR calculations and I don't know for which nitrogen isotope,
N^{14} or N^{15}, my calculations were performed.
Can someone help me with this? There is nothing written in a gaussian
log file.

Best regards,

Mariusz Sterzel


--
Mariusz Sterzel
Email sterzel_at_chemia.uj.edu.pl



From chemistry-request@ccl.net Thu Jul  1 18:02:50 2004
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Date: Thu, 01 Jul 2004 18:08:01 CDT
From: Yan Zhao <yzhao_at_chem.umn.edu>
Subject: Re: CCL:gaussian03 optimization to transition state
To: Carsten Detering <detering_at_u.washington.edu>, chemistry_at_ccl.net
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Substitute "POpt=(Saddle=1)" for "opt=(ts,noeigentest,maxcycle=100)", then
it will not stop because the wrong number of Negaative eigenvalues, if the
optimization does not converge, you probably should try some better initial
guesses of the geometry or add "calcfc" in the opt keyword.

Yan 

On 1 Jul 2004, Carsten Detering wrote:
> Hi all,
> 
>   I would like to optimize a complex involving a bifurcated hydrogen 
> bond between three nitrogen atoms (trimethylamine and triazen) to a 
> saddle point (which I know exists from previous Mopac calculations). 
> Taking this header line in the input file
> 
> B3LYP/6-31g* POpt=(Saddle=1) nosymmetry test
> 
> the optimization finishes with an error
> 
> optimization stopped
> 	--wrong number of Negative eigenvalues: Desired= 1 Actual= 2
> 	--Flag reset to prevent archiving
> 
> Then I get, at the bottom, the typical proverb that you see only when a 
> calculation has successfully finished, and then
> 
> Could anybody make some suggestions how to fix this?
> 
> Thanks a lot in advance,
> 
> Carsten
> 
> 
> -= This is automatically added to each message by the mailing script =-
> To send e-mail to subscribers of CCL put the string CCL: on your Subject:
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> 
> 
> 
> 
> 
> 
***************************************
Yan Zhao     yzhao_at_chem.umn.edu
Smith Hall 232      (612)-625-5311
Department of Chemistry
University of Minnesota
207 Pleasant St SE
Minneapolis, MN 55455
***************************************



