Influence of CO2 on the micro-structural properties of spider dragline silk:: X-ray microdiffraction results

被引:16
|
作者
Riekel, C
Rössle, M
Sapede, D
Vollrath, F
机构
[1] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[2] Univ Oxford, Dept Zool, Oxford OX1 3PS, England
基金
英国工程与自然科学研究理事会;
关键词
D O I
10.1007/s00114-003-0482-8
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The mechanical properties of spider dragline fibres are altered by CO2 exposure under anaesthetizing conditions during the spinning process. In order to relate these macroscopic changes to a microscopic model, the extrusion of dragline silk was studied by synchrotron radiation microdiffraction. A brief exposure of a female Nephila senigalensis spider to CO2 results after an incubation time of less than 7 min in the extrusion of a thread (two fibres) swollen with water. The data are interpreted for a model of crystalline beta-sheet domains containing nanofibrils, which reinforce a network of protein chains. The protein network absorbs water, leaving the nanofibrils unaffected. A continuous flow of CO2 results in a co-extrusion of a dragline thread and an isotropic silk fraction, which probably has a glycine-rich sequence. Long CO2 exposure reduces the axial alignment of nanofibrils, presumably due to a partial destruction of the amorphous network.
引用
收藏
页码:30 / 33
页数:4
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