Hi Ben, I do not have it installed myself, but after you download APBS source from github and compile it, I am guessing there will be a bin subdirectory somewhere in the resulting files with a file named apbs inside of it, and that that file [..whatever...]/bin/apbs would be the executable file. The manual page for the Chimera APBS tool includes a link to the APBS GitHub: <https://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/apbs/apbs.html> If it's too difficult to figure out, I recommend not using the Chimera APBS tool and instead just using the APBS web server directly, from here: <https://server.poissonboltzmann.org/> After running the server, you can open the resulting ESP file (.dx file) in Chimera and use it for coloring the molecular surface. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

On Jan 11, 2021, at 8:00 PM, mailman-bounces@cgl.ucsf.edu wrote:

From: benjamintam <benjamintam@um.edu.mo> Subject: APBS Date: January 11, 2021 at 7:28:44 PM PST To: Chimera-users <chimera-users-bounces@cgl.ucsf.edu>

Dear All, I can see that we have to run the APBS locally, however, which default execute file that I need to select in the Chimera in order to run APBS? Best, Ben