Re: [ccp4bb] Protein aggregation and crystallization

2011-08-27 Thread Zheng Zhou
Hi, Anita If you could find a way to test the elute's activity/binding to its' substrat/cofactor, then you will learn much more about your target. If the function assay is elusive, you could try superose column (5KDa-5MKDa). Does your light scattering tell you about the estimated size and MW? Bes

Re: [ccp4bb] Methods for dehydrating crystals

2011-08-27 Thread Savvas Savvides
Dear Andrea check out: Post-crystallization treatments for improving diffraction quality of protein crystals. Heras B, Martin JL. Acta Crystallogr D Biol Crystallogr. 2005 Sep;61(Pt 9):1173-80. All the best Savvas On 26 Aug 2011, at 22:53, Andrea L Edwards wrote: > Hi all, > > What are the mos

Re: [ccp4bb] Detergents to eliminate non specific aggregations

2011-08-27 Thread Michael Thompson
Hampton makes a "Detergent Screen" that works the same way as the Additive Screen. http://hamptonresearch.com/product_detail.aspx?cid=1&sid=39&pid=31 It has 96 unique detergent reagents for crystal screening. It is a bit expensive, but if you don't want to purchase the whole kit you could ju

Re: [ccp4bb] reindexing monoclinic data

2011-08-27 Thread Edward A. Berry
Sorry for adding confusion- of course in reciprocal space beta* should be acute. The figures should have been labeled a, c not h,L. Edward A. Berry wrote: Gregory Bowman wrote: Yes, but I don't actually want to swap a and c (convention that a is shorter than c), but instead flip k and keep h a

Re: [ccp4bb] reindexing monoclinic data

2011-08-27 Thread Edward A. Berry
Gregory Bowman wrote: Yes, but I don't actually want to swap a and c (convention that a is shorter than c), but instead flip k and keep h and l the same. Incidentally, it is not immediately obvious to me why in matrix I cited below that the new l is h+l: -1 0 0 0 -1 0 1 0 1 Greg Because -a a

[ccp4bb] Detergents to eliminate non specific aggregations

2011-08-27 Thread 商元
Hi, everyone, I can get my protein complex but there are some non-specific aggregation from the NMR spectra, and chaps can improve it. So, besides chaps, is there any other detergents to be used during crystal screening? All suggestions are welcome. Thanks&Regards, Yuan