Hi there, I think it is PEG, very common to have PEG in horseshoe shape with arginine pointing toward to it.
Cheers, Mirella Vivoli Mirella Associate Research Fellow Biocatalysis Centre, Henry Wellcome Building College of Life and Environmental Sciences, University of Exeter Stocker Road Exeter Ex4 4QD Tel: + 44 (0)1392 726121 Email: m.viv...@exeter.ac.uk "I don't want to believe. I want to know". [C. Sagan] ________________________________ From: CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK> on behalf of Paul Emsley <pems...@mrc-lmb.cam.ac.uk> Sent: 24 January 2017 17:32:35 To: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] Unknown electron density blob On 24/01/2017 17:19, Uma Gabale wrote: > While refining a structure at 2.5 A resolution, we observed a > semi-circular/crescent shaped > electron density blob as shown in the attached picture. We have been unable > to identify it > so far, and would appreciate any help in identification. If you have Coot: Extensions->Modelling->Add Other Solvent Molecules->Add New Residue Type->"PG4"->Add then click "PG4 Tetraethylene Glycol"
