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- W2137427326 abstract "The crystalline fraction (Cp fraction) of silk fibroin in silk II form from the silkworm Bombyx mori is the classic example of antiparallel β-sheet and consists mainly of Ala, Ser, and Gly. In the 13C CP/MAS NMR spectrum, the Ala Cβ, Ser Cα, and Ser Cβ peaks are asymmetric, showing the heterogeneous nature of the structure, which is shown to consist of two different packing geometries, denoted domains A and B. In this work, these peaks were resolved and assigned using 2D 13C–13C homonuclear correlation NMR spectra collected with different dipolar- assisted rotational resonance (DARR) mixing times. The local structure and dynamics of serine in the Cp fraction are discussed in detail. Model peptides of the Cp fraction, [3-13C]Ser-(AGSGAG)5 with different [3-13C]Ser labeling positions, were prepared to clarify that the individual peaks of the Ser Cβ carbons come from different domains, not from different positions within a chain. The dynamics of these individual peaks were studied by measuring 13C T1 values, which provide information on serine side chain dynamics and thus on the formation of intermolecular hydrogen bonding through the Ser OH group. Moreover, cross peaks between domains A and B were observed in the Ala Cβ DARR spectrum with a long mixing time of 400 ms, indicating a close contact between the two geometries. We conclude that the crystalline region is heterogeneous, comprising two closely associated packing geometries that form separate but small domains." @default.
- W2137427326 created "2016-06-24" @default.
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- W2137427326 date "2014-06-17" @default.
- W2137427326 modified "2023-10-14" @default.
- W2137427326 title "Local Structure and Dynamics of Serine in the Heterogeneous Structure of the Crystalline Domain of <i>Bombyx mori</i> Silk Fibroin in Silk II Form Studied by 2D <sup>13</sup>C–<sup>13</sup>C Homonuclear Correlation NMR and Relaxation Time Observation" @default.
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- W2137427326 doi "https://doi.org/10.1021/ma500908m" @default.
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