Partial Purification and Characterization of the Gibberellin A20 3β-Hydroxylase from Seeds of Phaseolus vulgaris
- 1 November 1990
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 94 (3) , 1390-1401
- https://doi.org/10.1104/pp.94.3.1390
Abstract
The GA(20) 3beta-hydroxylase present in immature seeds of Phaseolus vulgaris has been partially purified and characterized. The physical characteristics of the enzyme are similar to those of the GA 2beta-hydroxylases present in mature and immature seeds of Pisum sativum. It is acid-labile, hydrophobic, and of M(r) 45,000. The enzyme catalyzes the synthesis of GA(1), GA(5), and GA(29) from GA(20). Activity is dependent upon the presence of Fe(2+), ascorbate, 2-oxoglutarate, and oxygen. 2-Oxoglutarate does not function as a cosubstrate; in the presence of the enzyme, succinate is not a reaction product.Keywords
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