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Crystallization of Proteins on Chip by Microdialysis for In Situ X-ray Diffraction Studies
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In situ proteolysis for protein crystallization and structure determination
Aiping Dong1, Xiaohui Xu, Aled M Edwards
1Structural Genomics Consortium, University of Toronto, 100 College Street, Toronto, Ontario M5G 1L5, Canada.
Nature Methods
|November 6, 2007
Summary
In situ proteolysis aids protein crystallization for structure determination. This method successfully yielded structures for 9 bacterial proteins and the human AIRS domain, overcoming previous crystallization challenges.
Area of Science:
- Structural Biology
- Biochemistry
- Protein Crystallization
Background:
- Many proteins are difficult to crystallize for structural studies.
- Existing methods often fail for recalcitrant proteins.
Purpose of the Study:
- To evaluate the general applicability of in situ proteolysis for protein crystallization.
- To improve structure determination success rates for challenging proteins.
Main Methods:
- Incorporated a protease digestion step (chymotrypsin or trypsin) into crystallization trials.
- Applied the method to 55 bacterial and 14 human proteins.
- Utilized X-ray crystallography for structure determination.
Main Results:
- Successfully determined the structures of 9 bacterial proteins.
- Determined the structure of the human aminoimidazole ribonucleotide synthetase (AIRS) domain.
- Demonstrated the utility of in situ proteolysis for previously intractable proteins.
Conclusions:
- In situ proteolysis is a broadly applicable technique for overcoming protein crystallization hurdles.
- This approach enhances the ability to determine protein structures, advancing structural biology.
- The method shows promise for expanding the repertoire of solvable protein structures.
