A complement to the modern crystallographer's toolbox: caged gadolinium complexes with versatile binding modes
Research output: Contribution to journal › Journal article › Research › peer-review
A set of seven caged gadolinium complexes were used as vectors for introducing the chelated Gd(3+) ion into protein crystals in order to provide strong anomalous scattering for de novo phasing. The complexes contained multidentate ligand molecules with different functional groups to provide a panel of possible interactions with the protein. An exhaustive crystallographic analysis showed them to be nondisruptive to the diffraction quality of the prepared derivative crystals, and as many as 50% of the derivatives allowed the determination of accurate phases, leading to high-quality experimental electron-density maps. At least two successful derivatives were identified for all tested proteins. Structure refinement showed that the complexes bind to the protein surface or solvent-accessible cavities, involving hydrogen bonds, electrostatic and CH-π interactions, explaining their versatile binding modes. Their high phasing power, complementary binding modes and ease of use make them highly suitable as a heavy-atom screen for high-throughput de novo structure determination, in combination with the SAD method. They can also provide a reliable tool for the development of new methods such as serial femtosecond crystallography.
|Journal||Acta crystallographica. Section D, Biological crystallography|
|Issue number||Pt 6|
|Number of pages||11|
|Publication status||Published - Jun 2014|
- Binding Sites, Crystallography, X-Ray/methods, Gadolinium/chemistry, Molecular Structure