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Plant and Cell Physiology, 1985, Vol. 26, No. 6 1067-1074
© 1985

Article

Purification and Some Properties of Alcohol Acetyltransferase from Banana Fruit

Miki Harada, Yoshinori Ueda and Takashi Iwata

College of Agriculture, University of Osaka Prefecture Sakai, Osaka 591, Japan

Isoamyl acetate, one of the major characteristic aroma compounds of banana fruit (Musa sapientum L.), was synthesized by the condensation of acetyl-CoA and isoamyl alcohol under the action of alcohol acetyltransferase, which was found to be localized in the soluble fraction of pulp cells. The activity of this enzyme increased with the ripening of banana fruit.

The enzyme was purified about 62-fold. The purified enzyme was very labile at pHs lower than pH 7.0 but relatively stable at pH 7.5{small tilde}9. The enzyme was most active at 30°C and pH 8.5. The molecular weight was estimated to be about 40,000 by gel filtration. Its Km values for acetyl-CoA and isoamyl alcohol were 50 µM and 0.4 mM, respectively.

(Received January 28, 1985; Accepted May 30, 1985)
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