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Title: Structural hysteresis in dragline spider silks induced by supercontraction: an X-ray fiber micro-diffraction study

Journal Article · · RSC Adv.
DOI:https://doi.org/10.1039/C4RA13936D· OSTI ID:1168489
 [1];  [2]
  1. Univ. of Wisconsin-Milwaukee, WI (United States). Dept. of Physics; Arizona State Univ., Tempe, AZ (United States). Dept. of Chemistry and Biochemistry
  2. Arizona State Univ., Tempe, AZ (United States). Dept. of Chemistry and Biochemistry

Interaction with water causes shrinkage and significant changes in the structure of spider dragline silks, which has been referred to as supercontraction in the literature. Preferred orientation or alignment of protein chains with respect to the fiber axis is extensively changed during this supercontraction process. Synchrotron X-ray micro-fiber diffraction experiments have been performed on Nephila clavipes and Argiope aurantia major and minor ampullate dragline spider fibers in the native dry, contracted (by immersion in water) and restretched (from contracted) states. Changes in the orientation of β-sheet nanocrystallites and the oriented component of the amorphous network have been determined from wide-angle X-ray diffraction patterns. While both the crystalline and amorphous components lose preferred orientation on wetting with water, the nano-crystallites regain their orientation on wet-restretching, whereas the oriented amorphous components only partially regain their orientation. Dragline major ampullate silks in both the species contract more than their minor ampullate silks.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOD; National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; SC0004791
OSTI ID:
1168489
Journal Information:
RSC Adv., Vol. 5, Issue (2) ; 2015
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (5)

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Phase transitions as intermediate steps in the formation of molecularly engineered protein fibers journal July 2018
The transcriptome of Darwin’s bark spider silk glands predicts proteins contributing to dragline silk toughness journal July 2019
Effect of stress on the molecular structure and mechanical properties of supercontracted spider dragline silks journal January 2020
Using hydrodynamic focusing to predictably alter the diameter of synthetic silk fibers journal April 2018