“Snapshot” of the unfolding of the CylR2 protein from Enterococcus fae-
calis; © MPIbpc/DZNE, Zweckstetter
When proteins lose their shape, the consequences can be fatal. In some cases they form insoluble, toxic clumps that can cause neurodegenerative diseases. The gradual unfolding has been “filmed” now for the first time.
Whether Alzheimer’s, Parkinson’s or Huntington’s Chorea – all three diseases have one thing in common: They are caused by misfolded proteins that form clumps in the brains of affected patients and, finally, destroy their nerve cells. One of the most important questions in the biological sciences and medicine is thus: How do proteins achieve or lose their three-dimensional structure. But what exactly happens when proteins fold or unfold was previously nearly impossible to investigate. With heat and pressure, proteins easily lose their shape. However, such methods are not suitable for directly observing their unfolding process. The intermediate forms that occur in the course of protein folding are much too transient.
With a novel approach, researchers have now succeeded in “filming” the complex process of protein folding for the first time. Scientists at the Max Planck Institute for Biophysical Chemistry (MPIbpc) and the German Center for Neurodegenerative Diseases (DZNE) in Göttingen, together with their colleagues at the Polish Academy of Sciences in Warsaw and at the University of Warsaw, have rendered visible – at atomic resolution – how a protein progressively “loses its shape”. In doing so, the researchers had pinned their hopes on low temperatures. “If a protein is slowly cooled down, its intermediate forms accumulate in larger quantities than in commonly used denaturation methods, such as heat, pressure, or urea. We hoped that these quantities would be sufficient to examine the intermediate forms with nuclear magnetic resonance (NMR) spectroscopy,” said Markus Zweckstetter, head of the research groups.
As research object, Zweckstetter’s team chose a protein in Enterococcus faecalis, a pathogen frequently encountered in hospitals where it particularly jeopardizes patients with a weak immune system. But that is not the only reason why the so-called CylR2 protein is interesting. Some time ago, researchers working with Stefan Becker at the MPIbpc have shown that its three-dimensional shape makes CylR2 a particular promising candidate for the scientists’ approach. “ClyR2 is a relatively small protein composed of two identical subunits. This gave us a great chance to be able to visualize the individual stages of its unfolding process in the test tube," explained the chemists Mariusz and Lukasz Jaremko.
The two chemists cooled the protein successively from 25°C to -16°C and examined its intermediate forms with NMR spectroscopy. They achieved what they had hoped for: Their “film clip” shows at atomic resolution how the protein gradually unfolds. Zweckstetter describes exactly what happens in this process: “We clearly see how the CylR2 protein ultimately splits into its two subunits. The individual subunit is initially relatively stable. With further cooling, the protein continues to unfold and at -16 °C it is extremely instable and dynamic. This instable protein form provides the seed for folding and can also be the “trigger” for misfolding.” The scientist’s findings may help to gain deeper insights into how proteins assume their spatial structure and why intermediate forms of certain proteins misfold in the event of illness.
COMPAMED.de; Quelle: Max-Planck-Institute for Biophysical Chemistry (MPIbpc)