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.
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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
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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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Bittner, F., Mendel, RR. (2010). Cell Biology of Molybdenum. In: Hell, R., Mendel, RR. (eds) Cell Biology of Metals and Nutrients. Plant Cell Monographs, vol 17. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-10613-2_6
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