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PLANT PHYSIOLOGY , Vol 105, Issue 3 975-979, Copyright © 1994 by American Society of Plant Biologists

METABOLISM AND ENZYMOLOGY

N-Terminal Amino Acid Sequence of Persimmon Fruit [beta]-Galactosidase

I. K. Kang, S. G. Suh, K. C. Gross and J. K. Byun
Department of Horticulture, Yeungnam University, Kyongsan 712-749, Korea (I.-K.K., S.-G.S., J.-K.B.)

[beta]-Galactosidase (EC 3.2.1.23) from persimmon fruit was purified 114-fold with a 15% yield using Sephadex G-100 gel filtration, CM-Sephadex ion exchange, and Sephacryl S-200 gel filtration chromatography, with subsequent electroelution from nondenaturing polyacrylamide gel electrophoresis (PAGE) gels. The estimated molecular mass of the native [beta]-galactosidase by Sephacryl S-200 was 118 kD. After sodium dodecyl sulfate-PAGE of the enzyme electroeluted from native gels, two subunits with estimated molecular masses of 34 and 44 kD were observed, suggesting that the native enzyme was an aggregate of several subunits. Amino acid composition and N-terminal amino acid sequences of the two major subunits were different.


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