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Koebley SR, Thorpe D, Pang P, Chrisochoides P, Greving I, Vollrath F, Schniepp HC. Silk Reconstitution Disrupts Fibroin Self-Assembly. Biomacromolecules 2015; 16:2796-804. [DOI: 10.1021/acs.biomac.5b00732] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sean R. Koebley
- The College of William & Mary, Department of Applied Science, P.O. Box 8795, Williamsburg, Virginia 23187-8795, United States
| | - Daniel Thorpe
- The College of William & Mary, Department of Applied Science, P.O. Box 8795, Williamsburg, Virginia 23187-8795, United States
| | - Pei Pang
- The College of William & Mary, Department of Applied Science, P.O. Box 8795, Williamsburg, Virginia 23187-8795, United States
| | - Panos Chrisochoides
- The College of William & Mary, Department of Applied Science, P.O. Box 8795, Williamsburg, Virginia 23187-8795, United States
| | - Imke Greving
- Oxford Silk Group, Department of Zoology, Oxford University, Tinbergen
Building, South Parks Road, Oxford, Oxfordshire OX1 3PS, United Kingdom
| | - Fritz Vollrath
- Oxford Silk Group, Department of Zoology, Oxford University, Tinbergen
Building, South Parks Road, Oxford, Oxfordshire OX1 3PS, United Kingdom
| | - Hannes C. Schniepp
- The College of William & Mary, Department of Applied Science, P.O. Box 8795, Williamsburg, Virginia 23187-8795, United States
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Suzuki Y, Takahashi R, Shimizu T, Tansho M, Yamauchi K, Williamson MP, Asakura T. Intra- and Intermolecular Effects on 1H Chemical Shifts in a Silk Model Peptide Determined by High-Field Solid State 1H NMR and Empirical Calculations. J Phys Chem B 2009; 113:9756-61. [DOI: 10.1021/jp903020p] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yu Suzuki
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan, National Institute for Material Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan, Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank Sheffield S10 2TN, U.K
| | - Rui Takahashi
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan, National Institute for Material Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan, Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank Sheffield S10 2TN, U.K
| | - Tadashi Shimizu
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan, National Institute for Material Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan, Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank Sheffield S10 2TN, U.K
| | - Masataka Tansho
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan, National Institute for Material Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan, Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank Sheffield S10 2TN, U.K
| | - Kazuo Yamauchi
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan, National Institute for Material Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan, Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank Sheffield S10 2TN, U.K
| | - Mike P. Williamson
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan, National Institute for Material Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan, Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank Sheffield S10 2TN, U.K
| | - Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo 184-8588, Japan, National Institute for Material Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan, Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank Sheffield S10 2TN, U.K
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Kameda T, Miyazawa M, Murase S. Conformation of drawn poly(trimethylene terephthalate) studied by solid-state 13C NMR. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43:21-26. [PMID: 15505813 DOI: 10.1002/mrc.1507] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The change in the conformation of the flexible O-CH2-CH2-CH2-O segment of poly(trimethylene terephthalate) (PTT) monofilament caused by drawing was investigated by means of the gamma-gauche effect on the 13C solid-state NMR chemical shift of the internal methylene carbon, combined with the NMR relaxations. The conformation around the O-CH2 and CH2-O bonds for as-spun fiber was trans/trans. On drawing, followed by heat treatment, the conformation changed to gauche/gauche. The ratio of gauche/gauche to trans/trans for the drawn PTT fiber was determined quantitatively.
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Affiliation(s)
- Tsunenori Kameda
- National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8634, Japan
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Nakazawa Y, Asakura T. Structure determination of a peptide model of the repeated helical domain in Samia cynthia ricini silk fibroin before spinning by a combination of advanced solid-state NMR methods. J Am Chem Soc 2003; 125:7230-7. [PMID: 12797796 DOI: 10.1021/ja0300721] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fibrous proteins unlike globular proteins, contain repetitive amino acid sequences, giving rise to very regular secondary protein structures. Silk fibroin from a wild silkworm, Samia cynthia ricini, consists of about 100 repeats of alternating polyalanine (poly-Ala) regions of 12-13 residues in length and Gly-rich regions. In this paper, the precise structure of the model peptide, GGAGGGYGGDGG(A)(12)GGAGDGYGAG, which is a typical repeated sequence of the silk fibroin, was determined using a combination of three kinds of solid-state NMR studies; a quantitative use of (13)C CP/MAS NMR chemical shift with conformation-dependent (13)C chemical shift contour plots, 2D spin diffusion (13)C solid-state NMR under off magic angle spinning and rotational echo double resonance. The structure of the model peptide corresponding to the silk fibroin structure before spinning was determined. The torsion angles of the central Ala residue, Ala(19), in the poly-Ala region were determined to be (phi, psi) = (-59 degrees, -48 degrees ) which are values typically associated with alpha-helical structures. However, the torsion angles of the Gly(25) residue adjacent to the C-terminal side of the poly-Ala chain were determined to be (phi, psi) = (-66 degrees, -22 degrees ) and those of Gly(12) and Ala(13) residues at the N-terminal of the poly-Ala chain to be (phi, psi) = (-70 degrees, -30 degrees ). In addition, REDOR experiments indicate that the torsion angles of the two C-terminal Ala residues, Ala(23) and Ala(24), are (phi, psi) = (-66 degrees, -22 degrees ) and those of N-terminal two Ala residues, Ala(13) and Ala(14) are (phi, psi) = (-70 degrees, -30 degrees ). Thus, the local structure of N-terminal and C-terminal residues, and also the neighboring residues of alpha-helical poly-Ala chain in the model peptide is a more strongly wound structure than found in typical alpha-helix structures.
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Affiliation(s)
- Yasumoto Nakazawa
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588 Japan
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Asakura T, Yao J. 13C CP/MAS NMR study on structural heterogeneity in Bombyx mori silk fiber and their generation by stretching. Protein Sci 2002; 11:2706-13. [PMID: 12381852 PMCID: PMC2373734 DOI: 10.1110/ps.0221702] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
It is important to resolve the structure of Bombyx mori silk fibroin before spinning (silk I) and after spinning (silk II), and the mechanism of the structural transition during fiber formation in developing new silk-like fiber. The silk I structure has been recently resolved by (13)C solid-state NMR as a "repeated beta-turn type II structure." Here, we used (13)C solid-state NMR to clarify the heterogeneous structure of the natural fiber from Bombyx mori silk fibroin in the silk II form. Interestingly, the (13)C CP/MAS NMR revealed a broad and asymmetric peak for the Ala Cbeta carbon. The relative proportions of the various heterogeneous components were determined from their relative peak intensities after line shape deconvolution. Namely, for 56% crystalline fraction (mainly repeated Ala-Gly-Ser-Gly-Ala-Gly sequences), 18% distorted beta-turn, 13% beta-sheet (parallel Ala residues), and 25% beta-sheet (alternating Ala residues). The remaining fraction of 44% amorphous Tyr-rich region, 22% in both distorted beta-turn and distorted beta-sheet. Such a heterogeneous structure including distorted beta-turn can be observed for the peptides (AG)(n) (n > 9 ). The structural change from silk I to silk II occurs exclusively for the sequence (Ala-Gly-Ser-Gly-Ala-Gly)(n) in B. mori silk fibroin. The generation of the heterogeneous structure can be studied by change in the Ala Cbeta peak of (13)C CP/MAS NMR spectra of the silk fibroin samples with different stretching ratios.
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Affiliation(s)
- Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.
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