Hello, you seem to have positive difference density for the Cys sulphur/sulfur atom. It would be worth checking it's occupancy.
Best wishes, Jon Cooper. jon.b.coo...@protonmail.com Sent from Proton Mail mobile -------- Original Message -------- On 18 Dec 2023, 17:03, Liliana Margent wrote: > Hi there, We’ve been having an issue in trying to clear regions of Fo-Fc > density from a few cysteines during the refinement process. We were wondering > if anyone had seen something similar so they could offer some insight on the > likely chemistry at hand, and a potential refinement solution. Attached are > two images of the observed extra density at two cysteines, 505 and 518. We > have modeled acetylated cysteine, s-hydroxycysteine, and s-mercaptocysteine > but it does not solve the density. The protein in question is a Protein > Tyrosine Phosphatase known as STEP (PTPN5), with data collected to a > resolution of 1.79 Å. The crystals were grown in bis-tris pH 6.65, 200mM > Li2SO4, ~30% PEG3350. Of note, prior to data collection the crystal was > conserved at room temp for long time where it dried, and was subsequently > rehydrated with mother liquor. Thank you so much. > > --------------------------------------------------------------- > > To unsubscribe from the CCP4BB list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a mailing list hosted by www.jiscmail.ac.uk, terms & conditions are available at https://www.jiscmail.ac.uk/policyandsecurity/
