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Identification of a nitrogenase FeMo cofactor precursor on NifEN complex
Yilin Hu1, Aaron W Fay, Markus W Ribbe
1Department of Molecular Biology and Biochemistry, University of California, Irvine, CA 92697-3900, USA.
Summary
Researchers identified a key precursor in the FeMoco cofactor assembly pathway. This finding, using a novel FeMoco-maturation assay, clarifies essential components for nitrogenase function.
Area of Science:
- Biochemistry
- Nitrogen Fixation
- Enzyme Mechanisms
Background:
- Nitrogenase is crucial for converting atmospheric nitrogen into ammonia.
- The iron-molybdenum cofactor (FeMoco) is central to nitrogenase activity.
- FeMoco biosynthesis involves complex protein machinery, including NifB and the NifEN complex.
Purpose of the Study:
- To identify and characterize an intermediate in FeMoco biosynthesis.
- To elucidate the essential components required for FeMoco maturation.
- To establish a new in vitro assay for studying FeMoco assembly.
Main Methods:
- Purification of NifEN complex and associated FeMoco precursor.
- Development of an FeMoco-maturation assay using purified components.
- Analysis of essential factors (molybdate, homocitrate, MgATP, Fe protein) for maturation.
Main Results:
- Identification of a NifEN-bound FeMoco precursor.
- Demonstration that the precursor can be converted to mature FeMoco in vitro.
- Confirmation of molybdate, homocitrate, MgATP, and Fe protein as essential for maturation.
Conclusions:
- The NifEN complex binds a FeMoco precursor that is critical for maturation.
- The FeMoco-maturation assay provides a powerful tool for studying FeMoco biosynthesis.
- This work advances our understanding of the intricate FeMoco assembly pathway.