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Default The influence of hydration on the conformation of bovine serum albumin studied by sol

The influence of hydration on the conformation of bovine serum albumin studied by solid-state 13C-NMR spectroscopy.

Related Articles The influence of hydration on the conformation of bovine serum albumin studied by solid-state 13C-NMR spectroscopy.

Biopolymers. 1993 Dec;33(12):1871-6

Authors: Gregory RB, Gangoda M, Gilpin RK, Su W

13C proton-decoupled cross-polarization magic-angle spinning nmr spectra of bovine serum albumin are reported as a function of hydration. Increases in hydration level enhance the resolution of the peak centered at about 40 ppm but has little or no effect on the other spectral peaks. Hydration has little effect on either the rotating frame proton spin-lattice relaxation time or the cross-relaxation time for any of the peaks, suggesting that the efficiency of dipolar coupling is largely preserved on hydration of the protein. Resolution enhancement of the peak at 40 ppm is not understood, but possible sources of the behavior include a decrease in the line width of contributing resonances from lysine epsilon carbons due to increased motional averaging on hydration, reordering of disulfide bridges, and titration shifts induced by hydration. Hydration of bovine serum albumin appears to have little effect on the distribution of conformations sampled by the protein so that the broad distribution of conformations observed in the dry state is also observed in the fully hydrated state. This is in contrast to lysozyme where significant ordering of the conformation is seen on hydration.

PMID: 8268411 [PubMed - indexed for MEDLINE]



Source: PubMed
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