The Formation of ACC and Competition Between Polyamines and Ethylene for SAM

Smadar Harpaz-Saad*, Gyeong Mee Yoon, Autar K. Mattoo, Joseph J. Kieber

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

64 Scopus citations


S-adenosylmethionine (SAM) acts both as a precursor for the production of ethylene and as a substrate in the biosynthesis of polyamines. The conversion of SAM to 1-aminocyclopropane-1-carboxylic acid (ACC) is a key regulatory step in the biosynthesis of ethylene and is catalyzed by the enzyme ACC synthase (ACS), which is encoded by a multi-gene family in plants. The various ACS isoforms have diverse properties, both in terms of biochemical characteristics and regulated turnover in vivo.Here, the characteristics of the ACS gene families and the encoded proteins in various plant species, as well as the synthesis and role of polyamines and the flow of SAM into these two pathways, are discussed.

Original languageAmerican English
Title of host publicationThe Plant Hormone Ethylene
Number of pages29
ISBN (Electronic)9781118223086
ISBN (Print)9781444330038
StatePublished - 14 Feb 2012
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2012 by Blackwell Publishing Ltd. All rights reserved.


  • ACC synthase (ACS)
  • Dimerization
  • Phosphorylation
  • Polyamines
  • Posttranscriptional regulation
  • S-adenosylmethionine (SAM)


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