Related Experiment Video
Updated: May 24, 2026
13:36
Synthetic Spider Silk Production on a Laboratory Scale
Published on: July 18, 2012
Silk from crickets: a new twist on spinning
Andrew A Walker1, Sarah Weisman, Jeffrey S Church
1Evolution, Ecology and Genetics, Research School of Biology, Australian National University, Canberra, Australia.
Plos One
|February 23, 2012
Summary
Raspy crickets produce unique silk for shelters, composed of beta-sheet proteins. Their novel fabrication method, unlike other silks, doesn't rely on shear forces for protein folding.
Area of Science:
- Biochemistry
- Materials Science
- Entomology
Background:
- Raspy crickets (Orthoptera: Gryllacrididae) are unique among insects for silk production.
- Silk is utilized by these crickets for constructing shelters.
Purpose of the Study:
- To investigate the material composition of cricket silk for the first time.
- To elucidate the fabrication process of cricket silk.
Main Methods:
- Micro-Raman spectroscopy to analyze silk composition and structure.
- Mass spectrometry and cDNA library analysis to identify silk proteins.
- Examination of silk-webs produced in captivity.
Main Results:
- Cricket silk is protein-based, with fibers and films sharing identical amino acid composition and beta-sheet secondary structure.
- Four silk proteins were identified, including a large, abundant protein rich in alanine, glycine, and serine with repetitive motifs.
- A novel fabrication mechanism was discovered, involving the labium-hypopharynx for controlled fiber and film formation, independent of shear forces.
Conclusions:
- Cricket silk proteins share characteristics with other known beta-sheet silks, suggesting convergent evolution at the molecular level.
- Crickets have evolved a distinct mechanism for silk fabrication, differing from other silk-producing species.
- The study provides the first detailed insight into the composition and fabrication of raspy cricket silk.
Related Concept Videos
01:08Spin–Spin Coupling Constant: Overview
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
01:17Spin–Spin Coupling: One-Bond Coupling
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
01:09Rolling Without Slipping
People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is essential...