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Int J Biol Macromol. 2000 Apr 12;27(2):157-62.

Exo- and endoglucanases of maize coleoptile cell walls: their interaction and possible regulation.

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  • 1Department of Biology and Earth Sciences, Faculty of Science, Ehime University, Matsuyama, Ehime, Japan. inouhe@sci.ehime-u.ac.jp


Glucanase-mediated degradation of beta-(1,3)(1,4)-glucans has been attributed to auxin-induced cell wall loosening and thus tissue growth in cereal plants, but the regulatory mechanisms for the auxin-enhancement of glucanase activities in situ are not fully understood. Here, we report evidence for possible mechanisms which might account for auxin-induced changes in glucanase activities. A likely cause for acceleration of wall glucan degradation is the change in the ratio of exo- and endoglucanases. The combined enzymes synergistically promote beta-(1,3)(1,4)-glucan hydrolysis. In addition, these enzyme activities are enhanced by other enzymic and non-enzymic proteins and are also partially stimulated by divalent cations such as Ca(2+) and Mg(2+) at certain pH values. The acceleration of glucan degradation mediated by auxin may be mediated by changes and/or interactions of any of these factors in situ.

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