Trimeric domain-swapped barnase.
Zegers, I., Deswarte, J., Wyns, L.(1999) Proc Natl Acad Sci U S A 96: 818-822
- PubMed: 9927651 
- DOI: https://doi.org/10.1073/pnas.96.3.818
- Primary Citation of Related Structures:  
1YVS - PubMed Abstract: 
The structure of a trimeric domain-swapped form of barnase (EC 3.1. 27.3) was determined by x-ray crystallography at a resolution of 2.2 A from crystals of space group R32. Residues 1-36 of one molecule associate with residues 41-110 from another molecule related through threefold symmetry. The resulting cyclic trimer contains three protein folds that are very similar to those in monomeric barnase. Both swapped domains contain a nucleation site for folding. The formation of a domain-swapped trimer is consistent with the description of the folding process of monomeric barnase as the formation and subsequent association of two foldons.
Organizational Affiliation: 
Laboratorium voor Ultrastructuur, Vrije Universiteit Brussel, Vlaams Interuniversitair Instituut voor Biotechnologie, Paardenstraat 65, B-1640 St. Genesius Rode, Belgium. igzegers@vub.ac.be