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The hydration response of poly(L-lysine) dynamics measured by 13C-nmr spectroscopy

โœ Scribed by Scott D. Swanson; Robert G. Bryant

Publisher
Wiley (John Wiley & Sons)
Year
1991
Tongue
English
Weight
552 KB
Volume
31
Category
Article
ISSN
0006-3525

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โœฆ Synopsis

SYNOPSIS

'.'C-nmr measurements are reported for samples of poly (L-lysine) both static and spinning a t the magic angle in the @-sheet form as a function of water content. T h e addition of water decreases the side-chain line widths considerably. Measurements of the cross-polarization time constants indicate that hydration by either H 2 0 or D 2 0 increases the time constant. Measurements of spin-lattice relaxation times in the laboratory frame and the rotating frame indicate t h a t hydration does not change the dynamics of the backbone carbon atoms in the P-sheet structure appreciably, but the side-chain atoms experience considerable increase in local mobility with increasing hydration. Deuteration of the exchangeable protons or the water has only small effects on the carbon relaxation times, indicating t h a t relaxation is driven by intramolecular dipole-dipole interactions.

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