<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Joe,<div class="">Chimera does not have PDB fetch limited to a specific chain, sorry.</div><div class=""><br class=""><div class="">Depending on what you’re doing, you might want to try ChimeraX instead. It has much better performance on large systems.</div><div class=""><<a href="http://www.rbvi.ucsf.edu/chimerax/docs/user/advantages.html" class="">http://www.rbvi.ucsf.edu/chimerax/docs/user/advantages.html</a>></div><div class=""><br class=""></div><div class="">On my laptop, “open 5iv5” in ChimeraX takes only a few seconds to download the file and then show the structure:</div><div class=""><img apple-inline="yes" id="5BB5F3EF-9A7E-4999-B0E7-1237151F8A86" width="640" height="384" src="cid:62B63CFA-97D5-40FA-A2B1-CEC576909046@gateway.sonic.net" class=""></div><div class=""><br class=""></div><div class="">The ChimeraX download page lists some of the major features that are still missing:</div><div class=""><<a href="http://www.rbvi.ucsf.edu/chimerax/download.html" class="">http://www.rbvi.ucsf.edu/chimerax/download.html</a>></div><div class=""><br class=""></div><div class="">If you really only wanted that chain, however, you could just download the entire structure file directly from the PDB website (not involving Chimera), text-edit the file to only the chain of interest, and then open it in Chimera.</div><div class=""><br class=""></div><div class="">I hope this helps,</div><div class="">Elaine<br class=""><div class="">-----<br class="">Elaine C. Meng, Ph.D. <br class="">UCSF Chimera(X) team<br class="">Department of Pharmaceutical Chemistry<br class="">University of California, San Francisco<br class=""></div><br class=""><blockquote type="cite" class="">On Feb 11, 2018, at 6:21 AM, Healey, Joe <<a href="mailto:J.R.J.Healey@warwick.ac.uk" class="">J.R.J.Healey@warwick.ac.uk</a>> wrote:<br class=""><br class="">Hi again Chimera team,<br class="">I need to download a chain from an enormous macromolecular complex as it's so large it actually crashes Chimera!<br class="">Is it possible to do this directly in chimera somehow (downloading just that specific chain or chains? The fetch dialogue doesn't seem to like the typical underscore notation (e.g. 5IV5_BB )<br class="">Thanks<br class="">Joe<br class=""></blockquote><br class=""></div></div></body></html>