Have you tried sodium? From: CCP4 bulletin board <[email protected]> On Behalf Of Arpita Goswami Sent: Sunday, December 17, 2023 11:47 PM To: [email protected] Subject: [ccp4bb] Query on density fitting to phosphate
Dear All, Hope you all are doing well. The density in the image (in link below) is fitted with PO4 ion, although the crystallization condition has both mono and dihydrogen phosphate which is not fitting without hydrogen. But the resolution is 2.5 A, so hydrogen may not be put in, or is there any way to do so? Otherwise placing water is the final option. https://i.postimg.cc/4N7q2K0p/Screenshot-from-2023-12-17-16-07-07.png Also the density is quite close to Aspartate, so PO4 may not be right. Can it be dihydrogen phosphate as two positively charged residues (Specially the lysine) are also nearby to neutralize positive charge? Other ions in the crystallization condition are Cl-, K+ and Na+. These are not put as both aspartate and lysine are at comparable distances from the density. The pH is 6.2 in which dihydrogen phosphate is reported to interact with aspartate (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5855859/). Waiting eagerly for your reply. -- Thanks and Merry Christmas in advance. Best Regards, Arpita ________________________________ 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/
