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Ethylene Biosynthesis in A. thaliana

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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 [...]


1.Ethylene signal transduction in Arabidopsis.
Liu Q, Zhou GY, Wen CK.
Zhi Wu Sheng Li Yu Fen Zi Sheng Wu Xue Xue Bao. 2004 Jun;30(3):241-50.
2.Importance of methionine biosynthesis for Arabidopsis seed germination and seedling growth.
Gallardo K, Job C, Groot SP, Puype M, Demol H, Vandekerckhove J, Job D.
Physiol Plant. 2002 Oct;116(2):238-247.
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