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Nucleotide effects on glucan-synthesis activities of particulate enzymes from Saprolegnia
Vol. 159, No. 2 (1983), pp. 130-135
Published by: Springer
Stable URL: http://www.jstor.org/stable/23377046
Page Count: 6
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Membrane-bound β-1-3- and β-1-4-glucan synthetases of Saprolegnia are affected in vitro by the presence of nucleotides. Both enzymatic activities are inhibited by uridine nucleotides. Guanosine 5′-triphosphate and ATP reduce β-1-3-glucan synthesis but stimulate β-1-4-glucan production; they also increase Vmax without effect on the Km for uridine 5′-diphosphate glucose. The stimulation by ATP could be the result of an activation or stabilization of the enzymes and might have implications for cell-wall construction during hyphal growth.
Planta © 1983 Springer