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A discovery on how botox聽鈥� a drug made from a deadly biological substance聽鈥� enters brain cells could assist in development of treatments for a rare but potentially fatal bacterial infection, botulism.

Professor Frederic Meunier and Dr Merja Joensuu at UQ鈥檚 have discovered the specific molecular mechanism by which the highly deadly botulinum neurotoxin type-A, more widely known as botox, enters neurons.

鈥淲e used super-resolution microscopy to show that a receptor called Synaptotagmin 1 binds to two other previously known clostridial neurotoxin receptors to form a tiny complex that sits on the plasma membrane of neurons,鈥� Meunier said.

鈥淭he toxin hijacks this complex and enters the synaptic vesicles which store neurotransmitters critical to communication between neurons.

鈥淏otox then interrupts the communication between nerves and muscle cells, causing paralysis.鈥�

Now we know how this complex allows the toxin internalisation, we can block interactions between any two of the three receptors to stop the deadly toxins from getting into neurons, Meunier said.

The injectable drug botox was originally developed to treat people with the eye condition strabismus, but was quickly found to alleviate migraine, chronic pain and spasticity disorders.

Now, it鈥檚 regularly used in plastic surgeries and is commonly known as a cosmetic treatment to smooth wrinkles.

Joensuu said just how the neurotoxin worked to relax muscles has previously been difficult to track.

鈥淐lostridial neurotoxins are among the most potent protein toxins known to humans,鈥� Joensuu said.

鈥淲e now have a full picture of how these toxins are internalised to intoxicate neurons at therapeutically relevant concentrations.鈥�

The UQ team collaborated with researchers from the Hannover Medical School, University of Edinburg and University of Helsinki for the project. Findings have been published in the EMBO Journal.

Dr Merja Joensu. Image courtesy of UQ.