Ethylene Metabolic Pathway in Arabidopsis Pi O2 H3C S H2C H3C O-P O H H OH H OH H O H2 C C H2 C S COO- a-Keto-g-methylthiobutyric acid +NH3 5'-Methylthioribose 1-phosphate R ADP O MTR kinase ATP H3C R H3C S H2C H OH H OH ATP SAM synthetase PPi + Pi NH2 N H N COO- Methionine 5'-Methylthioribose N C +NH3 H2 C C COOH H2 C S OH O H H N COO- C H NH2 H3C MTA nucleosidase S N H2C N O H H OH H OH H N N H3C ACC synthase S+ H2 C H2C NH3 H2 C C COOH NH2 N O H H OH H OH H 5'-Methylthioadenosine N N N S-Adenosyl-L-methionine (SAM) +NH3 H 2C C H 2C COO- 1-Aminocyclopropane-1-carboxylic acid (ACC) 1/2 O2 CO2 + HCN + H2O ACC oxidase H H C H C H Ethylene
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