Difficult to guess from what is visible of the protein but is this density on a two-fold axis?
Or, it could be Slimer the ghost... Cheers, Nukri Ruslan Sanishvili (Nukri), Ph.D. Macromolecular Crystallographer GM/CA@APS X-ray Science Division, ANL 9700 S. Cass Ave. Lemont, IL 60439 Tel: (630)252-0665 Fax: (630)252-0667 [email protected] ________________________________ From: CCP4 bulletin board <[email protected]> on behalf of Nick Thomas <[email protected]> Sent: Wednesday, June 14, 2017 11:39 AM To: [email protected] Subject: [ccp4bb] Unknown Ligand Density Dear CCP4bb, I am refining a structure and have come across strong electron density for an unknown ligand (image attached). Would someone be able to identify this unknown ligand that somehow was co-purified with the protein. The electron density shape does not match anything included in the crystallization conditions. The crystallization condition is 0.1M MES monohydrate, pH 6.5, 1.6 M Magnesium sulphate heptahydrate
