Alpha-Mannosidase II Isoenzyme in the Peribacteroid Space ofGlycine maxRoot Nodules

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Abstract
Kinnback, A., Mellor, R. B. and Werner, D. 1987. Alpha-mannosidase II isoenzyme in the peribacteroid space of Glycine max root nodules.—J. exp. Bot. 38: 1373–1377. Three isoenzymes of alpha-mannosidase from soybean tissue were separated by isoelectric focussing. The vacuomal isoenzymes I and II accounted typically for over 90% of the activity in extracts from roots whether or not they were infected with Bradyrhizobium japonicum, tissue culture and effective nodules. Ineffective nodules, on the other hand, contained up to 62% of the typically extracellular located isoenzyme III. The compartment between the symbiotic partners (the peribacteroid space) contained only isoenzyme II. The bearing of isoenzyme distribution upon models of peribacteroid membrane biogenesis is discussed.