Inhibition by Ethylene of Polyamine Biosynthetic Enzymes Enhanced Lysine Decarboxylase Activity and Cadaverine Accumulation in Pea Seedlings 1
AUTOR(ES)
Icekson, Isaac
RESUMO
Exposing etiolated pea seedlings to ethylene which inhibited the activity of arginine decarboxylase and S-adenosylmethionine decarboxylase caused an increase in the level of cadaverine. The elevated level of cadaverine resulted from an increase in lysine decarboxylase activity in the tissue exposed to ethylene. The hormone did not affect the apparent Km of the enzyme, but the apparent Vmax was increased by 96%. While lysine decarboxylase activity in the ethylene-treated plants increased in both the meristematic and the elongation zone tissue, cadaverine accumulation was observed in the latter only. The enhancement by ethylene of the enzyme activity was reversed completely 24 hours after transferring the plants to an ethylene-free atmosphere. It is postulated that the increase in lysine decarboxylase activity, and the consequent accumulation of cadaverine in ethylene-treated plants, is of a compensatory nature as a response to the inhibition of arginine and S-adenosylmethionine decarboxylase activity provoked by ethylene.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1056169Documentos Relacionados
- Arginine and Ornithine Decarboxylases, the Polyamine Biosynthetic Enzymes of Mung Bean Seedlings 1
- Ethylene-enhanced Synthesis of Phenylalanine Ammonia-Lyase in Pea Seedlings 1
- Control of lysine biosynthesis in Bacillus subtilis: inhibition of diaminopimelate decarboxylase by lysine.
- Influence of Ethylene Produced by Soil Microorganisms on Etiolated Pea Seedlings
- Lysine Decarboxylase Activity in Broth and Agar Media
