Mark,

   Coloring by partial charge should work fine, provided that you supply 
partial charges to PyMOL...which isn't trivial.  You could either assign them 
using the 'alter' command after loading a PDB or SDF file, or you could convert 
your molecule into a Chemical Python "model" object, assign them via Python, 
and then load the model back into PyMOL.

   Coloring by electrostatic potential is something I am hoping to get into 
version 1.0...but PyMOL's current support for it is weak to non-existent.

Cheers,
Warren


> -----Original Message-----
> From: Mark Wall [mailto:mw...@diversa.com]
> Sent: Thursday, October 24, 2002 12:25 PM
> To: pymol-users@lists.sourceforge.net
> Subject: [PyMOL] color by partial charge? (electrostatics)
> 
> 
> Hello,
> 
> 
> Background
>    I want to create a surface colored by electrostatic 
> potential in PyMOL.  
>    I can simulate this by coloring atoms by a formal charge which is 
>    either 1, 0 or -1, ...
> 
>    color white
>    color blue, (fc; > 0.5)
>    color red, (fc; < -0.5)
>    show surface
> 
>    Of course this does not look like a surface colored by 
> Poisson-Boltzmann 
>    calculated potentials
> 
> Questions
>    1. Can I color atoms by partial_charge? (this did not seem 
> to work for
> me)
>    2. Is there a better way using only PyMOL to approximate 
> P-B calculated
>        potentials?
> 
> 
> Thanks,
> Mark
> 
> 
> 
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