Table 1.

Sugar-modulated control of cell-wall invertase in suspension cells

Culture	Invertase specific activity (%)
Suc-deficient
0 hr	0.770  ±  0.0054 (100)
12 hr	0.519  ±  0.042 (67.4)
24 hr	0.415  ±  0.058 (53.9)
48 hr	0.340  ±  0.035 (44.2)
72 hr	0.229  ±  0.011 (29.7)
Suc-deficient for 48 hr followed by 12 hr with sugar
+suc	0.576  ±  0.014 (74.8)
+D-Glc	0.507  ±  0.036 (65.8)
+3-O-mGlc	0.209  ±  0.041 (27.1)
+2-dGlc	0.292  ±  0.022 (37.9)

Values are means ± SD of three independent experiments (except for +2DG, for which the value represents the mean ± SD of two experiments); 0 hr represents a 7-day-old culture washed three times with suc-free medium. D-Glc, d-glucose. 

^*Micromoles of reducing sugars per milligram of protein per minute.