Re: [ccp4bb] speeding crystallisation

2007-08-06 Thread artem
Hi, Temperature is one obvious factor that comes to mind. If you have access to MS, you could check the protein from the crystallization drops - find out if there's something 'chemical' going on such as proteolysis, modification of some sort, etc. - this has happened to me once before, the

Re: [ccp4bb] speeding crystallisation

2007-08-06 Thread David J. Schuller
On Mon, 2007-08-06 at 15:50 -0400, Neeraj wrote: hi all, I am working on a protein for which we get nicely diffracting crystals but the problem is that the crystals grow from anywhere between 4-6 months. Does anyone has any general suggestions as to what things can be changed or

Re: [ccp4bb] speeding crystallisation

2007-08-06 Thread Christian Biertumpfel
Hi Neeraj, There are several ways to approach this problem. Of course, this also depends on your sample and the amount you have available. 1. Probably the first thing to try is seeding (streak or micro). 2. You could try with higher protein and/or precipitant concentration. 3. If you have enough

Re: [ccp4bb] speeding crystallisation

2007-08-06 Thread Zhen Zhang
Hi Neeraj, Two more tricks: 1. Open the cover slip a bit to allow for faster evaporation. It worked well on one of my proteins. 2. in-situ proteolysis: Acta Crystallograph Sect F Struct Biol Cryst Commun. 2006 Oct 1;62(Pt 10):1041-5. Good luck. Zhen Quoting Neeraj [EMAIL PROTECTED]: hi all,