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Plant Physiology 83:557-563 (1987)
© 1987 American Society of Plant Biologists

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Metabolism and Enzymology

Hevea Linamarase—A Nonspecific {beta}-Glycosidase 1

Dirk Selmar, Reinhard Lieberei, Böle Biehl and Jürgen Voigt

Botanisches Institut der Technischen Universität, Postfach 3329, D-3300 Braunschweig, Federal Republic of Germany, Institut für Allgemeine Botanik, D-2000 Hamburg 52, Federal Republic of Germany

In the leaf tissue of the cyanogenic plant Hevea brasiliensis, which contains large amounts of linamarin, there is no specific linamarase. In Hevea leaves only one {beta}-glucosidase is detectable. It is responsible for the cleavage of all {beta}-glucosides and {beta}-galactosides occurring in Hevea leaf tissue, including the cyanogenic glucoside linamarin. Therefore, the enzyme is referred to as a {beta}-glycosidase instead of the term {beta}-glucosidase. This {beta}-glycosidase has a broad substrate spectrum and occurs in multiple forms. These homo-oligomeric forms are interconvertible by dissociation-association processes. The monomer is a single protein of 64 kilodaltons.

1 This work was partially financed by a grant of the Deutsche Forschungsgemeinschaft (Li 238/1).




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