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- W2319328605 abstract "Caddisflies are aquatic relatives of silk-spinning terrestrial moths and butterflies. Casemaker larvae spin adhesive silk fibers for underwater construction of protective composite cases. The central region of Hesperophylax sp. H-fibroin contains a repeating pattern of three conserved subrepeats, all of which contain one or more (SX)n motifs with extensively phosphorylated serines. Native silk fibers were highly extensible and displayed a distinct yield point, force plateau, and load cycle hysteresis. FTIR spectroscopy of native silk showed a conformational mix of random coil, β-sheet, and turns. Exchanging multivalent ions with Na+ EDTA disrupted fiber mechanics, shifted the secondary structure ratios from antiparallel β-sheet toward random coil and turns, and caused the fibers to shorten, swell in diameter, and disrupted fiber birefringence. The EDTA effects were reversed by restoring Ca2+. Molecular dynamic simulations provided theoretical support for a hypothetical structure in which the (pSX)n motifs may assemble into two- and three-stranded, Ca2+-stabilized β-sheets." @default.
- W2319328605 created "2016-06-24" @default.
- W2319328605 creator A5020579549 @default.
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- W2319328605 creator A5042651482 @default.
- W2319328605 creator A5062098434 @default.
- W2319328605 creator A5084822815 @default.
- W2319328605 date "2013-10-03" @default.
- W2319328605 modified "2023-09-27" @default.
- W2319328605 title "Self-Tensioning Aquatic Caddisfly Silk: Ca<sup>2+</sup>-Dependent Structure, Strength, and Load Cycle Hysteresis" @default.
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- W2319328605 doi "https://doi.org/10.1021/bm401036z" @default.
- W2319328605 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24050221" @default.
- W2319328605 hasPublicationYear "2013" @default.
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