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Structural basis of biological nitrogen fixation.

Douglas C Rees1, F Akif Tezcan, Chad A Haynes

  • 1Division of Chemistry and Chemical Engineering, 114-96, California Institute of Technology, Pasadena, CA 91125, USA. dcrees@caltech.edu

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|May 20, 2005
PubMed
Summary

Biological nitrogen fixation uses the nitrogenase enzyme to convert atmospheric nitrogen into ammonia. This overview details the nitrogenase enzyme

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Biological nitrogen fixation is crucial for life, converting atmospheric dinitrogen (N2) into ammonia (NH3).
  • The nitrogenase enzyme system, comprising MoFe-protein and Fe-protein, catalyzes this ATP-dependent reduction.
  • The FeMo-cofactor within the MoFe-protein serves as the active site for N2 reduction.

Purpose of the Study:

  • To provide an overview of the nitrogenase enzyme system.
  • To emphasize the structural organization of nitrogenase components and metalloclusters.
  • To discuss mechanistic inferences of ammonia formation based on recent advancements.

Main Methods:

  • Review of existing literature on nitrogenase biochemistry.
  • Analysis of structural data for MoFe- and Fe-proteins.

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  • Integration of insights from spectroscopy, model chemistry, and computational studies.

    • Main Results:

    • Detailed structural organization of the nitrogenase enzyme system is presented.
    • The role of metalloclusters in catalyzing nitrogen fixation under ambient conditions is highlighted.
    • Recent developments provide new mechanistic inferences for ammonia synthesis.

    Conclusions:

    • Nitrogenase possesses a remarkable structure enabling ambient nitrogen fixation.
    • Despite structural insights, the precise mechanism of ammonia formation remains an active area of research.
    • Interdisciplinary approaches are advancing our understanding of this vital biological process.