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Reconstitution of Molybdoenzymes with Bis-Molybdopterin Guanine Dinucleotide Cofactors

  • Paul Kaufmann
  • Chantal Iobbi-Nivol
  • Silke Leimkühler
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 1876)

Abstract

Molybdoenzymes are ubiquitous and play important roles in all kingdoms of life. The cofactors of these enzymes comprise the metal, molybdenum (Mo), which is bound to a special organic ligand system called molybdopterin (MPT). Additional small ligands are present at the Mo atom, including water, hydroxide, oxo-, sulfido-, or selenido-functionalities, and in some enzymes, amino acid ligand, such as serine, aspartate, cysteine, or selenocysteine that coordinate the cofactor to the peptide chain of the enzyme. The so-called molybdenum cofactor (Moco) is deeply buried within the protein at the end of a narrow funnel, giving access only to the substrate. In 1974, an assay was developed by Nason and coworkers using the pleiotropic Neurospora crassa mutant, nit-1, for the reconstitution of molybdoenzyme activities from crude extracts. These studies have led to the understanding that Moco is the common element in all molybdoenzymes from different organisms. The assay has been further developed since then by using specific molybdenum enzymes as the source of Moco for the reconstitution of diverse purified apo-molybdoenzymes. Alternatively, the molybdenum cofactor can be synthesized in vitro from stable intermediates and subsequently inserted into apo-molybdoenzymes with the assistance of specific Moco-binding chaperones. A general working protocol is described here for the insertion of the bis-molybdopterin guanine dinucleotide cofactor (bis-MGD) into its target molybdoenzyme using the example of Escherichia coli trimethylamine N-oxide (TMAO) reductase.

Key words

Molybdoenzymes Molybdopterin (MPT) Molybdenum cofactor (Moco) Bis-molybdopterin guanine dinucleotide cofactor (bis-MGD) Trimethylamine N-oxide (TMAO) reductase 

Notes

Acknowledgments

The authors are supported by the Deutsche Forschungsgemeinschaft grants LE1171/6-2 and the Cluster of Excellence “Unicat” Exc314, coordinated by the TU Berlin (to S.L.), and the CNRS and AMU (to C. I.-N.)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Paul Kaufmann
    • 1
  • Chantal Iobbi-Nivol
    • 2
  • Silke Leimkühler
    • 1
  1. 1.Department of Molecular Enzymology, Institute of Biochemistry and BiologyUniversity of PotsdamPotsdamGermany
  2. 2.Aix-Marseille Université, CNRS, BIP UMR7281MarseilleFrance

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