Crystal structure of an ancient protein: evolution by conformational epistasis
Ortlund, E.A., Bridgham, J.T., Redinbo, M.R., Thornton, J.W.(2007) Science 317: 1544-1548
- PubMed: 17702911 
- DOI: 10.1126/science.1142819
- Primary Citation of Related Structures:  
2Q1H, 2Q1V, 2Q3Y - PubMed Abstract: 
The structural mechanisms by which proteins have evolved new functions are known only indirectly. We report x-ray crystal structures of a resurrected ancestral protein-the approximately 450 million-year-old precursor of vertebrate glucocorticoid (GR) and mineralocorticoid (MR) receptors ...