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Structural and Mechanistic Properties of E. Coli Adenosylmethionine Decarboxylase

  • David L. Anton
  • Rusty Kutny
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 250)

Abstract

Adenosylmethionine decarboxylase catalyzes one of the first committed steps in polyamine biosynthesis. It is a member of a small class of decarboxylases that use a pyruvoyl prosthetic group rather than the more common pyridoxal cofactor. We have recently shown that AdoMet decarboxylase from E. coli is composed of stoichiometric amounts of two types of subunits; α (Mr= 19,000), and β (Mr= 14,000). The NH2-terminal of the α subunit is blocked by the pyruvoyl group and can be sequenced only after reductive amination, which converts this to an alanine residue. The β subunit, on the other hand, has an unblocked NH2-terminal and sequences normally. The molecular weight of the holoenzyme, estimated by gel filtration, is 136,000 suggesting that the enzyme is an α4β4 octamer.

AdoMet decarboxylase undergoes a time dependent inactivation during turnover. The mechanism of this inactivation involves a transamination from the product, decarboxylated AdoMet, and the pyruvoyl group generating an NH2-terminal alanine. The nascent product aldehyde then eliminates methylthioadenosine, resulting in the formation of acrolein, which covalently labels the α subunit. How this mechanism may explain AdoMet decarboxylase turned over, and how AdoMet decarboxylase inhibitors can affect its half life will be discussed.

Keywords

Schiff Base Reductive Amination Pyridoxal Phosphate Polyamine Biosynthesis Histidine Decarboxylase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • David L. Anton
    • 1
  • Rusty Kutny
    • 1
  1. 1.Central Research and DevelopmentE.I. du Pont de Nemours Co.WilmingtonUSA

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