Platypus Milk Fights Superbugs

The platypus, an extraordinary mammal native to Australia, is a creature of many peculiarities, not least of which is its method of feeding its young. Unlike most mammals, which possess teats, the mother platypus secretes milk through pores onto specialized patches on her abdomen. Her offspring then lap up this milk, which, due to its exposure to the external environment, would ordinarily be highly susceptible to bacterial contamination. This unusual lactation strategy is believed to have driven the evolution of remarkable protective properties within the milk itself.

Scientists from Deakin University initially discovered in 2010 that platypus milk contains potent antibacterial agents. Further research, particularly by Australia's national science agency CSIRO in collaboration with Deakin University, led to the isolation and structural characterization of a unique protein responsible for these properties. This protein, formally known as Monotreme Lactation Protein (MLP), was nicknamed the "Shirley Temple" protein because of its distinctive ringlet-like, three-dimensional fold, a structure unlike any other known protein. This novel fold is thought to be key to its ability to combat bacteria.

The discovery of this unique protein offers a promising avenue in the global fight against antibiotic-resistant superbugs. The "Shirley Temple" protein has demonstrated effectiveness against dangerous bacteria such as *Staphylococcus aureus* and *Enterococcus faecalis*. Because its structure and mechanism of action are so different from existing antibiotics, it presents the potential for developing entirely new classes of drugs. This could provide a crucial advantage in overcoming the resistance that many bacteria have developed to conventional treatments, ultimately leading to new therapeutic strategies for persistent infections.