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1H-NMR studies of calmodulin.
- Source :
-
European Journal of Biochemistry . 2/15/84, Vol. 139 Issue 1, p109-114. 6p. - Publication Year :
- 1984
-
Abstract
- Using assignments of resonances in the 1H NMR spectrum of calmodulin obtained by the use of large tryptic fragments of the molecule [Dalgarno, D. C., Klevit, R. E., Levine, B. A., Williams, R. J. P., Dobrowolski, Z., and Drabikowski, W. (1984) Eur. J. Biochem. 138, 281–289], the spectral changes which occur on Ca2+ binding to calmodulin have been examined in detail. Ca2+ binding occurs in two stages: the first two Ca2+ ions bind at sites III and IV (numbered from the N terminus) and the second two Ca2+ ions bind at sites I and II. The high-affinity binding causes perturbations of residues in both halves of the molecule, whereas binding at the two N-terminal sites only affects sidechains in that half of the molecule. The effects of binding Cd2+ to the Ca2+-binding sites of calmodulin have also been studied by 1H NMR. The cation induces spectral changes which are very similar to those seen for Ca2+, but some important differences do exist. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00142956
- Volume :
- 139
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- European Journal of Biochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 13868177
- Full Text :
- https://doi.org/10.1111/j.1432-1033.1984.tb07983.x