Thank you very much for kind messages.<br>I am trying to convert a membrane system psf file for gromcas MD simulation. For I would like to use CHARMM36 for my POPC system, but I cannot find pre-equilibrium CAHRMM36 based POPC system. However, there is some for NAMD and I download the pdf and psf file hoping that it could be converted to related gromacs format.<br><br>Do you have any idea about this?<br><br>THX<br><div></div><br><pre><br>At&nbsp;2011-05-30£¬"Francesco&nbsp;Oteri"&nbsp;&lt;francesco.oteri@gmail.com&gt;&nbsp;wrote:

&gt;Topology&nbsp;file&nbsp;is&nbsp;suitable&nbsp;for&nbsp;analysis.&nbsp;I&nbsp;succesfully&nbsp;used&nbsp;the&nbsp;.top&nbsp;to&nbsp;
&gt;analyse&nbsp;hydrogen&nbsp;bond&nbsp;and&nbsp;salt-bridges.
&gt;I&nbsp;don't&nbsp;know&nbsp;if&nbsp;problems&nbsp;would&nbsp;arise&nbsp;for&nbsp;simulation.
&gt;
&gt;
&gt;Il&nbsp;29/05/2011&nbsp;22:10,&nbsp;albert&nbsp;ha&nbsp;scritto:
&gt;&gt;&nbsp;Thank&nbsp;you&nbsp;very&nbsp;much&nbsp;for&nbsp;kind&nbsp;advices.&nbsp;Here&nbsp;is&nbsp;some&nbsp;warning,&nbsp;and&nbsp;I&nbsp;
&gt;&gt;&nbsp;don't&nbsp;know&nbsp;whether&nbsp;there&nbsp;would&nbsp;be&nbsp;some&nbsp;problem&nbsp;or&nbsp;not:
&gt;&gt;
&gt;&gt;&nbsp;;&nbsp;'fake'&nbsp;gromacs&nbsp;topology&nbsp;generated&nbsp;from&nbsp;topotools.
&gt;&gt;&nbsp;;&nbsp;WARNING|&nbsp;the&nbsp;purpose&nbsp;of&nbsp;this&nbsp;topology&nbsp;is&nbsp;to&nbsp;allow&nbsp;using&nbsp;the&nbsp;|WARNING
&gt;&gt;&nbsp;;&nbsp;WARNING|&nbsp;analysis&nbsp;tools&nbsp;from&nbsp;gromacs&nbsp;for&nbsp;non&nbsp;gromacs&nbsp;data.&nbsp;|WARNING
&gt;&gt;&nbsp;;&nbsp;WARNING|&nbsp;it&nbsp;cannot&nbsp;be&nbsp;used&nbsp;for&nbsp;a&nbsp;simulation.&nbsp;|WARNING
&gt;&gt;
&gt;&gt;
&gt;&gt;
&gt;&gt;&nbsp;At&nbsp;2011-05-30£¬"Francesco&nbsp;Oteri"&lt;francesco.oteri@gmail.com&gt;&nbsp;&nbsp;wrote:
&gt;&gt;
&gt;&gt;&nbsp;&gt;Il&nbsp;29/05/2011&nbsp;21:58,&nbsp;albert&nbsp;ha&nbsp;scritto:
&gt;&gt;&nbsp;&gt;&gt;&nbsp;&nbsp;Hello:
&gt;&gt;&nbsp;&gt;&gt;&nbsp;&nbsp;I&nbsp;am&nbsp;wondering,&nbsp;is&nbsp;it&nbsp;possible&nbsp;to&nbsp;convert&nbsp;NAMD&nbsp;topol&nbsp;psf&nbsp;file&nbsp;into
&gt;&gt;&nbsp;&gt;&gt;&nbsp;&nbsp;Gromacs&nbsp;topol&nbsp;format?
&gt;&gt;&nbsp;&gt;&gt;
&gt;&gt;&nbsp;&gt;&gt;&nbsp;&nbsp;Thank&nbsp;you&nbsp;very&nbsp;much
&gt;&gt;&nbsp;&gt;
&gt;&gt;&nbsp;&gt;Hi&nbsp;albert,
&gt;&gt;&nbsp;&gt;you&nbsp;can&nbsp;try&nbsp;with&nbsp;the&nbsp;following&nbsp;commands:
&gt;&gt;&nbsp;&gt;
&gt;&gt;&nbsp;&gt;vmd&nbsp;.psf&nbsp;.pdb
&gt;&gt;&nbsp;&gt;topo&nbsp;writegmxtop&nbsp;output.top
&gt;&gt;&nbsp;&gt;
&gt;&gt;&nbsp;&gt;I&nbsp;recently&nbsp;tried&nbsp;with&nbsp;vmd1.9
&gt;&gt;&nbsp;&gt;
&gt;&gt;&nbsp;&gt;--&nbsp;
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&gt;
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</pre>