Effects of β-sheet crystals and a glycine-rich matrix on the thermal conductivity of spider dragline silk

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• 作者：Jinju Park^a ; ¹ ; Duckjong Kim^b ; ¹ ; Seung-Mo Lee^b ; ^c ; Ji-ung Choi^d ; Myungil You^a ; Hye-Mi So^b ; Junkyu Han^a ; Junghyo Nah^e ; Jae Hun Seol^a ; ^{jhseol@gist.ac.kr}
• 关键词：Spider dragline silk ; Thermal conductivity ; Measurement ; β-Sheet crystal ; Glycine-rich matrix
• 刊名：International Journal of Biological Macromolecules
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：96
• 期：Complete
• 页码：384-391
• 全文大小：1951 K
• 卷排序：96

文摘

We measured the thermal conductivity of Araneus ventricosus’ spider dragline silk using a suspended microdevice. The thermal conductivity of the silk fiber was approximately 0.4 Wm−1 K−1 at room temperature and gradually increased with an increasing temperature in a manner similar to that of other disordered crystals or proteins. In order to elucidate the effect of β-sheet crystals in the silk, thermal denaturation was used to reduce the quantity of the β-sheet crystals. A calculation with an effective medium approximation supported this measurement result showing that the thermal conductivity of β-sheet crystals had an insignificant effect on the thermal conductivity of SDS. Additionally, the enhancement of bonding strength in a glycine-rich matrix by atomic layer deposition did not increase the thermal conductivity. Thus, this study suggests that the disordered part of the glycine-rich matrix prevented the peptide chains from being coaxially extended via the cross-linking covalent bonds.