It actually looks much like pyrophosphate! If your protein is phosphatase and the extra density is in vicinity of the active site it might be the remaining product of reaction.
Vaheh ________________________________ From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Bosch, Juergen Sent: Tuesday, July 16, 2013 11:53 AM To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] Dose anyone see this ligand before? Special position ? sulfate-size ? Jürgen On Jul 16, 2013, at 11:35 AM, Wei Feng wrote: Dear all, I found some redundant density in my structure beween two molecule. (see picture 1 and 2) But I am not sure which ligand will be. Dose everyone see this ligand before? If so, can you tell the PDB code or send me the struture file? Thank you for your time! Wei <picture1.jpg><picture2.jpg> ...................... Jürgen Bosch Johns Hopkins University Bloomberg School of Public Health Department of Biochemistry & Molecular Biology Johns Hopkins Malaria Research Institute 615 North Wolfe Street, W8708 Baltimore, MD 21205 Office: +1-410-614-4742 Lab: +1-410-614-4894 Fax: +1-410-955-2926 http://lupo.jhsph.edu To the extent this electronic communication or any of its attachments contain information that is not in the public domain, such information is considered by MedImmune to be confidential and proprietary. This communication is expected to be read and/or used only by the individual(s) for whom it is intended. If you have received this electronic communication in error, please reply to the sender advising of the error in transmission and delete the original message and any accompanying documents from your system immediately, without copying, reviewing or otherwise using them for any purpose. Thank you for your cooperation.