International Research Team Unveils Atomic-Scale Structure of Copper Enzyme Crucial for Nitrogen Cycle
An international team of researchers has achieved a significant breakthrough in structural biology by elucidating the atomic-resolution structures of the enzyme copper nitrite reductase (CuNiR) using X-ray Free Electron Laser (XFEL) technology. This enzyme is vital in the global nitrogen cycle, catalyzing the conversion of nitrite ions into nitric oxide gas, a process essential for environmental biochemistry and microbial metabolism. The research was conducted by a collaboration between the University of Liverpool, Japan's University of Hyogo, and Argentine scientists, utilizing the XFEL facility at SACLA in Japan. XFEL technology allows for capturing diffraction patterns before radiation damage occurs, providing clear images of protein structures. The study resolved a long-standing debate about CuNiR's catalytic mechanism, demonstrating an ordered sequence of substrate and cofactor interactions. This research marks a methodological leap in biomolecular imaging, offering insights into the enzyme's efficien... 
