Ethylene (C2H4) is a Plant hormone involved in a large number of developmental processes including Ripening of Fruit, Abscission, Senescence and Responses to Wounding. Ethylene Biosynthesis is best understood among the plant hormone pathways (Ref.1). In higher plants, Ethylene is produced from L-Methionine. Carbons C3 and C4 of Methionine is activated by ATP to form Adomet (S-Adenosylmethionine) through the Catalytic activity of SAM (S- Adenosylmethionine Synthetase). The Methionine can be recycled again involving several steps. Adomet formed from Methionine is fragmented to give MTA (5`-Methylthioadenosine) and ACC (1-Aminocyclopropane-1-Carboxylic Acid). MTA is hydrolyzed to MTR (5-Methylthioribose) and Adenine, and phosphorylation of MTR by MTR kinase yields MTR-1P (5-Methylthioribose-1-Phosphate). Loss of the phosphate group of MTR-1P, concurrent with the rearrangement of the [...]