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Designed protein G core variants fold to native-like structures: sequence selection by ORBIT tolerates variation in
1Howard Hughes Medical Institute, California Institute of Technology, Pasadena, California 91125, USA.
Protein Science : a Publication of the Protein Society
|March 27, 2001
Summary
Computational protein design using the ORBIT package successfully created new G beta 1 variants. These proteins folded to their intended structures, demonstrating the algorithm's effectiveness even with backbone modifications.
Area of Science:
- Protein engineering and computational biology.
- Structural biology and biophysics.
Background:
- The G beta 1 domain of streptococcal protein G is a model system for protein folding studies.
- Computational protein design aims to create novel proteins with specific structures and functions.
Purpose of the Study:
- To evaluate the robustness of the ORBIT protein design package.
- To assess sequence selection accuracy under backbone perturbations.
- To determine if designed proteins fold to target structures despite modifications.
Main Methods:
- Solution structure determination using 1H Nuclear Magnetic Resonance (NMR) spectroscopy.
- Computational design of G beta 1 variants using the ORBIT package.
- Analysis of protein backbone and side-chain conformations.
Main Results:
- Two computationally designed G beta 1 variants were structurally characterized.
- Both variants adopted backbone structures similar to their intended folds.
- The ORBIT algorithm accurately predicted core side-chain angles, demonstrating its efficacy.
- A larger backbone perturbation in one variant led to conformational heterogeneity and dynamic behavior.
Conclusions:
- The ORBIT package can design protein sequences that fold specifically to target geometries.
- The design algorithm is robust to moderate changes in protein backbone specification.
- Significant backbone perturbations can introduce undesired dynamic properties into designed proteins.