On 9/27/13 3:17 PM, Ehsan Sadeghi wrote:
Many thanks Justin.

Here is my .pdb file:

ATOM      1  C   LIG     1     -10.450   5.214  -1.717  1.00  0.00           C
ATOM      2  C   LIG     1      -8.424   5.477  -1.030  1.00  0.00           C
ATOM      3  C   LIG     1      -6.603   5.864  -0.166  1.00  0.00           C
ATOM      4  F   LIG     1      -6.651   6.230  -1.691  1.00  0.00           F
ATOM      5  F   LIG     1      -8.417   4.546  -2.349  1.00  0.00           F
ATOM      6  C   LIG     1      -5.705   3.003   1.204  1.00  0.00           C
ATOM      7  F   LIG     1      -7.247   5.032   1.683  1.00  0.00           F
ATOM      8  F   LIG     1      -8.521   5.307   0.400  1.00  0.00           F
ATOM      9  C   LIG     1      -3.913   4.878   2.109  1.00  0.00           C
ATOM     10  F   LIG     1      -4.358   3.650  -0.024  1.00  0.00           F
ATOM     11  F   LIG     1      -6.198   1.346   0.214  1.00  0.00           F
ATOM     12  C   LIG     1      -1.306   5.673   2.286  1.00  0.00           C
ATOM     13  F   LIG     1      -3.429   3.111   0.668  1.00  0.00           F
ATOM     14  F   LIG     1      -2.358   3.855   1.570  1.00  0.00           F
ATOM     15  C   LIG     1       0.246   3.040   2.048  1.00  0.00           C
ATOM     16  F   LIG     1      -0.514   4.358   3.241  1.00  0.00           F
ATOM     17  F   LIG     1      -0.928   3.807   1.741  1.00  0.00           F
ATOM     18  C   LIG     1       1.925   3.706   2.014  1.00  0.00           C
ATOM     19  F   LIG     1      -0.226   2.548   0.094  1.00  0.00           F
ATOM     20  F   LIG     1       0.215   1.482   1.590  1.00  0.00           F
ATOM     21  F   LIG     1     -11.789   4.355  -2.598  1.00  0.00           F
ATOM     22  F   LIG     1     -11.552   4.133  -0.632  1.00  0.00           F
ATOM     23  F   LIG     1       2.299   2.385   2.438  1.00  0.00           F
ATOM     24  F   LIG     1       1.831   1.994   1.526  1.00  0.00           F
ATOM     25  OM  SCH     2       3.334   3.720   1.360  1.00  0.00           O
ATOM     26  C   SCH     2       5.273   2.985   0.897  1.00  0.00           C
ATOM     27  C   SCH     2       6.100   2.445   1.642  1.00  0.00           C
ATOM     28  F   SCH     2       4.528   2.997   1.631  1.00  0.00           F
ATOM     29  F   SCH     2       6.122   3.473   0.467  1.00  0.00           F
ATOM     30  C   SCH     2       7.274   1.746   2.026  1.00  0.00           C
ATOM     31  OM  SCH     2       5.454   2.160   2.446  1.00  0.00           O
ATOM     32  F   SCH     2       6.788   2.944   0.993  1.00  0.00           F
ATOM     33  F   SCH     2       7.031   1.025   2.779  1.00  0.00           F
ATOM     34  F   SCH     2       8.010   2.431   2.393  1.00  0.00           F
ATOM     35  F   SCH     2       7.678   1.241   1.173  1.00  0.00           F
ATOM     36  C   SCH     2       5.042   1.305   2.243  1.00  0.00           C
ATOM     37  C   SCH     2       5.168   0.043   2.583  1.00  0.00           C
ATOM     38  F   SCH     2       4.938   1.296   1.178  1.00  0.00           F
ATOM     39  F   SCH     2       4.377   1.446   3.070  1.00  0.00           F
ATOM     40  S   SCH     2       5.516  -1.463   2.733  1.00  0.00           S
ATOM     41  F   SCH     2       4.304   0.015   3.213  1.00  0.00           F
ATOM     42  F   SCH     2       6.073   0.088   2.014  1.00  0.00           F
ATOM     43  O   SCH     2       4.555  -2.079   3.473  1.00  0.00           O
ATOM     44  H   SCH     2       4.772  -3.020   3.567  1.00  0.00           H
ATOM     45  O   SCH     2       6.692  -1.508   1.977  1.00  0.00           O
ATOM     46  O   SCH     2       6.001  -2.846   2.762  1.00  0.00           O
CONECT    1    2   21   22
CONECT    2    1    3    4    5
CONECT    2
CONECT    3    2    6    7    8
CONECT    3
CONECT    4    2
CONECT    5    2
CONECT    6    3    9   10   11
CONECT    6
CONECT    7    3
CONECT    8    3
CONECT    9    6   12   13   14
CONECT    9
CONECT   10    6
CONECT   11    6
CONECT   12    9   15   16   17
CONECT   12
CONECT   13    9
CONECT   14    9
CONECT   15   12   18   19   20
CONECT   15
CONECT   16   12
CONECT   17   12
CONECT   18   15   23   24   25
CONECT   18
CONECT   19   15
CONECT   20   15
CONECT   21    1
CONECT   22    1
CONECT   23   18
CONECT   24   18
CONECT   25   18   26
CONECT   26   25   27   28   29
CONECT   26
CONECT   27   26   30   31   32
CONECT   27
CONECT   28   26
CONECT   29   26
CONECT   30   27   33   34   35
CONECT   30
CONECT   31   27   36
CONECT   32   27
CONECT   33   30
CONECT   34   30
CONECT   35   30
CONECT   36   31   37   38   39
CONECT   36
CONECT   37   36   40   41   42
CONECT   37
CONECT   38   36
CONECT   39   36
CONECT   40   37   43   45   46
CONECT   40
CONECT   41   37
CONECT   42   37
CONECT   43   40   44
CONECT   44   43
CONECT   45   40
CONECT   46   40
MASTER        0    0    0    0    0    0    0    0   46    0   46    0
END

-------------------------------------------------
I already added LIG and SCH in residuetypes.dat and defined the atoms for each 
residue in aminoacids.rtp in gromos. When I run pdb2gmx -f nafion.pdb
I receive this error:


Warning: Starting residue LIG1 in chain not identified as Protein/RNA/DNA.
Warning: Starting residue SCH2 in chain not identified as Protein/RNA/DNA.
Problem with chain definition, or missing terminal residues.
This chain does not appear to contain a recognized chain molecule.
If this is incorrect, you can edit residuetypes.dat to modify the behavior.
8 out of 8 lines of specbond.dat converted successfully

-------------------------------------------------------
Program pdb2gmx, VERSION 4.6.3
Source code file: 
/home/ehssad/Downloads/Gromacs/gromacs-4.6.3/src/kernel/resall.c, line: 642

Fatal error:
Residue 'LIG' not found in residue topology database
For more information and tips for troubleshooting, please check the GROMACS


You still haven't provided any real useful diagnostic information. What do the .rtp entries look like? Which force field did you modify? Did you modify a local copy of it, or the one in $GMXLIB? Based on that, are you making the right choice when running pdb2gmx?

-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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