Core mutations switch monomeric protein GB1 into an intertwined tetramer.
Kirsten Frank, M., Dyda, F., Dobrodumov, A., Gronenborn, A.M.(2002) Nat Struct Biol 9: 877-885
- PubMed: 12379842 
- DOI: 10.1038/nsb854
- Primary Citation of Related Structures:  
1MPE, 1MVK - PubMed Abstract: 
The structure of a mutant immunoglobulin-binding B1 domain of streptococcal protein G (GB1), which comprises five conservative changes in hydrophobic core residues, was determined by NMR spectroscopy and X-ray crystallography. The oligomeric state and quaternary structure of the mutant protein are drastically changed from the wild type protein ...