Download MendeleyStructure of a calpain Ca(2+)-binding domain reveals a novel EF-hand and Ca(2+)-induced conformational changes.
Blanchard, H., Grochulski, P., Li, Y., Arthur, J.S., Davies, P.L., Elce, J.S., Cygler, M.(1997) Nat Struct Biol 4: 532-538
- PubMed: 9228945
- DOI: https://doi.org/10.1038/nsb0797-532
- Primary Citation of Related Structures:
1AJ5, 1DVI - PubMed Abstract:
The crystal structure of a Ca(2+)-binding domain (dVI) of rat m-calpain has been determined at 2.3 A resolution, both with and without bound Ca2+. The structures reveal a unique fold incorporating five EF-hand motifs per monomer, three of which bind calcium at physiological calcium concentrations, with one showing a novel EF-hand coordination pattern. This investigation gives us a first view of the calcium-induced conformational changes, and consequently an insight into the mechanism of calcium induced activation in calpain. The crystal structures reveal a dVI homodimer which provides a preliminary model for the subunit dimerization in calpain.
Organizational Affiliation:
Biotechnology Research Institute, NRC, Montréal, Québec, Canada.
