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Sequence-specific Labeling of Nucleic Acids and Proteins with Methyltransferases and Cofactor Analogues
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Published on: November 22, 2014

S-Adenosylmethionine decarboxylase.

Anthony E Pegg1

  • 1Department of Cellular and Molecular Physiology, The Pennsylvania State University College of Medicine, Hershey, PA 17033, USA. aep1@psu.edu

Essays in Biochemistry
|January 26, 2010
PubMed
Summary
This summary is machine-generated.

S-Adenosylmethionine decarboxylase (SAMD) is crucial for polyamine synthesis, catalyzing the formation of decarboxylated S-adenosylmethionine. Its activity is tightly regulated to control polyamine levels, with inhibitors showing potential as anticancer and anti-trypanosomal agents.

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Published on: December 20, 2010

Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • S-Adenosylmethionine decarboxylase (SAMD) is a vital enzyme in polyamine biosynthesis across diverse species.
  • It catalyzes the production of decarboxylated S-adenosylmethionine, the sole aminopropyl donor for polyamine synthesis.
  • SAMD activity is tightly regulated to maintain low levels of decarboxylated S-adenosylmethionine, responding to polyamine synthesis demands.

Purpose of the Study:

  • To detail the structural and mechanistic features of S-Adenosylmethionine decarboxylase.
  • To explore the autocatalytic generation of its pyruvate prosthetic group and the decarboxylation reaction mechanism.
  • To review inhibitors of SAMD and their therapeutic applications, alongside regulatory mechanisms in mammals.

Main Methods:

  • Structural analysis of S-Adenosylmethionine decarboxylase.
  • Mechanistic studies of enzyme activity and prosthetic group generation.
  • Review of existing literature on SAMD inhibitors and regulation.

Main Results:

  • All SAMD enzymes share a conserved structure with a covalently bound pyruvate prosthetic group essential for catalysis.
  • The enzyme utilizes an autocatalytic mechanism for pyruvate generation from a proenzyme precursor.
  • Inhibitors of SAMD demonstrate potential in anticancer and anti-trypanosomal therapies.

Conclusions:

  • S-Adenosylmethionine decarboxylase is a highly regulated enzyme critical for polyamine synthesis.
  • Understanding its intricate mechanisms and structure facilitates the development of novel therapeutic agents.
  • Further research into SAMD regulation and inhibition holds promise for treating various diseases.