<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi David,<div><br></div><div> A way to see if your atom specifier is doing what you expect is to try it with the "select" select command</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>select #0:5-15@CA:20-30@CA</div><div><br></div><div>Then see if the correct atoms are selected in the graphics, or look at the status line and see if the correct number of atoms were selected. This is the technique I used to see that your atom specifier was wrong.</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Tom</div><div><br></div><div><br><div><div>On Feb 10, 2014, at 10:28 AM, Tom Goddard wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><meta http-equiv="Content-Type" content="text/html charset=windows-1252"><base href="x-msg://4/"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi David,<div><br></div><div> I tried exactly your command in Chimera 1.8 with two randomly chosen model (3pfj, 2gbp) and match worked as expected (after removing the space after "#1:" which gives an error). So to know why your case does not work we'd need the actual PDB models you are using. But without those here is my suspicion. The match doesn't move the first model because it is already aligned. You could test this by moving one model relative to the other, then try the command again (use the Active buttons in Model Panel to freeze one model, then move the other with the mouse).</div><div><br></div><div> Also the specifier "#0:5-15@CA,20-30@CA" has the wrong syntax. It should be #0:5-15@CA:20-30@CA" (with the comma replaced by a colon). The first specifier will only select the 11 CA atoms 5-15 because with the comma it says take atoms named CA and atoms named "20-30" and atoms named CA. There are no atoms named "20-30". This explains why your rmsd values don't depend on the 20-30 or 21-31 or 20-35.</div><div><br></div><div> Here is some documentation on atom specifiers</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span><a href="http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/frameatom_spec.html">http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/frameatom_spec.html</a></div><div><br></div><div>Note that the 7th example is the same kind of specifier you were attempt with two residue ranges.</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Tom</div><div><br></div><div><br></div><div><div><div>On Feb 10, 2014, at 3:08 AM, David Martin wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div lang="EN-GB" link="blue" vlink="purple" style="font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="WordSection1" style="page: WordSection1; "><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Chimera 1.8 on Windows<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">I have been trying to align (superimpose) models based on a specific conserved region. Unfortunately Chimera doesn’t seem to do what the documentation claims it does.<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">I run (example):<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">match #0:5-15@CA,20-30@CA #1: 5-15@CA,20-30@CA<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">and get an RMSD calculation (more on this below), but no movement of the model occurs. I specify ‘move true show true’ as options. Still no movement but I have a transformation matrix. Unfortunately this is not in a form that can be understood by Transform Coordinates.<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">How do I persuade my structures to superimpose on the specific atoms?<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">The RMSD calculation appears to be broken. If I take the command<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">rmsd #0:5-15@CA,20-30@CA #1: 5-15@CA,20-30@CA<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">then I will get a number<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">If I then run<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">rmsd #0:5-15@CA,20-30@CA #1: 5-15@CA,21-31@CA<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">I get exactly the same number. In fact, if I specify atom sets of different sizes (as long as it is not the first block) then I continue to get exactly the same number<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">rmsd #0:5-15@CA,20-30@CA #1: 5-15@CA,20-35@CA<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">This should fail but doesn’t<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Have I completely misunderstood what Chimera should be doing here?<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">..d<o:p></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p></o:p></div></div><br><span style="font-size: 10pt; ">The University of Dundee is a registered Scottish Charity, No: SC015096</span><span class="Apple-converted-space"> </span>_______________________________________________<br>Chimera-users mailing list<br><a href="mailto:Chimera-users@cgl.ucsf.edu" style="color: purple; text-decoration: underline; ">Chimera-users@cgl.ucsf.edu</a><br><a href="http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users" style="color: purple; text-decoration: underline; ">http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users</a><br></div></blockquote></div><br></div></div></blockquote></div><br></div></body></html>