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Crystal growth: Tips and Tricks: Difference between revisions
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→I tried Hampton Screen I & II with my protein and have no crystals. What can I do?
(New page: == I tried Hampton Screen I & II with my protein and have no crystals. What can I do? == 1. There are other screens. While it is proably true that when proteins do crystalize, they in ...) |
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- [http://www.jenabioscience.com/cms/en/1/browse/632_screens.html Jena Bioscience] | - [http://www.jenabioscience.com/cms/en/1/browse/632_screens.html Jena Bioscience] | ||
- other screens see [[Crystallization screens and methods]] | |||
2. Vary protein concentration. This is rather obvious suggestion when all your drops are clear or all have precipitate, in which case your overall concentration is too low (too high). More elaborate approach is to modify concentrations based on the results of your first screen, i.e. double it for the conditions which produced clear drops and cut it in half for those which produced precipiate. To avoid concentrating/diluting protein, you can simply try to mix your original protein stock with reservoir solutions in different proportions. For instance, mixing 2ul of protein with 1ul of reservoir solution is (to some degree) equivalent of doubling protein concentration. | 2. Vary protein concentration. This is rather obvious suggestion when all your drops are clear or all have precipitate, in which case your overall concentration is too low (too high). More elaborate approach is to modify concentrations based on the results of your first screen, i.e. double it for the conditions which produced clear drops and cut it in half for those which produced precipiate. To avoid concentrating/diluting protein, you can simply try to mix your original protein stock with reservoir solutions in different proportions. For instance, mixing 2ul of protein with 1ul of reservoir solution is (to some degree) equivalent of doubling protein concentration. | ||