A novel marine silk
The discovery of a novel silk production system in a marine amphipod provides insights into the wider potential of natural silks. The tube-building corophioid amphipod Crassicorophium bonellii produces from its legs fibrous, adhesive underwater threads that combine barnacle cement biology with aspects of spider silk thread extrusion spinning. We characterised the filamentous silk as a mixture of mucopolysaccharides and protein deriving from glands representing two distinct types. The carbohydrate and protein silk secretion is dominated by complex β-sheet structures and a high content of charged amino acid residues. The filamentous secretion product exits the gland through a pore near the tip of the secretory leg after having moved through a duct, which subdivides into several small ductules all terminating in a spindle-shaped chamber. This chamber communicates with the exterior and may be considered the silk reservoir and processing/mixing space, in which the silk is mechanically and potentially chemically altered and becomes fibrous. We assert that further study of this probably independently evolved, marine arthropod silk processing and secretion system can provide not only important insights into the more complex arachnid and insect silks but also into crustacean adhesion cements.
KeywordsMarine amphipod Crassicorophium bonellii Silk gland Extrusion spinning Barnacle Spider
- Case ST, Powers J, Hamilton R, Burton MJ (1994) Silk and silk proteins from two aquatic insects. In: Kaplan D, Adams WW, Farmer B, Viney C (eds) Silk polymers, 544 ACS Symposium Series. Washington, DC, pp 80–90Google Scholar
- Mondal M, Trivedy K, Kumar SN (2007) The silk proteins, sericin and fibroin in silkworm, Bombyx mori Linn. — a review. Caspian J Env Sci 5(2):63–76Google Scholar
- Talbot P, Demers D (1993) Tegumental glands of crustacea. In: Horst MN, Freeman JA (eds) The Crustacean integument: morphology and biochemistry. CRC Press, Boca Raton, FL, pp 151–192Google Scholar
- Vollrath F (2000) Coevolution of behaviour and material in the spider’s web. In: Domenici P, Blake RW (eds) Biomechanics in animal behaviour. Bios, Oxford, pp 315–329Google Scholar