Effect of the minor ABA metabolite 7′-hydroxy-ABA on Arabidopsis ABA 8′-hydroxylase CYP707A3
摘要:
To examine the effect of the minor abscisic acid (ABA) metabolite 7'-hydroxy-ABA on Arabidopsis ABA W-hydroxylase (CYP707A3), we developed a novel and facile, four-step synthesis of 7'-hydroxy-ABA from alpha-ionone. Structural analogues of Thydroxy-ABA, 1'-deoxy-7'-hydroxy-ABA, and 7'-oxo-ABA were also synthesized to evaluate the role of the T-hydroxyl group on binding to the enzyme. The result of enzyme inhibition assay suggests that the local polarity at C-T, neither steric bulkiness nor overall molecular hydrophilicity, would be the major reason why (+)-7'-hydroxy-ABA is not a potent inhibitor of CYP707A3. (C) 2007 Elsevier Ltd. All rights reserved.