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In enzymology, a gibberellin 3beta-dioxygenase (EC 1.14.11.15) is an enzyme that catalyzes the chemical reaction

gibberellin 20 + 2-oxoglutarate + O₂ ${\displaystyle \rightleftharpoons }$ gibberellin 1 + succinate + CO₂

The 3 substrates of this enzyme are gibberellin 20, 2-oxoglutarate, and O₂, whereas its 3 products are gibberellin 1, succinate, and CO₂.

This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O2 as the oxidant. The oxygen incorporated need not be derived from O2 with 2-oxoglutarate as one donor, and one atom of oxygen is incorporated into each donor. The systematic name of this enzyme class is (gibberellin-20), 2-oxoglutarate: oxygen oxidoreductase (3beta-hydroxylating). Other names in common use include gibberellin 3beta-hydroxylase, (gibberrellin-20), 2-oxoglutarate: oxygen oxidoreductase and (3beta-hydroxylating). This enzyme participates in diterpenoid biosynthesis. It has 2 cofactors: iron and Ascorbate.

References

• Kwak SS, Kamiya Y, Sakurai A, Takahishi N, Graebe JE (1988). "Partial-purification and characterization of gibberellin 3beta-hydroxylase from immature seeds of Phaseolus vulgaris L". Plant Cell Physiol. 29: 935–943.

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