Apr, 2000
Exo- and endoglucanases of maize coleoptile cell walls: their interaction and possible regulation
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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- Volume
- 27
- Number
- 2
- First page
- 157
- Last page
- 162
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1016/S0141-8130(00)00112-4
- Publisher
- ELSEVIER SCIENCE BV
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 Ca2+ and Mg2+ 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. (C) 2000 Elsevier Science B.V. All rights reserved.
- Link information
- ID information
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- DOI : 10.1016/S0141-8130(00)00112-4
- ISSN : 0141-8130
- Web of Science ID : WOS:000086845700007