Download MendeleyX-ray crystal structure of C3d: a C3 fragment and ligand for complement receptor 2.
Nagar, B., Jones, R.G., Diefenbach, R.J., Isenman, D.E., Rini, J.M.(1998) Science 280: 1277-1281
- PubMed: 9596584
- DOI: https://doi.org/10.1126/science.280.5367.1277
- Primary Citation of Related Structures:
1C3D - PubMed Abstract:
Activation and covalent attachment of complement component C3 to pathogens is the key step in complement-mediated host defense. Additionally, the antigen-bound C3d fragment interacts with complement receptor 2 (CR2; also known as CD21) on B cells and thereby contributes to the initiation of an acquired humoral response. The x-ray crystal structure of human C3d solved at 2.0 angstroms resolution reveals an alpha-alpha barrel with the residues responsible for thioester formation and covalent attachment at one end and an acidic pocket at the other. The structure supports a model whereby the transition of native C3 to its functionally active state involves the disruption of a complementary domain interface and provides insight into the basis for the interaction between C3d and CR2.
Organizational Affiliation:
Department of Biochemistry and Department of Molecular and Medical Genetics, University of Toronto, Toronto, Ontario, M5S 1A8, Canada.
