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S-adenosylmethionine: nothing goes to waste
Marc Fontecave1, Mohamed Atta, Etienne Mulliez
1Laboratoire de Chimie et Biochimie des Centres Rédox Biologiques, UMR no. 5047, Université Joseph Fourier, Département Réponse et Dynamique Cellulaires, CEA/CNRS Grenoble, 17 avenue des Martyrs, 38054 Grenoble Cedex 09, France. mfontecave@cea.fr
Trends in Biochemical Sciences
|May 8, 2004
Summary
S-adenosylmethionine (SAM) is a key biological molecule that acts as a major methyl donor and participates in various biosynthetic pathways. Its unique chemical structure allows all its components to be utilized in diverse metabolic reactions.
Area of Science:
- Biochemistry
- Organic Chemistry
- Molecular Biology
Background:
- S-adenosylmethionine (SAM), also known as AdoMet, is a crucial biological sulfonium compound.
- SAM serves as the primary biological methyl group donor in enzymatic reactions catalyzed by methyltransferases.
Purpose of the Study:
- To elucidate the diverse chemical roles and reaction mechanisms of S-adenosylmethionine (SAM).
- To highlight the unique chemical versatility of SAM in biological systems.
Main Methods:
- Review of biochemical literature on SAM-catalyzed reactions.
- Analysis of the chemical properties and reactivity of SAM's molecular structure.
- Discussion of reaction mechanisms involving SAM as a methyl donor, methylene group donor, and radical initiator.
Main Results:
- SAM functions as a methyl donor, methylene group donor, amino group donor, ribosyl group donor, and aminopropyl group donor.
- SAM is a source of 5'-deoxyadenosyl radicals upon one-electron reduction, initiating metabolic reactions.
- The chemistry of SAM reactions is largely driven by the electrophilic nature of carbons adjacent to the positively charged sulfur atom.
- All constituent parts of SAM possess chemical utility in biological processes.
Conclusions:
- S-adenosylmethionine (SAM) exhibits remarkable chemical versatility, participating in a wide array of essential biological transformations.
- The unique structure and reactivity of SAM underscore its central role in numerous metabolic and biosynthetic pathways.