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Hi Eric,</div>
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I tried the changeAtom method from your email, and it worked. Many Thanks!</div>
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BTW, regarding the color-change method, I found even if I changed the color for one atom (e.g., from white to red for Hydrogen) and saved it to a new file, when I opened the new file, the Hydrogen color was still white.<br>
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It seems chimera insists the correct color in which it believes :-)<br>
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Lei<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Eric Pettersen <pett@cgl.ucsf.edu><br>
<b>Sent:</b> Tuesday, March 30, 2021 2:19 AM<br>
<b>To:</b> Lei Qian <leiqian-temple2@outlook.com><br>
<b>Cc:</b> chimera-users@cgl.ucsf.edu BB <chimera-users@cgl.ucsf.edu><br>
<b>Subject:</b> Re: [Chimera-users] [External] Re: [External] Re: in *.gro file, chimera takes CL atom as C (in compound) and gives it wrong color</font>
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<div class="" style="word-wrap:break-word; line-break:after-white-space">Hi Lei,
<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>Your script was pretty close to correct. The problem is that Midas.open() returns a list of models (using containing only one model, but in the case of an NMR ensemble it could be
more) and Midas.write() expects to be given a single model, not a list of models. So something like:</div>
<div class=""><br class="">
</div>
<div class="">modellist = Midas.open("lig.pdb")</div>
<div class="">model = modellist[0]</div>
<div class="">...</div>
<div class="">Midas.write(model, None, out_path)</div>
<div class=""><br class="">
</div>
<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>As for changeAtom(), let's say you've selected some sp3 carbons that you want to change to sp2 nitrogen by whatever means (such as runCommand("select <i class="">something</i><span class="" style="font-style:normal">")).
You would change them (one by one) with:</span></div>
<div class=""><br class="">
</div>
<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>from BuildStructure import changeAtom</div>
<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>from chimera.selection import currentAtoms</div>
<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>for a in currentAtoms():</div>
<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>changeAtom(a, 'N', 3, 3)</div>
<div class=""><br class="">
</div>
<div class="">If the carbons had 4 bonds, you would have to delete one first.</div>
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<div class="">
<div class="">--Eric</div>
<div class=""><br class="">
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<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>Eric Pettersen</div>
<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>UCSF Computer Graphics Lab</div>
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<blockquote type="cite" class="">
<div class="">On Mar 28, 2021, at 9:54 AM, Lei Qian <<a href="mailto:leiqian-temple2@outlook.com" class="">leiqian-temple2@outlook.com</a>> wrote:</div>
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Hi Eric,<span class="x_Apple-converted-space"> </span><br class="">
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Thanks for your information! Could I ask a new question on the method you mentioned? Thanks!</div>
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In previous python scripts, I used chimera module and runCommand method to perform the regular chimera commands smoothly.<span class="x_Apple-converted-space"> </span><br class="">
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Because I am not familiar with BuildStructure.changeAtom(), I tried to write a color-change python script trial according to "Chimera Program Guide":</div>
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import Midas
<div class="">modellist = Midas.open("lig.pdb")</div>
<div class="">Midas.color('red', '@/element=F')</div>
<div class="">out_path = 'test.pdb'</div>
Midas.write(modellist, None, out_path)<br class="">
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However, this did not work.<span class="x_Apple-converted-space"> </span><br class="">
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Actually, I am not sure if I can use the above similar strategy to perform the changeAtom() method.<br class="">
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Could you please give me a hint or recommend a tutorial? Thanks!</div>
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Best,</div>
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Lei<br class="">
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<font face="Calibri, sans-serif" class="" style="font-size:11pt"><b class="">From:</b><span class="x_Apple-converted-space"> </span>Eric Pettersen <<a href="mailto:pett@cgl.ucsf.edu" class="">pett@cgl.ucsf.edu</a>><br class="">
<b class="">Sent:</b><span class="x_Apple-converted-space"> </span>Wednesday, March 24, 2021 6:42 AM<br class="">
<b class="">To:</b><span class="x_Apple-converted-space"> </span>Lei Qian <<a href="mailto:leiqian-temple2@outlook.com" class="">leiqian-temple2@outlook.com</a>><br class="">
<b class="">Cc:</b><span class="x_Apple-converted-space"> </span><a href="mailto:chimera-users@cgl.ucsf.edu" class="">chimera-users@cgl.ucsf.edu</a> BB <<a href="mailto:chimera-users@cgl.ucsf.edu" class="">chimera-users@cgl.ucsf.edu</a>><br class="">
<b class="">Subject:</b><span class="x_Apple-converted-space"> </span>Re: [Chimera-users] [External] Re: [External] Re: in *.gro file, chimera takes CL atom as C (in compound) and gives it wrong color</font>
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Hi Lei,
<div class=""><span class="x_x_Apple-tab-span" style="white-space:pre"></span>Chimera does not have a command equivalent for that function. If you know how to program in Python, you could write a Python script to call the method that Chimera is using: BuildStructure.changeAtom().
That method is in <your Chimera installation>/share/BuildStructure/__init__.py if you want to see the arguments it takes.</div>
<div class=""><span class="x_x_Apple-tab-span" style="white-space:pre"></span>Alternatively you could use ChimeraX, which does have a command equivalent ("build modify") for this. You would use Chimera to write out your .gro structures as something ChimeraX
can read (<i class="">e.g.</i> PDB) and go from there.</div>
<div class=""><br class="">
</div>
<div class="">
<div class="">--Eric</div>
<div class=""><br class="">
</div>
<div class=""><span class="x_x_Apple-tab-span" style="white-space:pre"></span>Eric Pettersen</div>
<div class=""><span class="x_x_Apple-tab-span" style="white-space:pre"></span>UCSF Computer Graphics Lab</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
<blockquote type="cite" class="">
<div class="">On Mar 22, 2021, at 7:24 PM, Lei Qian <<a href="mailto:leiqian-temple2@outlook.com" class="">leiqian-temple2@outlook.com</a>> wrote:</div>
<br class="x_x_Apple-interchange-newline">
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Hi Eric,</div>
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Thanks for your information!</div>
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I tried the command, saved this gro to pdb file, opened new pdb, and it worked! BTW, it seems chimera cannot write new gro file (It can write these four files: 'pdb', 'pqr', 'mol2' or 'sph', but not gro)</div>
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Could I ask you another question?<br class="">
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In chimera I can manually change Carbon with 4 bonds to Nitrogen with 3 bonds using Tools/StructureEditing/BuildStructure/ModifyStructure. But I cannot find corresponding command line to do the same thing in chimera tutorial. So, is it possible that we can
use command line to modify atom/element, its bonds and its geometry?<br class="">
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Thanks!</div>
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Best,</div>
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Lei<br class="">
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<font face="Calibri, sans-serif" class="" style="font-size:11pt"><b class="">From:</b><span class="x_x_Apple-converted-space"> </span>Eric Pettersen <<a href="mailto:pett@cgl.ucsf.edu" class="">pett@cgl.ucsf.edu</a>><br class="">
<b class="">Sent:</b><span class="x_x_Apple-converted-space"> </span>Tuesday, March 23, 2021 1:52 AM<br class="">
<b class="">To:</b><span class="x_x_Apple-converted-space"> </span>Lei Qian <<a href="mailto:tuk04130@temple.edu" class="">tuk04130@temple.edu</a>><br class="">
<b class="">Cc:</b><span class="x_x_Apple-converted-space"> </span><a href="mailto:chimera-users@cgl.ucsf.edu" class="">chimera-users@cgl.ucsf.edu</a><span class="x_Apple-converted-space"> </span>BB <<a href="mailto:chimera-users@cgl.ucsf.edu" class="">chimera-users@cgl.ucsf.edu</a>><br class="">
<b class="">Subject:</b><span class="x_x_Apple-converted-space"> </span>[External] Re: [Chimera-users] [External] Re: in *.gro file, chimera takes CL atom as C (in compound) and gives it wrong color</font>
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Hi Lei,
<div class=""><span class="x_x_x_Apple-tab-span" style="white-space:pre"></span>If all your chlorine atom names start with the characters "CL", you can change them all to chlorine after you open the .gro file with this command (Favorites$B"*(BCommand Line):</div>
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</div>
<div class=""><span class="x_x_x_Apple-tab-span" style="white-space:pre"></span>setattr a element Cl @CL=</div>
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<div class="">
<div class="">--Eric</div>
<div class=""><br class="">
</div>
<div class=""><span class="x_x_x_Apple-tab-span" style="white-space:pre"></span>Eric Pettersen</div>
<div class=""><span class="x_x_x_Apple-tab-span" style="white-space:pre"></span>UCSF Computer Graphics Lab</div>
</div>
<div class=""><br class="">
</div>
<div class="">
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<blockquote type="cite" class="">
<div class="">On Mar 21, 2021, at 7:54 PM, Lei Qian <<a href="mailto:tuk04130@temple.edu" class="">tuk04130@temple.edu</a>> wrote:</div>
<br class="x_x_x_Apple-interchange-newline">
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<div dir="ltr" class="">Hi Eric,
<div class="">Sorry for my late reply.</div>
<div class="">Yes you are right.</div>
<div class="">I tried it again: I made a new gro file containing only CL and K as ions, and opened it using chimera. </div>
<div class="">I found chimera colored K as violet, which is good; but it colored CL as the same color as Carbon: yellow.</div>
<div class="">Thank you again for your help!</div>
<div class="">Best,</div>
<div class="">Lei</div>
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<div class="x_x_x_gmail_quote">
<div dir="ltr" class="x_x_x_gmail_attr">On Tue, Feb 23, 2021 at 5:04 AM Eric Pettersen <<a href="mailto:pett@cgl.ucsf.edu" class="">pett@cgl.ucsf.edu</a>> wrote:<br class="">
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<div class="">Hi Lei,
<div class=""><span class="" style="white-space:pre-wrap"></span>There is no explicit indication of the chemical element type in a .gro file, so it's all guesswork. Chimera assumes that atom names that begin with any of the letters C, O, P, S, H, or N are
the corresponding single letter element type. This prevents atom names like CA and HG from being interpreted as calcium and mercury, rather than carbon and hydrogen.</div>
<div class=""><span class="" style="white-space:pre-wrap"></span>There aren't any great solutions. One option is to read in the .gro file, write it out as a .mol2 file, then edit that file to change the atom type of the CL atoms to Cl, then read that back
in. Another is to select your CL atoms and use the "Modify Structure" tab of the Build Structure tool to change their element to Cl.</div>
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<div class="">--Eric</div>
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<div class=""><span class="" style="white-space:pre-wrap"></span>Eric Pettersen</div>
<div class=""><span class="" style="white-space:pre-wrap"></span>UCSF Computer Graphics Lab</div>
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<div class="">On Feb 18, 2021, at 8:30 PM, Lei Qian <<a href="mailto:tuk04130@temple.edu" target="_blank" class="">tuk04130@temple.edu</a>> wrote:</div>
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<div class="">
<div dir="ltr" class="">Dear users,
<div class="">Could I ask a question on chimera? Thanks!</div>
<div class="">I tried to open a gro file (small compound) using chimera. Like below:</div>
<div class="">... ...</div>
<div class=""><span class="" style="font-family:Tahoma,Arial,STHeiti,SimSun; font-size:14px"> </span><font face="tahoma, sans-serif" class=""><span class="" style="font-size:14px"><span class="x_x_Apple-converted-space"> </span> 1 LIG CL 18 x.xxx </span><span class="x_x_Apple-converted-space"> </span>x.xxx <span class="" style="font-size:14px">
</span><span class="x_x_Apple-converted-space"> </span>x.xxx <br class="" style="font-size:14px">
<span class="" style="font-size:14px"> 1 LIG CL1 19 </span>x.xxx <span class="" style="font-size:14px"> <span class="x_x_Apple-converted-space"> </span></span>x.xxx <span class="" style="font-size:14px"> </span><span class="x_x_Apple-converted-space"> </span>x.xxx </font><br class="">
</div>
<div class="">... ...</div>
<div class="">Although chimera shows the CL name "CL" when the cursor is above the atom, but the CL atom color is incorrect: the same as Carbon. </div>
<div class="">I tried to change the "CL" to "BR", and the chimera shows the correct color: dark red. It seems weird to me. Could you please give me any suggestions? </div>
<div class="">Thanks!</div>
<div class="">Best,</div>
<div class="">Lei</div>
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