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ºÓÍâÉúÃü: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2013-01-28 18:49:42
PymolÀïÃæµÄpolar contactµÄ¶¨Ò壬¶ÔÄã»òÐíÓаïÖú£¡
http://www.mail-archive.com/pymo ... e.net/msg03247.html

RE: [PyMOL] polar contact definition

Warren DeLano Mon, 23 May 2005 20:36:20 -0700

  Sergio,

We use the term "polar contacts" because, as you correctly point out, some
of the contacts shown don't meet strict hydrogen-bonding criteria.  Of
course, many macromolecular crystal structures aren't of high enough
resolution to make definitive determinations anyway...so...
With ideal geometry, PyMOL will show polar contacts out to:

set h_bond_cutoff_center, 3.6

With minimally acceptable geometry, PyMOL will show polar contacts out to

set h_bond_cutoff_edge, 3.2

These settings can be changed *before* running the detection process (dist
command mode=2 or via the menus).

Note that the hydrogen bond geometric criteria used in PyMOL was designed to
emulate that used by DSSP.

Cheers,
Warren

--
Warren L. DeLano, Ph.D.                     
Principal Scientist

.  DeLano Scientific LLC  
.  400 Oyster Point Blvd., Suite 213           
.  South San Francisco, CA 94080 USA   
.  Biz650)-872-0942 Tech650)-872-0834     
.  Fax650)-872-0273 Cell650)-346-1154
. mailto:war...@delsci.com      


> -----Original Message-----
> From: pymol-users-ad...@lists.sourceforge.net
> [ mailto:pymol-users-ad...@lists.sourceforge.net ] On Behalf Of
> Sergio E. Wong
> Sent: Monday, May 23, 2005 7:13 PM
> To: pymol-users@lists.sourceforge.net
> Subject: [PyMOL] polar contact definition
>
> Dear Pymol users:
>
> I'm using pymol to find "polar contacts".  I'm wondering
> what is the
> definition of a "polar contact".  Some of the distances are
> longer than
> expected for a hydrogen bond.  So, I'm left wondering what is
> the distance cut off employed.
>
> Thanks
>
> -Sergio
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