1887

Abstract

An apparently novel 1,3-β-glucan synthase from the oomycete has been characterized. The enzyme exhibits properties that differ markedly from those of the enzyme previously described [Fèvre, M. & Dumas, C. (1977). 103, 297-306] as it is active at alkaline pH, stimulated by the divalent cations Ca, Mg and Mn, and appears to be located mainly in the apical part of the hypha. Taking into consideration the differences in pH optimum and effect of divalent ions, each enzyme activity could be assayed in the presence of the other. The insoluble polymeric product of the enzyme with alkaline pH optimum was characterized as a linear 1,3-β-glucan. Comparisons of the general properties of 1,3-β-glucan synthases suggest that enzymes from the oomycetes are more closely related to enzymes from higher plants than to those of true fungi, reflecting the fact that the oomycetes are highly divergent from chitinous fungi.

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1997-10-01
2024-03-28
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