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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">Hello,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">I would like to simulate a proteína in urea, using Gromacs. I have tried to use the box included in Gromacs by default (urea+h2o.gro and urea.itp). <o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">The topology of the urea/water-solvated protein is:<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><o:p></o:p></FONT></FONT></FONT></SPAN></P><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">; Include forcefield parameters<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">#include "ffG43a2.itp"<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3></FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">#include "protein.itp"</FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><o:p></o:p></FONT></FONT></FONT></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3></FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">; Include Position restraint file<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">#ifdef POSRES<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">#include "posre.itp"<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">#endif<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">; Include water and urea topology<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">#include "urea.itp"<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">#include "spc.itp"<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">#ifdef POSRES_WATER<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">; Position restraint for each water oxygen<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">[ position_restraints ]<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">;<SPAN style="mso-spacerun: yes"> </SPAN>i funct<SPAN style="mso-spacerun: yes"> </SPAN><SPAN style="mso-spacerun: yes"> </SPAN>fcx<SPAN style="mso-spacerun: yes"> </SPAN>fcy<SPAN style="mso-spacerun: yes"> </SPAN>fcz<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"> </SPAN>1<SPAN style="mso-spacerun: yes"> </SPAN>1<SPAN style="mso-spacerun: yes"> </SPAN>1000<SPAN style="mso-spacerun: yes"> </SPAN>1000<SPAN style="mso-spacerun: yes"> </SPAN>1000<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">#endif<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">[ system ]<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">; Name<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">Protein in water/urea<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">[ molecules ]<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">; Compound<SPAN style="mso-spacerun: yes"> </SPAN>#mols<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">Protein<SPAN style="mso-spacerun: yes"> </SPAN>1<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">UREA<SPAN style="mso-spacerun: yes"> </SPAN>426<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">SOL<SPAN style="mso-spacerun: yes"> </SPAN>5885<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> W</FONT></o:p></SPAN><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">hen I try<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"> </SPAN>grompp -f min.mdp -c solvated_urea.gro -p solvated.top -o min.tpr<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">I get these errors:<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">ERROR 1 [file solvated.top, line 39]:<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"> </SPAN>atom C1 (Res UREA-1) has mass 0<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">ERROR 2 [file solvated.top, line 39]:<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"> </SPAN>atom O2 (Res UREA-1) has mass 0<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">ERROR 3 [file solvated.top, line 39]:<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"> </SPAN>atom N3 (Res UREA-1) has mass 0<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">ERROR 4 [file solvated.top, line 39]:<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"> </SPAN>atom H4 (Res UREA-1) has mass 0<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">ERROR 5 [file solvated.top, line 39]:<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"> </SPAN>atom H5 (Res UREA-1) has mass 0<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">ERROR 6 [file solvated.top, line 39]:<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"> </SPAN>atom N6 (Res UREA-1) has mass 0<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">ERROR 7 [file solvated.top, line 39]:<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"> </SPAN>atom H7 (Res UREA-1) has mass 0<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">ERROR 8 [file solvated.top, line 39]:<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman"><SPAN style="mso-spacerun: yes"> </SPAN>atom H8 (Res UREA-1) has mass 0<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">Which force field does this urea.itp correspond to? Where should it look for the atomtypes of urea?</FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><FONT size=3><FONT color=#000000><FONT face="Times New Roman">Thank you very much for your help,<o:p></o:p></FONT></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-GB style="mso-ansi-language: EN-GB"><o:p><FONT face="Times New Roman" color=#000000 size=3> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT face="Times New Roman" color=#000000 size=3>Rebeca Garcia</FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT face="Times New Roman" color=#000000 size=3>Parc Cientific de Barcelona</FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT face="Times New Roman" color=#000000 size=3>regafan@hotmail.com</FONT></P><RTE_TEXT></RTE_TEXT><br /><hr />¿Aún no tienes Internet Explorer 7? Bájatelo y <a href='http://vivelive.com/ieak7/' target='_new'>consigue un regalo gratis</a></body>
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