When I created em.tpr I got the followings notes:<br><b><u>NOTE 1 [file topol.top, line 52]:</u></b><br>  System has non-zero total charge: -1.500000e+01<br>

  <br><u><b>NOTE 2 [file topol.top]:</b></u><br>  The largest charge group contains 11 atoms.<br>  Since atoms only see each other when the centers of geometry of the charge<br>  groups they belong to are within the cut-off distance, too large charge<br>




  groups can lead to serious cut-off artifacts.<br>  For efficiency and accuracy, charge group should consist of a few atoms.<br>  For all-atom force fields use: CH3, CH2, CH, NH2, NH, OH, CO2, CO, etc.<br><br>then, I tried to add ions.<br>
<br>Thanks<br><br><div class="gmail_quote">01 Nisan 2011 15:33 tarihinde Justin A. Lemkul <span dir="ltr">&lt;<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a>&gt;</span> yazdı:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">

<div><br>
<br>
ahmet yıldırım wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Dear users,<br>
<br>
I created nonaminoacid TRS.itp and EDO.itp files using ProDrg Beta.<br>
<br>
</blockquote>
<br></div>
...and hopefully did a complete re-parameterization of the nonsense charges it gives.<br>
<br>
<a href="http://www.gromacs.org/Downloads/Related_Software/PRODRG#Tips" target="_blank">http://www.gromacs.org/Downloads/Related_Software/PRODRG#Tips</a><br>
<br>
That&#39;s an aside, completely unrelated to your actual problem, though.<div><br>
<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
genion -s em.tpr -o solvated.gro -nname Na -nn 15 -g em.log<br>
select group:13<br>
Fatal error:<br>
The solvent group SOL is not continuous: index[984]=5334, index[985]=5355<br>
For more information and tips for troubleshooting, please check the GROMACS<br>
website at <a href="http://www.gromacs.org/Documentation/Errors" target="_blank">http://www.gromacs.org/Documentation/Errors</a><br>
<br>
</blockquote>
<br></div>
You still haven&#39;t answered the second question I posed below.  I assume this &quot;em.tpr&quot; file has not been re-generated from a properly continuous .gro and .top combination.  If either were out of order with respect to the other (i.e. changing the .top and not the .gro), you would have gotten a fatal error from grompp when creating em.tpr.<br>


<br>
-Justin<br>
<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
<br>
01 Nisan 2011 15:17 tarihinde Justin A. Lemkul &lt;<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a> &lt;mailto:<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a>&gt;&gt; yazdı:<div><div>

</div><div><br>
<br>
<br>
<br>
    ahmet yıldırım wrote:<br>
<br>
        I tried SOL 44453 but I still the same error<br>
<br>
<br>
    Are you using some index file that is specifying a discontinuous<br>
    water group? Have you properly re-created your genion input .tpr<br>
    file from this new topology?<br>
<br>
    -Justin<br>
<br>
        01 Nisan 2011 15:11 tarihinde Mark Abraham<br>
        &lt;<a href="mailto:Mark.Abraham@anu.edu.au" target="_blank">Mark.Abraham@anu.edu.au</a> &lt;mailto:<a href="mailto:Mark.Abraham@anu.edu.au" target="_blank">Mark.Abraham@anu.edu.au</a>&gt;<br>
        &lt;mailto:<a href="mailto:Mark.Abraham@anu.edu.au" target="_blank">Mark.Abraham@anu.edu.au</a><br>
        &lt;mailto:<a href="mailto:Mark.Abraham@anu.edu.au" target="_blank">Mark.Abraham@anu.edu.au</a>&gt;&gt;&gt; yazdı:<br>
<br>
<br>
           On 1/04/2011 11:03 PM, ahmet yıldırım wrote:<br>
<br>
               Dear Dr. Mark,<br>
<br>
               I did you said but I have the same error. please look at<br>
            attached file<br>
<br>
               topol.top:<br>
<br>
               [ molecules ]<br>
               ; Compound        #mols<br>
               Protein_chain_A     1<br>
               Protein_chain_B     1<br>
               SOL               185<br>
               SOL               143<br>
               SOL             44125<br>
               TRS                1<br>
               EDO                1<br>
<br>
<br>
           OK, well maybe it doesn&#39;t like different chunks of the same<br>
        molecule<br>
           even when they&#39;re adjacent in order. Try &quot;SOL 44453&quot; instead.<br>
<br>
           Mark<br>
<br>
<br>
               01 Nisan 2011 14:41 tarihinde Mark Abraham<br>
               &lt;<a href="mailto:Mark.Abraham@anu.edu.au" target="_blank">Mark.Abraham@anu.edu.au</a> &lt;mailto:<a href="mailto:Mark.Abraham@anu.edu.au" target="_blank">Mark.Abraham@anu.edu.au</a>&gt;<br>
            &lt;mailto:<a href="mailto:Mark.Abraham@anu.edu.au" target="_blank">Mark.Abraham@anu.edu.au</a><br>
            &lt;mailto:<a href="mailto:Mark.Abraham@anu.edu.au" target="_blank">Mark.Abraham@anu.edu.au</a>&gt;&gt;&gt; yazdı:<br>
<br>
<br>
                   On 1/04/2011 10:26 PM, ahmet yıldırım wrote:<br>
<br>
                       Dear Justin,<br>
<br>
                       I have Fatal Errror:The solvent group Water is not<br>
                       continuous. I look at gmx-users mailing list<br>
            search. I<br>
                       also have the same problem.<br>
                       You<br>
                                  said:(<a href="http://lists.gromacs.org/pipermail/gmx-users/2010-January/048344.html" target="_blank">http://lists.gromacs.org/pipermail/gmx-users/2010-January/048344.html</a>)<br>
                       It is exactly what I said; you&#39;ve proven it. You have<br>
                       solvent, ligand, then<br>
                       solvent. To use genion (as the program prints out<br>
            at the<br>
                       prompt) you must have<br>
                       a *continuous* group of solvent in order to embed<br>
            ions. If<br>
                       you re-arrange the<br>
<br>
                       coordinate file and [molecules] section of the<br>
            topology,<br>
                       you can achieve this.<br>
<br>
                       How can I do the re-arrange you said? Can you<br>
            explain a<br>
                       little bit?<br>
<br>
<br>
                   You need a system topology whose molecules are<br>
            ordered such<br>
                   that all the water is contiguous. That means the<br>
            order of the<br>
                   names of molecule types in your [ molecules ] section<br>
            of your<br>
                   .top can have only one mention of water. Since the<br>
            order of<br>
                   molecules in the coordinate file must match this<br>
            order, you<br>
                   will need to physically reorder your [ molecules ]<br>
            section,<br>
                   and the chunks of molecules in your coordinate file.<br>
                   Fortunately, you don&#39;t have to renumber those atoms<br>
            in the<br>
                   coordinate file.<br>
<br>
                   Mark<br>
<br>
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               --     Ahmet YILDIRIM<br>
<br>
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<br>
        --         Ahmet YILDIRIM<br>
<br>
<br>
    --     ========================================<br>
<br>
    Justin A. Lemkul<br>
    Ph.D. Candidate<br>
    ICTAS Doctoral Scholar<br>
    MILES-IGERT Trainee<br>
    Department of Biochemistry<br>
    Virginia Tech<br>
    Blacksburg, VA<br></div>
    jalemkul[at]<a href="http://vt.edu" target="_blank">vt.edu</a> &lt;<a href="http://vt.edu" target="_blank">http://vt.edu</a>&gt; | (540) 231-9080<div><div></div><div><br>
    <a href="http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin" target="_blank">http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin</a><br>
<br>
    ========================================<br>
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-- <br>
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</div></div></blockquote><div><div></div><div>
<br>
-- <br>
========================================<br>
<br>
Justin A. Lemkul<br>
Ph.D. Candidate<br>
ICTAS Doctoral Scholar<br>
MILES-IGERT Trainee<br>
Department of Biochemistry<br>
Virginia Tech<br>
Blacksburg, VA<br>
jalemkul[at]<a href="http://vt.edu" target="_blank">vt.edu</a> | (540) 231-9080<br>
<a href="http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin" target="_blank">http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin</a><br>
<br>
========================================<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Ahmet YILDIRIM<br>