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Characterization of silk spun by the embiopteran, Antipaluria urichi

Silks are renowned for being lightweight materials with impressive mechanical properties. Though moth and spider silks have received the most study, silk production has evolved in many other arthropods. One insect group that has been little investigated is Embioptera (webspinners). Embiopterans prod...

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Published in:Insect biochemistry and molecular biology 2009-02, Vol.39 (2), p.75-82
Main Authors: Collin, Matthew A., Garb, Jessica E., Edgerly, Janice S., Hayashi, Cheryl Y.
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Language:English
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description Silks are renowned for being lightweight materials with impressive mechanical properties. Though moth and spider silks have received the most study, silk production has evolved in many other arthropods. One insect group that has been little investigated is Embioptera (webspinners). Embiopterans produce silk from unique tarsal spinning structures during all life stages. We characterize the molecular and mechanical properties of Antipaluria urichi (Embioptera) silk through multiple approaches. First, we quantify the number of silk secretory structures on their forelimbs and the tensile properties of Antipaluria silk. Second, we present silk protein (fibroin) transcripts from an embiopteran forelimb protarsomere cDNA library. We describe a fibroin that shares several features with other arthropod silks, including a subrepetitive core region, a non-repetitive carboxyl-terminal sequence, and a composition rich in glycine, alanine, and serine. Despite these shared attributes, embiopteran silk has several different tensile properties compared to previously measured silks. For example, the tensile strength of Antipaluria silk is much lower than that of Bombyx mori silk. We discuss the observed mechanical properties in relation to the fibroin sequence, spinning system, and embiopteran silk use.
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subjects amino acid composition
Amino Acid Sequence
amino acid sequences
animal anatomy
Animals
Antipaluria urichi
Araneae
Arthropoda
Base Sequence
Biomechanics
Bombyx mori
cDNA
complementary DNA
Embioptera
Fibroin
fibroins
forelimbs
Insect Proteins - chemistry
Insect Proteins - genetics
Insect Proteins - metabolism
Insecta - chemistry
Insecta - genetics
Insecta - metabolism
mechanical properties
messenger RNA
Molecular Sequence Data
nucleotide sequences
Sequence Alignment
Silk
Silk - chemistry
Silk - genetics
Silk - metabolism
Silk glands
silk proteins
Tensile Strength
Webspinner
title Characterization of silk spun by the embiopteran, Antipaluria urichi
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