Sounds to me like an artifact of the two-fold (I think there must be one between the two atoms if it is the same residue?). I think things get dicey near the symmetry axes...
JPK On Tue, Jun 28, 2011 at 6:25 PM, Alexander U. Singer <alexander.sin...@utoronto.ca> wrote: > Hi -- I have a case in which I have a refined structure in which the > 'so-far' measured distance between the Se atom of a selenomethionine and its > crystallographic neighbouring Se atom (same residue) is 2.9 A, and I see > continuous density between the two atoms. Has anyone subscribing to this > newsgroup come across a case in which methionine S atoms and/or > selenomethionine Se atoms form disulfide/diselenide bonds in the crystal, > and what does that mean in terms of its possible presence biologically? > > Thanks for your help > > Alex > > -- > Dr. Alex Singer > C.H. Best Institute > 112 College St. Room 70 > University of Toronto > Toronto, Canada, M5G 1L6 > 416-978-4033 > -- ******************************************* Jacob Pearson Keller Northwestern University Medical Scientist Training Program cel: 773.608.9185 email: j-kell...@northwestern.edu *******************************************
