Dear Jacob, You may find useful this web site by Marjorie Harding about metal coordination sites in proteins http://tanna.bch.ed.ac.uk/
best regards Stefano Benini, Ph.D. Assistant Professor http://pro.unibz.it/staff2/sbenini/ **************************** Bio-organic Chemistry Laboratory Faculty of Science and Technology Free University of Bolzano Piazza Università, 5 39100 Bolzano, Italy Office (room K2.14): +39 0471 017128 Laboratory (room E.012): +39 0471 017901 Fax: +39 0471 017009 *************************** -----Original Message----- From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Jacob Keller Sent: Wednesday, 16 November, 2011 19:21 To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] Distinguish NH4 from Na? Dear Crystallographers, I have crystals containing 666mM NH4 and 540mM Na, and there appears to be a "water" which is only about 2.2 Ang from some polar atoms. It is currently reasonably happy as a Na, but is there any reasonable way to decide which cation is there? JPK -- ******************************************* Jacob Pearson Keller Northwestern University Medical Scientist Training Program email: j-kell...@northwestern.edu *******************************************
