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Hi Greg,

You can use pdb2pqr/propKa (http://pdb2pqr.sourceforge.net/) to generate
a coordinates file with the atom radii in the "occupancy" column and the
partial charge in the "B-factor" column. You can ask for different pHs
(if using the appropriate force-field)

Whith this modified pdb you can run Apbs (http://apbs.sourceforge.net/)
and get an electrostatic potential map.

Chimera (http://www.cgl.ucsf.edu/chimera/) or pymol
(http://www.pymol.org) can read the apbs maps in ".dx" format and map
them onto the surface.

HTH,


Miguel

Snyder, Greg (NIH/NIAID) [F] wrote:
> Greetings,
> 
>  
> 
> Is anyone aware of a program that can calculate, list residues and
> display the surface charges for a structure coordinate file at various
> pH  5.0, 7.4 or 9.0, similar to GRASP?
> 
>  
> 
> Thanks in advance for your comments.
> 
> Greg Snyder
> 
> [EMAIL PROTECTED]
> 
>  
> 

- --
Miguel Ortiz Lombardía
Centro de Investigaciones Oncológicas
C/ Melchor Fernández Almagro, 3
28029 Madrid, Spain
Tel. +34 912 246 900
Fax. +34 912 246 976
email: [EMAIL PROTECTED]
www: http://www.ysbl.york.ac.uk/~mol/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Je suis de la mauvaise herbe,
Braves gens, braves gens,
Je pousse en liberté
Dans les jardins mal fréquentés!
                                                       Georges Brassens
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