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The biosynthesis of the molybdenum cofactors

  • Ralf R. Mendel
  • Silke LeimkühlerEmail author
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Part of the following topical collections:
  1. Topical Issue on Molybdenum and Tungsten Enzymes: from Biology to Chemistry and Back

Abstract

The biosynthesis of the molybdenum cofactors (Moco) is an ancient, ubiquitous, and highly conserved pathway leading to the biochemical activation of molybdenum. Moco is the essential component of a group of redox enzymes, which are diverse in terms of their phylogenetic distribution and their architectures, both at the overall level and in their catalytic geometry. A wide variety of transformations are catalyzed by these enzymes at carbon, sulfur and nitrogen atoms, which include the transfer of an oxo group or two electrons to or from the substrate. More than 50 molybdoenzymes were identified to date. In all molybdoenzymes except nitrogenase, molybdenum is coordinated to a dithiolene group on the 6-alkyl side chain of a pterin called molybdopterin (MPT). The biosynthesis of Moco can be divided into three general steps, with a fourth one present only in bacteria and archaea: (1) formation of the cyclic pyranopterin monophosphate, (2) formation of MPT, (3) insertion of molybdenum into molybdopterin to form Moco, and (4) additional modification of Moco in bacteria with the attachment of a nucleotide to the phosphate group of MPT, forming the dinucleotide variant of Moco. This review will focus on the biosynthesis of Moco in bacteria, humans and plants.

Keywords

Molybdenum Molybdenum cofactor cPMP bis-MGD Sulfuration Sulfite oxidase 

Notes

Acknowledgments

The authors thank all current and former members of their research groups in addition to collaboration partners who were involved in this work over the past years and decades. The work was mainly supported by continuous grants of the Deutsche Forschungsgemeinschaft to S.L. and to R.R.M.

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© SBIC 2014

Authors and Affiliations

  1. 1.Institute of Plant BiologyBraunschweig University of TechnologyBraunschweigGermany
  2. 2.Department of Molecular Enzymology, Institute of Biochemistry and BiologyUniversity of PotsdamPotsdamGermany

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