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Default Molecular Dynamics of Spider Dragline Silk Fiber Investigated by 2H MAS NMR.

Molecular Dynamics of Spider Dragline Silk Fiber Investigated by 2H MAS NMR.

Related Articles Molecular Dynamics of Spider Dragline Silk Fiber Investigated by 2H MAS NMR.

Biomacromolecules. 2015 Jan 25;

Authors: Shi X, Holland GP, Yarger JL


Abstract
The molecular dynamics of the proteins that comprise spider dragline silk were investigated with solid-state 2H magic angle spinning (MAS) NMR line shape and spin-lattice relaxation time (T1) analysis. The experiments were performed on 2H/13C/15N-enriched N. clavipes dragline silk fibers. The silk protein side-chain and backbone dynamics were probed for Ala-rich regions (?-sheet and 31-helical domains) in both native (dry) and supercontracted (wet) spider silk. In native (dry) silk fibers, the side-chains in all three Ala containing regions undergo similar fast methyl rotations (>109 s-1), while the backbone remains essentially static (
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