Lipid peroxidation forms ethylene from 1-aminocyclopropane-1-carboxylic acid and may operate in leaf senescence
AUTOR(ES)
Bousquet, Jean-Francois
RESUMO
An enzyme system is described which oxidizes 1-aminocyclopropane-1-carboxylic acid (ACC) to ethylene under physiological conditions. It comprises linoleic acid, pyridoxal phosphate, manganese, and lipoxygenase (linoleate:oxygen oxidoreductase, EC 1.13.11.12). It requires oxygen and is specific for manganese; it can operate but only with greatly reduced yield in the absence of pyridoxal phosphate. An enzyme with the same properties was prepared from microsomal membranes of the seedling shoots of peas. Both have similar reactions to a variety of inhibitors and other reagents. The properties also resemble those of at least two of the in vivo systems recorded in the literature. Intact green oat leaves also contain a similar system. Because there is a growing body of evidence that ethylene formation is associated with cell membranes and because the yields of ethylene from the complete system are much higher than those recorded for other enzymes, it may be identical with the in vivo system acting in senescent leaves.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=344991Documentos Relacionados
- Galactose Inhibits the Conversion of 1-Aminocyclopropane-1-Carboxylic Acid to Ethylene in Aged Tobacco Leaf Discs 12
- Some Characteristics of the System Converting 1-Aminocyclopropane-1-carboxylic Acid to Ethylene 1
- Formation of cyanide from carbon 1 of 1-aminocyclopropane-1-carboxylic acid during its conversion to ethylene
- Xylem Transport of 1-Aminocyclopropane-1-carboxylic Acid, an Ethylene Precursor, in Waterlogged Tomato Plants 1
- Ethylene Synthesis Regulated by Biphasic Induction of 1-Aminocyclopropane-1-Carboxylic Acid Synthase and 1-Aminocyclopropane-1-Carboxylic Acid Oxidase Genes Is Required for Hydrogen Peroxide Accumulation and Cell Death in Ozone-Exposed Tomato1