Your body recycling itself captured on film

Discovery shows how cells decide what to recycle, unlocking debilitating disease's secret. Our bodies recycle proteins, the fundamental building blocks that enable cell growth and development. Proteins are made up of a chain of amino acids, and scientists have known since the 1980s that first one in the chain determines the lifetime of a protein. McGill researchers have finally discovered how the cell identifies this first amino acid - and caught it on camera. 'There are lots of reasons cells recycle proteins ' fasting, which causes loss of muscle, growth and remodeling during development, and normal turnover as old proteins are replaced to make new ones,? explained lead researcher, Dr. Kalle Gehring, from McGill's Department of Biochemistry. 'One way that cells decide which proteins to degrade is the presence of a signal known as an N-degron at the start of the protein. By X-ray crystallography, we discovered that the N-degron is recognized by the UBR box, a component of the cells' recycling system.' The powerful technique can pinpoint the exact location of atoms and enabled the team to capture an image of the UBR box, providing insight to this incredibly tiny yet essential part of our bodies? chemical mechanics.