French Infrastructure for Integrated Structural Biology (FRISBI)
ANR-10-INBS-05-02
フランス
Grenoble Alliance for Integrated Structural Cell Biology (GRAL)
ANR-17-EURE-0003
フランス
引用
ジャーナル: Nat Chem Biol / 年: 2025 タイトル: Dynamics driving the precursor in NifEN scaffold during nitrogenase FeMo-cofactor assembly. 著者: Lucía Payá Tormo / Tu-Quynh Nguyen / Cameron Fyfe / Hind Basbous / Katarzyna Dobrzyńska / Carlos Echavarri-Erasun / Lydie Martin / Giorgio Caserta / Pierre Legrand / Andrea Thorn / ...著者: Lucía Payá Tormo / Tu-Quynh Nguyen / Cameron Fyfe / Hind Basbous / Katarzyna Dobrzyńska / Carlos Echavarri-Erasun / Lydie Martin / Giorgio Caserta / Pierre Legrand / Andrea Thorn / Patricia Amara / Guy Schoehn / Mickaël V Cherrier / Luis M Rubio / Yvain Nicolet / 要旨: Nitrogenase catalyzes atmospheric nitrogen fixation, a critical biological process that depends on an intricate organometallic cofactor assembled by a dedicated multiprotein system. Here we uncover ...Nitrogenase catalyzes atmospheric nitrogen fixation, a critical biological process that depends on an intricate organometallic cofactor assembled by a dedicated multiprotein system. Here we uncover the structural basis for the function of NifEN, the scaffold protein that mediates the final stages of cofactor biosynthesis before its incorporation into nitrogenase. High-resolution structural analyses reveal that the cofactor precursor initially binds at a surface docking site before being transferred into a specialized cavity for further maturation. This process involves dynamic structural rearrangements, including coordinated domain motions and partial unfolding, enabling the scaffold to alternate between open and closed states. Additionally, a rear channel extends to the precursor-binding cavity, likely facilitating the entry of the modifying components molybdenum and homocitrate. These findings illuminate the dynamic mechanisms underlying FeMo-cofactor assembly and underscore the functional divergence between NifEN, the biosynthetic scaffold, and NifDK, the catalytic component of nitrogenase.