[gmx-users] Error in pdb2gmx

vivek sharma viveksharma.iitb at gmail.com
Wed Aug 13 07:33:06 CEST 2008


Thanx David and Tsjerk,
  I tried the option given by Tsjerk on pdb file, then pdb2gmx command on
sorted  pdb file was giving the following error.
Sorting it all out...
Opening library file /usr/share/gromacs/top/ffG43a1.hdb
Opening library file /usr/share/gromacs/top/ffG43a1-n.tdb
Opening library file /usr/share/gromacs/top/ffG43a1-c.tdb
Processing chain 1 'A' (2108 atoms, 601 residues)
There are 393 donors and 383 acceptors
There are 533 hydrogen bonds

-------------------------------------------------------
Program pdb2gmx, VERSION 3.3.3
Source code file: hizzie.c, line: 267

Fatal error:
Incomplete ring in HIS194
-------------------------------------------------------

Here I am attaching the sorted.pdb file, it is having some amino acids
inserted between some other amino acid as below
text from sorted pdb shows GLN and GLU are inserted in HIS

ATOM    793  CD2 PHE A 129      -1.911  -9.897   3.599  1.00 43.21
C
ATOM    794  CE1 PHE A 129      -1.839 -11.242   5.997  1.00 41.19
C
ATOM    795  CE2 PHE A 129      -2.911 -10.794   3.911  1.00 41.19
C
ATOM    796  CZ  PHE A 129      -2.874 -11.465   5.104  1.00 42.09
C
ATOM    797  N   HIS A 130       1.739 -11.572   3.175  1.00 54.14
N
ATOM    798  CA  HIS A 130       1.520 -12.688   2.246  1.00 55.63
C
ATOM    799  C   HIS A 130       0.177 -13.421   2.474  1.00 55.34
C
ATOM     79  CD  GLN A  33       8.099  10.312  47.238  1.00 69.55
C
ATOM      7  CD  GLU A  25      -0.646  19.004  39.566  1.00 87.49
C
ATOM    800  O   HIS A 130      -0.859 -13.049   1.913  1.00 56.40
O
ATOM    801  CB  HIS A 130       2.726 -13.659   2.201  1.00 56.33
C
ATOM    802  CG  HIS A 130       3.542 -13.730   3.467  1.00 58.59
C
ATOM    803  ND1 HIS A 130       4.249 -12.655   3.970  1.00 60.95
N
ATOM    804  CD2 HIS A 130       3.828 -14.777   4.284  1.00 59.58
C
ATOM    805  CE1 HIS A 130       4.895 -13.022   5.066  1.00 60.24
C
ATOM    806  NE2 HIS A 130       4.657 -14.305   5.279  1.00 60.16
N
ATOM    807  N   ASP A 131       0.207 -14.462   3.285  1.00 54.76
N
ATOM    808  CA  ASP A 131      -0.954 -15.320   3.512  1.00 54.01
C
ATOM    809  C   ASP A 131      -1.040 -15.548   4.997  1.00 51.90
C
ATOM     80  OE1 GLN A  33       7.692  11.421  46.868  1.00 70.33
O

Kindly suggest any way to correct the .pdb file so that it can be converted
to .gro file

With Thanx,
Vivek


2008/8/12 Tsjerk Wassenaar <tsjerkw at gmail.com>

> Well,
>
> sed -ne '{/^\(ATOM\|HETATM\)/{s/^\(.\{21\}\)\(.\)\(.*\)$/\2\1\2\3/;p}}'
> file.pdb | sort | cut -b 2- > sorted.pdb
>
> sort of seems to do the trick. But it will place the chainless things
> first.
>
> Hope it helps,
>
> Tsjerk
>
> On Tue, Aug 12, 2008 at 3:13 PM, Justin A. Lemkul <jalemkul at vt.edu> wrote:
> >
> >
> > vivek sharma wrote:
> >>
> >> Hi david,
> >> Thanx again, but I want to ask what changes need to be done there in
> such
> >> cases.
> >>
> >
> > The chain identifier needs to be continuous.  That is, if you have atoms
> > with chain identifiers like:
> >
> > A
> > A
> > B
> > A
> > C
> > A
> > A
> >
> > they should be re-written as:
> >
> > A
> > A
> > A
> > A
> > A
> > B
> > C
> >
> > This can be accomplished with some work in a simple text editor.
> >
> > -Justin
> >
> >> With Thanx,
> >> Vivek
> >>
> >> 2008/8/12 David van der Spoel <spoel at xray.bmc.uu.se
> >> <mailto:spoel at xray.bmc.uu.se>>
> >>
> >>    vivek sharma wrote:
> >>
> >>        Hi David,
> >>        Thanks for the quick reply. My apologies for asking you again a
> >>        silly doubt as, I am doing this all for the first time. It will
> >>        be of great help if you can tell me how to do such correction
> >>        manually.
> >>
> >>
> >>    with a text editor, like emacs, notepad or whatever.
> >>
> >>
> >>        With Thanx,
> >>        Vivek
> >>
> >>        2008/8/12 David van der Spoel <spoel at xray.bmc.uu.se
> >>        <mailto:spoel at xray.bmc.uu.se> <mailto:spoel at xray.bmc.uu.se
> >>        <mailto:spoel at xray.bmc.uu.se>>>
> >>
> >>
> >>           vivek sharma wrote:
> >>
> >>               Hello there,
> >>               I am trying to run pdb2gmx on 3bzu.pdb file and got the
> >>               following error
> >>
> >>               Opening library file /usr/share/gromacs/top/
> >>               ffG43b1.rtp
> >>               Opening library file /usr/share/gromacs/top/aminoacids.dat
> >>               Reading 3bzu.pdb...
> >>               WARNING: all CONECT records are ignored
> >>               Read 'CORTICOSTEROID 11-BETA-DEHYDROGENASE ISOZYME 1; 6
> >>               BETA-HSD1', 8581 atoms
> >>               Opening library file /usr/share/gromacs/top/xlateat.dat
> >>               26 out of 26 lines of xlateat.dat converted succesfully
> >>               Analyzing pdb file
> >>
> >>               -------------------------------------------------------
> >>               Program pdb2gmx, VERSION 3.3.3
> >>               Source code file: pdb2gmx.c, line: 878
> >>
> >>               Fatal error:
> >>               Chain identifier 'A' was used in two non-sequential blocks
> >>               (residue 1034, atom 7961)
> >>               -------------------------------------------------------
> >>                as I am new to this field. I'm finding it very difficult
> to
> >>               find the reason and rectify it.
> >>               Any suggestion would be of great help......
> >>
> >>           This is a limitation in pdb2gmx. It expects the atoms in the
> >>        chain
> >>           A to be in sequence in the pdb file. You can manually sort
> >>        the pdb
> >>           file on the chain identifier.
> >>
> >>
> >>               With Thanx,
> >>               Vivek
> >>
> >> ------------------------------------------------------------------------
> >>
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> >>
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> >
> > --
> > ========================================
> >
> > Justin A. Lemkul
> > Graduate Research Assistant
> > 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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> >
>
>
>
> --
> Tsjerk A. Wassenaar, Ph.D.
> Junior UD (post-doc)
> Biomolecular NMR, Bijvoet Center
> Utrecht University
> Padualaan 8
> 3584 CH Utrecht
> The Netherlands
> P: +31-30-2539931
> F: +31-30-2537623
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