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as it appears to bear near the guanidine group of an arginine, I would suggest it is a partially occupied and disordered sulphate and/or phosphate. whether this is practically modellable is another matter, a sulphate at occ. 0.5 is an option, or putting a water with a remark in the pdb that this water is really modelling partially occupied and disordered sulphate and/or phosphate. Mark Quoting Katja Schleider <[log in to unmask]>: > Dear all, > > I found some fairly substantial density in the active site of my > protein structure. But I don´t know what it should be. My > crystallisation condition consists of lithium sulfate, > citrate-phosphate and peg1000. The whole lot doesn't make a dashed > bit of sense! Any suggestions to fill this density with something? > Picture is attached. > > Thanks a lot, > > Katja > > > __________________________________________________ > Do You Yahoo!? > Sie sind Spam leid? Yahoo! Mail verfügt über einen herausragenden > Schutz gegen Massenmails. > http://mail.yahoo.com