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Cell Biology of Molybdenum

  • Florian Bittner
  • Ralf-Rainer MendelEmail author
Chapter
Part of the Plant Cell Monographs book series (CELLMONO, volume 17)

Abstract

The transition element molybdenum (Mo) is essential for (nearly) all biological systems as it is required by enzymes catalyzing diverse key reactions in the global carbon, sulfur,and nitrogen metabolism. The metal itself is biologically inactive unless it is complexed by a special cofactor. With the exception of bacterial nitrogenase, where Mo is a constituent of the FeMo-cofactor, Mo is bound to a pterin, thus forming the molybdenum cofactor (Moco), which is the active compound at the catalytic site of all other Mo-enzymes. In eukaryotes, the most prominent Mo-enzymes are nitrate reductase, sulfite oxidase, xanthine dehydrogenase, aldehyde oxidase, and the mitochondrial amidoxime reductase. The biosynthesis of Moco involves the complex interaction of six proteins and is a process of four steps, which also includes iron and copper in an indispensable way. Moco, as released after synthesis, is likely to be distributed to the apoproteins of Mo-enzymes by putative Moco-binding proteins. Xanthine dehydrogenase and aldehyde oxidase, but not sulfite oxidase and nitrate reductase, require the postranslational sulfuration of their Mo-site to become active.

Keywords

Molybdenum cofactor Molybdenum uptake Sulfite oxidase Nitrate reductase Xanthine dehydrogenase Aldehyde oxidase 

Abbreviations

ABA

Abscisic acid

AO

Aldehyde oxidase

Cnx1-E

N-terminal domain of Cnx1

Cnx1-G

C-terminal domain of Cnx1

cPMP

Cyclic pyranopterin monophosphate

Cu

Copper

IAA

Indole-3-acetic acid

Fe

Iron

FAD

Flavin adenine dinucleotide

mARC

Mitochondrial amidoxime reducing component

Mo

Molybdenum

MoBP

Molybdenum cofactor binding protein

Moco

Molybdenum cofactor

MPT

Molybdopterin

NR

Nitrate reductase

NO

Nitric oxide

ROS

Reactive oxygen species

SO

Sulfite oxidase

XDH

Xanthine dehydrogenase

XO

Xanthine oxidase

Notes

Acknowledgements

We thank the many people who worked with us over the years on molybdenum. In particular we are grateful to Dr. Robert Hänsch for critical discussions. The research was consistenly supported by the Deutsche Forschungsgemeinschaft (R.R.M., F.B.) which is gratefully acknowledged. Financial support came also from the European Union (R.R.M.) and the Fonds der Chemischen Industrie (R.R.M.).

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© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Department of Plant BiologyTechnical University of BraunschweigBraunschweigGermany

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