Qin Qiao wrote:


2011/1/20 Justin A. Lemkul <jalem...@vt.edu <mailto:jalem...@vt.edu>>



    Qin Qiao wrote:



        2011/1/20 Justin A. Lemkul <jalem...@vt.edu
        <mailto:jalem...@vt.edu> <mailto:jalem...@vt.edu
        <mailto:jalem...@vt.edu>>>



           Qin Qiao wrote:



               2011/1/20 Justin A. Lemkul <jalem...@vt.edu
        <mailto:jalem...@vt.edu>
               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>
        <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>

               <mailto:jalem...@vt.edu <mailto:jalem...@vt.edu>>>>




                  Qin Qiao wrote:

                      Dear all,

                      I would like to try a new forcefield in Gromacs
        4.5.3. What
                      should I do after I copied the ff to
        /share/gromacs/top
                      directory? It seems the original FF.dat doesn't
        exist in
               4.5.3..
                      Could you give me some help?


                  pdb2gmx detects forcefield directories by searching
        for names
               that
                  end in .ff, then looking in that directory for a
        "forcefield.doc"
                  file that contains a brief description of the force field.

                  -Justin


               Thanks. But I cannot find the new forcefield when I used
               pdb2gmx.. the folder of ff is named 'PACE.ff'


           It must also contain a forcefield.itp file to be recognized, and
           ultimately, to work at all.  I did a test of minimum
        requirements,
           and only after I added a dummy forcefield.itp file to the test.ff
           subdirectory did pdb2gmx recognize the new force field.

           -Justin


        There is an .itp file in the ff.. but it doesn't work..
        strange.. is there any other possibility?


    It works just fine for me.  To be sure, I used the name "PACE.ff"
    instead of my generic "test.ff" to make sure capitalization or
    something foolish wasn't a problem.  It worked fine, adding "PACE"
    as entry 16 in the pdb2gmx menu (I also have another custom force
    field, so the order of your pdb2gmx output may be different).

    The other thing to try is to build the force field in your working
    directory and see if pdb2gmx finds it there.  This is, of course,
    not strictly required (and would be very inconvenient), but it could
    be a useful diagnostic.

    -Justin


Thanks. But it doesn't work.. and I tried to copy the exact files in the charmm.ff to a new test.ff, and pdb2gmx doesn't find test.ff..


Do you have multiple versions of Gromacs on the same machine? If so, are you calling the right pdb2gmx?

-Justin

                      Best,

                      Qin


                  --     ========================================

                  Justin A. Lemkul
                  Ph.D. Candidate
                  ICTAS Doctoral Scholar
                  MILES-IGERT Trainee
                  Department of Biochemistry
                  Virginia Tech
                  Blacksburg, VA
                  jalemkul[at]vt.edu <http://vt.edu> <http://vt.edu>
        <http://vt.edu> | (540)

               231-9080

                  http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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           --     ========================================

           Justin A. Lemkul
           Ph.D. Candidate
           ICTAS Doctoral Scholar
           MILES-IGERT Trainee
           Department of Biochemistry
           Virginia Tech
           Blacksburg, VA
           jalemkul[at]vt.edu <http://vt.edu> <http://vt.edu> | (540)
        231-9080
           http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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-- ========================================

    Justin A. Lemkul
    Ph.D. Candidate
    ICTAS Doctoral Scholar
    MILES-IGERT Trainee
    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

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--
========================================

Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
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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