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Published on: May 8, 2013
Environmental conditions impinge on dragline silk protein composition.
K-H Guehrs1, B Schlott, F Grosse
1Leibniz Institute for Age Research - Fritz Lipmann Institute, Beutenbergstrasse 11, D-07745 Jena, Germany.
Insect Molecular Biology
|October 3, 2008
Summary
Orb-weaving spiders adjust silk composition under starvation, reducing major ampullate spidroin 2 (MaSp2) to lower energy costs. This produces stiffer silk, ideal for draglines, aiding survival during food scarcity.
Area of Science:
- Biochemistry
- Materials Science
- Zoology
Background:
- Orb-weaving spider silk, particularly from Nephila clavipes, is a complex material.
- This silk is primarily composed of two fibroins: major ampullate spidroin 1 (MaSp1) and major ampullate spidroin 2 (MaSp2).
- The relative proportions and roles of these fibroins in silk properties are not fully understood.
Purpose of the Study:
- To investigate the composition of silk fibroins in Nephila clavipes.
- To determine how environmental factors, such as starvation, affect silk composition.
- To understand the functional implications of altered silk composition for the spider.
Main Methods:
- Analysis of silk dope and spun filaments using proteolytic peptides.
- Utilized spidroin type-specific antibodies to quantify fibroin contributions.
- Observed changes in silk properties during induced starvation periods.
Main Results:
- Major ampullate spidroin 2 (MaSp2) is a minor component in both spinning dope and spun silk.
- Starvation leads to a decreased contribution of MaSp2 in silk.
- Silk becomes less elastic and stiffer when MaSp2 levels decrease.
- Reduced MaSp2 lowers the energy (ATP) cost of silk production.
Conclusions:
- Spiders can modify silk composition, specifically reducing MaSp2, in response to starvation.
- This adaptation produces stiffer silk suitable for draglines, enhancing survival during food scarcity.
- Altering silk protein ratios offers dual benefits: reduced production cost and improved functional properties for survival.
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