Unusually elastic protein found by researchers; may have originated in cnidarian elastomer

Elastomeric proteins evolved in a diverse range of animals and often fulfil highly specialised biological functions as the elastin in the pulmonary alveoli of higher vertebrates, the resilin in the wing joints of insects or the spidroin in the threads of spider silk. They give tissues mechanical properties that exceed those of artificial materials. These proteins, known as elastomers, share a common property -- structurally disordered, repetitive protein sequences that store energy when a molecule is stretched which then can be used in the form of a movement after release. These movements can be rhythmical, as in the blood vessels leaving the heart. Or they can be single, explosive movements, as in the jump of a grasshopper.

In their experiments on the freshwater polyp Hydra, the research team of Assistant Professor Dr. Suat Özbek and Prof. Dr. Thomas Holstein at the Centre for Organismal Studies (COS) demonstrated that cnidoin is part of the cnidarian weaponry -- the stinging capsules. These organelles help jellyfish, corals and sea anemones capture prey and ward off enemies. When touched, a tubule is ejected within nanoseconds in a harpoon-like fashion from the interior of the highly pressurised capsule. The discharge of the stinging thread is one of the fastest processes known in the animal kingdom. Its barbed tip injects poisons through the stinging thread that paralyse or kill the attacker or prey within seconds. "Cnidoin is a structural component of the capsule wall, which is elastically stretched prior to discharge and firing of the harpoon," explains Dr. Özbek.

Together with other researchers in Heidelberg and Munich, the scientists at COS investigated the biomechanical properties of cnidoin. Force measurements were performed on single molecules and computer simulations conducted. The special properties of the elastic protein are principally responsible for the enormous acceleration of the "harpoon tip" that occurs during the discharge process and, according to Dr. Özbek, exceeds five million g. "The biomechanical properties of cnidoin are comparable to those of other elastomers. However, cnidoin evidences extraordinarily fast recoil, probably due to the extensive cross-linking to the dense capsule wall."

The researcher points out that the molecular mechanism of elasticity emerged several times in the animal kingdom, independently of each other. "From an evolutionary standpoint, however, cnidoin is oldest elastic protein reported so far," states Suat Özbek. "We therefore assume that this elasticity originated in the cnidaria and evolved as part of their 'weapons system'."