Australian Consulate-General, Guangzhou
Media Release PD 41/07 3 December 2007
Bees Are the New Silkworms -- New Australian Study
Moths and butterflies, particularly silkworms, are well known producers of silk. And we all know spiders use it for their webs. But they are not the only invertebrates who make use of the strength and versatility of silk.
Dr Tara Sutherland - a scientist with Australia’s major industrial research body – the CSIRO and her entomology group have been looking at silks produced by other insects.
The results of their recent work have been published in Molecular Biology and Evolution, in the paper Conservation of Essential Design Features in Coiled Coil Silks.
Dr Sutherland said that most people were unaware that bees and ants produce silk, but the tiny insects do. “And their silk’s molecular structure is very different to that of the large protein, sheet structure of moth and spider silk,” she said.
“The cocoon and nest silks which our team studied consisted of coiled coils - a protein structural arrangement where multiple helices wind around each other. This structure produces a light weight, very tough silk,” she added.
“We had already identified the honeybee silk genes and now we have identified and sequenced the silk genes of bumblebees, bulldog ants and weaver ants, and compared these to honeybee silk genes. This lets us identify the essential design elements for the assembly and function of coiled coil silks”.
“We identified and compared the coiled coil proteins from cocoon and nest silks from species which span the evolutionary tree of the social Hymenoptera (bees, ants and wasps),” she said.
Bees and ants produced high-performance silk and, although the silks in all these species are produced by the larvae and by the same glands, they use them differently. Honeybee larvae produce silk to reinforce the wax cells in which they pupate, bulldog ant larvae spin solitary cocoons for protection during pupation, bumblebee larvae spin cocoons within wax hives (the cocoons are reused to store pollen and honey), and weaver ants use their larvae as ‘tools’ to fasten fresh plant leaves together to form large communal nests.
Dr Sutherland said that these groups of insects have evolved silks which were very tough and stable in comparison to the classical sheet silks and it is probable that the evolution of this remarkable material has underpinned the success of the social Hymenoptera.
Coiled coil silks are common in aculeate social insects – i.e, those insects that have stings, but not in aculeate parasitic wasps. These social insects are higher up the evolutionary tree and the coiled coil silks appear to have evolved about 155 million years ago.
The silk research is part of a Crop Biofactories Initiative supported by the Australian Government, the CSIRO and the Australian Grains Research & Development Corporation.
For further information, please contact Ms Willow Li, Research Assistant (Tel: 020 3814 0186, E-mail: [email protected])