Spider silk colour covaries with thermal properties but not protein structure

Sean J. Blamires, Georgia Cerexhe, Thomas E. White, Marie E. Herberstein, Michael M. Kasumovic

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Understanding how and why animal secretions vary in property has important biomimetic implications as desirable properties might covary. Spider major ampullate (MA) silk, for instance, is a secretion earmarked for biomimetic applications, but many of its properties vary among and between species across environments. Here, we tested the hypothesis that MA silk colour, protein structure and thermal properties covary when protein uptake is manipulated in the spider Trichonephila plumipes. We collected silk from adult female spiders maintained on a protein-fed or protein-deprived diet. Based on spectrophotometric quantifications, we classified half the silks as 'bee visible' and the other half 'bee invisible'. Wide angle X-ray diffraction and differential scanning calorimetry were then used to assess the silk's protein structure and thermal properties, respectively. We found that although protein structures and thermal properties varied across our treatments only the thermal properties covaried with colour. This ultimately suggests that protein structure alone is not responsible for MA silk thermal properties, nor does it affect silk colours. We speculate that similar ecological factors act on silk colour and thermal properties, which should be uncovered to inform biomimetic programmes.

Original languageEnglish
Article number20190199
Pages (from-to)1-9
Number of pages9
JournalJournal of the Royal Society Interface
Volume16
Issue number156
DOIs
Publication statusPublished - Jul 2019

Keywords

  • coloration
  • differential scanning calorimetry
  • major ampullate silk
  • optical models
  • spectrophotometry
  • wide-angle X-ray diffraction

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