Mastoparan binding induces a structural change affecting both the N-terminal and C-terminal domains of calmodulin. A 113Cd-NMR study |
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Authors: | S Linse T Drakenberg S Forsén |
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Institution: | Physical Chemistry 2, Chemical Center, PO Box 124, 221 00 Lund, Sweden |
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Abstract: | 113Cd-NMR studies of solutions of cadmium-loaded calmodulin (Cd4CaM) and the tetradecapeptide mastoparan in different ratios show that mastoparan binds to Cd4CaM with high affinity. The off-rate of protein- bound mastoparan is found to be 40 s-1 or less. The binding of one molecule of mastoparan to Cd4CaM is observed to affect all four metal-binding sites, indicating that both the N-terminal and C-terminal globular domains of the protein undergo conformational changes. |
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