This deep-sea enzyme survives heat that destroys most proteins
AI Summary: Researchers isolated and studied the nitrogenase enzyme from the deep-sea archaeon Methanocaldococcus infernus, which enables nitrogen fixation under extreme conditions. The enzyme, found to be unusually resistant to heat, only breaks down at 90 °C and remains partially intact at 98 °C. The team determined the molecular structure of the enzyme at near-atomic resolution, revealing it to be a simple yet combined form of the molybdenum, vanadium, and iron-only nitrogenase families. This discovery provides insights into the evolution of nitrogenases and how they facilitate nitrogen fixation under extreme conditions.