Download MendeleyDesign of three-dimensional domain-swapped dimers and fibrous oligomers.
Ogihara, N.L., Ghirlanda, G., Bryson, J.W., Gingery, M., DeGrado, W.F., Eisenberg, D.(2001) Proc Natl Acad Sci U S A 98: 1404-1409
- PubMed: 11171963
- DOI: https://doi.org/10.1073/pnas.98.4.1404
- Primary Citation of Related Structures:
1G6U - PubMed Abstract:
Three-dimensional (3D) domain-swapped proteins are intermolecularly folded analogs of monomeric proteins; both are stabilized by the identical interactions, but the individual domains interact intramolecularly in monomeric proteins, whereas they form intermolecular interactions in 3D domain-swapped structures. The structures and conditions of formation of several domain-swapped dimers and trimers are known, but the formation of higher order 3D domain-swapped oligomers has been less thoroughly studied. Here we contrast the structural consequences of domain swapping from two designed three-helix bundles: one with an up-down-up topology, and the other with an up-down-down topology. The up-down-up topology gives rise to a domain-swapped dimer whose structure has been determined to 1.5 A resolution by x-ray crystallography. In contrast, the domain-swapped protein with an up-down-down topology forms fibrils as shown by electron microscopy and dynamic light scattering. This demonstrates that design principles can predict the oligomeric state of 3D domain-swapped molecules, which should aid in the design of domain-swapped proteins and biomaterials.
Organizational Affiliation:
UCLA-DOE Laboratory of Structural Biology and the Department of Chemistry and Biochemistry, P.O. Box 951570, University of California, Los Angeles, CA 90095-1570, USA.
