Site-site communication in the EF-hand Ca2+-binding protein calbindin D9k.Maler, L., Blankenship, J., Rance, M., Chazin, W.J.
(2000) Nat.Struct.Mol.Biol. 7: 245-250
- PubMed: 10700285
- DOI: 10.1038/73369
- PubMed Abstract:
- Solution structure of (cd2+)1-calbindin D9k reveals details of the stepwise structural changes along the apo-(Ca2+)1-(Ca2+)2 binding pathway.
Akke, M.,Forsen, S.,Chazin, W.J.
(1995) J.Mol.Biol. 252: 102
- Characterization of the N-terminal half-saturated state of calbindin D9k: NMR studies of the N56A mutant.
Wimberly, B.,Thulin, E.,Chazin, W.J.
(1995) Protein Sci. 4: 1045
- Determination of the solution structure of apo calbindin D9k by NMR spectroscopy.
Skelton, N.J.,Kordel, J.,Chazin, W.J.
(1995) J.Mol.Biol. 249: 441
- High resolution solution structure of calcium-loaded calbindin D9k.
Kordel, J.,Skelton, N.J.,Akke, M.,Chazin, W.J.
(1993) J.Mol.Biol. 231: 711
The cooperative binding of Ca2+ ions is an essential functional property of the EF-hand family of Ca2+-binding proteins. To understand how these proteins function, it is essential to characterize intermediate binding states in addition to the apo- an ...
The cooperative binding of Ca2+ ions is an essential functional property of the EF-hand family of Ca2+-binding proteins. To understand how these proteins function, it is essential to characterize intermediate binding states in addition to the apo- and holo-proteins. The three-dimensional solution structure and fast time scale internal motional dynamics of the backbone have been determined for the half-saturated state of the N56A mutant of calbindin D9k with Ca2+ bound only in the N-terminal site. The extent of conformational reorganization and a loss of flexibility in the C-terminal EF-hand upon binding of an ion in the N-terminal EF-hand provide clear evidence of the importance of site-site interactions in this family of proteins, and demonstrates the strength of long-range effects in the cooperative EF-hand Ca2+-binding domain.
Department of Molecular Biology (MB9), The Scripps Research Institute, 10550 North Torrey Pines Road., La Jolla, California 92037, USA.