Actin provides cells with stability, mobility and the ability to transport molecular cargo. It is also a key player for muscle contraction and cell division. These diverse functions make it one of the most abundant, most important and therefore most intensively studied proteins. One aspect of these studies is the role of actin in the development of cancer and in many other diseases. Marker molecules aimed at highlighting actin under the microscope have so far suffered from several restrictions. Researchers at the Max Planck Institutes of Biochemistry and Neurobiology in Martinsried, Germany, were now able to develop a novel actin marker from a naturally occurring protein that binds to actin in yeast cells. The researchers successfully introduced the so-called “Lifeact” into various types of cells and tissues without effects on cellular actin functions, making it superior to its competitors. The new marker could for the first time allow basic as well as biomedical research on actin without restrictions. (Nature Methods, June 8, 2008)
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