Download MendeleyCalcium-induced conformational transition revealed by the solution structure of apo calmodulin.
Zhang, M., Tanaka, T., Ikura, M.(1995) Nat Struct Biol 2: 758-767
- PubMed: 7552747
- DOI: https://doi.org/10.1038/nsb0995-758
- Primary Citation of Related Structures:
1DMO - PubMed Abstract:
The solution structure of Ca(2+)-free calmodulin has been determined by NMR spectroscopy, and is compared to the previously reported structure of the Ca(2+)-saturated form. The removal of Ca2+ causes the interhelical angles of four EF-hand motifs to increase by 36 degrees-44 degrees. This leads to major changes in surface properties, including the closure of the deep hydrophobic cavity essential for target protein recognition. Concerted movements of helices A and D with respect to B and C, and of helices E and H with respect to F and G are likely responsible for the cooperative Ca(2+)-binding property observed between two adjacent EF-hand sites in the amino- and carboxy-terminal domains.
Organizational Affiliation:
Division of Molecular and Structural Biology, Ontario Cancer Institute, University of Toronto, Canada.
