Hi, It's pdb2pqr problem (unknown residue). I guess you ran pdb2pqr prior to running APBS, if not, you should. So, you should submit your question to either the APBS or pdb2pqr BB's. They are very helpful people.
Cheers, Boaz Boaz Shaanan, Ph.D. Dept. of Life Sciences Ben-Gurion University of the Negev Beer-Sheva 84105 Israel E-mail: bshaa...@bgu.ac.il Phone: 972-8-647-2220 Skype: boaz.shaanan Fax: 972-8-647-2992 or 972-8-646-1710 ________________________________________ From: CCP4 bulletin board [CCP4BB@JISCMAIL.AC.UK] on behalf of Xiaoming Ren [xiaomingre...@gmail.com] Sent: Thursday, April 24, 2014 10:32 PM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] How to create electrostatic surface of modified DNA by APBS? Dear all: I'm having a problem create the electrostatic surface for a DNA chain containing several modified nucleotides. APBS could not identify those residues and reported them as unassigned. What should I do to solve this problem? Thanks a lot and best, Xiaoming