Re: [ccp4bb] AW: [ccp4bb] off-topic: crystal optimization without buffer

2009-11-28 Thread Karthik S
crystallization experiments give you some more hints about the solubility of the protein. Good luck, Jan --- Katja Schleider *katjaschlei...@yahoo.de* schrieb am *Do, 19.11.2009: * * Von: Katja Schleider katjaschlei...@yahoo.de Betreff: [ccp4bb] off-topic: crystal optimization without

[ccp4bb] off-topic: crystal optimization without buffer

2009-11-19 Thread Katja Schleider
Hi everybody, sorry for my off-topic question. I got small initial crystals in 200mM NaSulfat and 20% PEG 3350. There is no buffer in this condition. How can I optimize these crystals? Just vary the PEG concentration?  Or should I add a buffer; or vary the pH of the buffer the proteinsolution

[ccp4bb] [Fwd: Re: [ccp4bb] off-topic: crystal optimization without buffer]

2009-11-19 Thread Vellieux Frederic
Forgot to hit the Reply all button (sorry :-( ) ---BeginMessage--- Katja Schleider wrote: Hi everybody, sorry for my off-topic question. I got small initial crystals in 200mM NaSulfat and 20% PEG 3350. There is no buffer in this condition. How can I optimize these crystals? Just vary the PEG

Re: [ccp4bb] off-topic: crystal optimization without buffer

2009-11-19 Thread natrajan
Hi Katja, Sodium sulphate forms a solution of neutral pH in water. 200 mM of Na2SO4 will buffer the crystallization solution at pH 7, in addition to acting as a salt. You could try varying the concentration of PEG and Sod.sulphate now to see if the crystals get better. Sometimes using

[ccp4bb] AW: [ccp4bb] off-topic: crystal optimization without buffer

2009-11-19 Thread Jan Schoepe
. But this might change maybe if your crystallization experiments give you some more hints about the solubility of the protein. Good luck, Jan --- Katja Schleider katjaschlei...@yahoo.de schrieb am Do, 19.11.2009: Von: Katja Schleider katjaschlei...@yahoo.de Betreff: [ccp4bb] off-topic: crystal optimization