Abstract
Structural genomics projects aim to provide an experimental or computational three-dimensional model structure for all of the tractable macromolecules that are encoded by complete genomes. To this end, pilot centres worldwide are now exploring the feasibility of large-scale structure determination. Their experimental structures and computational models are expected to yield insight into the molecular function and mechanism of thousands of proteins. The pervasiveness of this information is likely to change the use of structure in molecular biology and biochemistry.
Key Points
Structural genomics aims to produce coordinates for all tractable proteins, by experimental determination of representative protein structures and computational comparative modelling of homologues.
There are many approaches to selecting targets for experimental characterization.
Structural genomics focuses on domains, rather than whole proteins or complexes.
Although enhancements to experimental technologies should allow structural genomics to scale up, most steps require optimization at present. Key experimental steps include cloning, expression and purification. These are followed by either nuclear magnetic resonance (NMR) assignment and structure determination, or by crystallization, diffraction, phasing and structure refinement.
Both NMR and X-ray crystallography will have roles in structural genomics.
Protein structure is better conserved than sequence, and therefore reveals distant evolutionary relationships that are undetectable from sequence.
Many functional inferences from structural genomics have relied on surface charge or bound ligands.
Solved structures are available in the usual manner from the Protein Data Bank (PDB); other databases list available targets at present.
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Acknowledgements
This work is supported by NIH grants and a Searle Scholarship. S.E.B. is grateful to J.-M. Chandonia, L. Lo Conte and R. Peters for critical review of the manuscript.
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Glossary
- COORDINATES
-
A set of numbers that specify the X, Y and Z positions for each atom in a protein. Together, they describe the molecular structure.
- HIS-TAG
-
A series of histidine residues fused to a protein that aids protein purification because of its strong binding to nickel columns.
- MESOPHILE
-
An organism that grows at moderate temperature.
- DYNAMIC LIGHT SCATTERING
-
A technique for determining apparent molecular size, in which laser light is shone on a solution. Its scatter corresponds to the diffusion rate and, therefore, the size of the molecules in solution.
- SYNCHROTRON
-
A device that accelerates particles of atomic size through an electric field; it is used to produce synchronous packets of particles.
- BEAMLINE AUTOMATION
-
Technologies to reduce human intervention on synchrotron beamlines, such as robots for mounting and centring crystals in the X-ray beam.
- MAD PHASING
-
(Multiple anomolous dispersion). An approach to determining the phases of a crystal structure by relying on the anomalous scattering of X-rays near the absorption edge of the atom (such as selenium). It allows determination of phase from several sets of data collected from a single crystal.
- TROSY
-
(Transverse relaxation-optimized spectroscopy). A nuclear magnetic resonance technique that reduces the deterioration of signal from large proteins. It allows large proteins to be studied in high-field magnets.
- ISOELECTRIC POINT
-
The pH at which a protein has zero net charge.
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Brenner, S. A tour of structural genomics. Nat Rev Genet 2, 801–809 (2001). https://doi.org/10.1038/35093574
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DOI: https://doi.org/10.1038/35093574
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