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K Seamon 《Biochemical and biophysical research communications》1979,86(4):1256-1265
The 250MHz NMR spectrum of the brain Ca2+-dependent regulator protein was examined in the absence of cations and in the presence of Ca2+ or Mg2+. The Ca2+-saturated regulator protein and Mg2+-saturated regulator protein exhibited several spectral differences in the aromatic and aliphatic regions of their spectra. Certain spectral changes observed to occur upon addition of metal ions are qualitatively similar to those which have been observed in the spectrum of skeletal troponin-C. These results suggest that the large sequence homology between skeletal troponin-C and the regulator protein results in similar conformational changes due to the binding of Ca2+ or Mg2+. 相似文献
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