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Issue 27, 2018
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A new twist on sea silk: the peculiar protein ultrastructure of fan shell and pearl oyster byssus

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Abstract

Numerous mussel species produce byssal threads – tough proteinaceous fibers, which anchor mussels in aquatic habitats. Byssal threads from Mytilus species, which are comprised of modified collagen proteins – have become a veritable archetype for bio-inspired polymers due to their self-healing properties. However, threads from different species are comparatively much less understood. In particular, the byssus of Pinna nobilis comprises thousands of fine fibers utilized by humans for millennia to fashion lightweight golden fabrics known as sea silk. P. nobilis is very different from Mytilus from an ecological, morphological and evolutionary point of view and it stands to reason that the structure–function relationships of its byssus are distinct. Here, we performed compositional analysis, X-ray diffraction (XRD) and transmission electron microscopy (TEM) to investigate byssal threads of P. nobilis, as well as a closely related bivalve species (Atrina pectinata) and a distantly related one (Pinctada fucata). This comparative investigation revealed that all three threads share a similar molecular superstructure comprised of globular proteins organized helically into nanofibrils, which is completely distinct from the Mytilus thread ultrastructure, and more akin to the supramolecular organization of bacterial pili and F-actin. This unexpected discovery hints at a possible divergence in byssus evolution in Pinnidae mussels, perhaps related to selective pressures in their respective ecological niches.

Graphical abstract: A new twist on sea silk: the peculiar protein ultrastructure of fan shell and pearl oyster byssus

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Publication details

The article was received on 20 Apr 2018, accepted on 18 Jun 2018 and first published on 21 Jun 2018


Article type: Paper
DOI: 10.1039/C8SM00821C
Citation: Soft Matter, 2018,14, 5654-5664
  • Open access: Creative Commons BY license
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    A new twist on sea silk: the peculiar protein ultrastructure of fan shell and pearl oyster byssus

    D. Pasche, N. Horbelt, F. Marin, S. Motreuil, E. Macías-Sánchez, G. Falini, D. S. Hwang, P. Fratzl and M. J. Harrington, Soft Matter, 2018, 14, 5654
    DOI: 10.1039/C8SM00821C

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