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---------- Forwarded message ---------- From: "Roger Rowlett" <[log in to unmask]> Date: Aug 10, 2013 12:01 PM Subject: Re: [ccp4bb] Xtal formed during purification To: "ZHIZHI WANG" <[log in to unmask]> Cc: When I worked with S. typhimurium tryptophan synthase, it would crystallize directly from the crude lysate during ammonium sulfate precipitation. IIRC the history of this protein, these little crystals diffracted as well. In fact, 2x crystallization was how we purified the enzyme. Never saw a column. Sometimes you get lucky. Roger Rowlett On Aug 9, 2013 3:42 PM, "ZHIZHI WANG" <[log in to unmask]> wrote: > Hi all, > After I purified my target protein by ion exchange, I left the > fractions with high protein concentrations overnight @4C. Now I saw a lot > of small needle crystals inside the EP tubes this morning. > I wonder whether there is any technique or method to get bigger crystals > from this? > > ZZ >