Table 2.

Modulation of the rate of zinc transfer from MT-2 to apo-SDH by GSH and GSSG

[GSH], mM	[GSSG], mM	[GSH]/[GSSG]	Rate constant,* M−1·s−1
0	3	0	81
0.375	3	0.125	101
0.75	3	0.25	120
1.2	3	0.4	183
1.5	3	0.5	204
3.0	3	1.0	187
6.0	3	2.0	203
1.5	0	—	30†
1.5	0.375	4.0	44
1.5	1.5	1.0	124
1.5	3.0	0.5	204

^*Rate constants were calculated as described in the legend of Table 1. 

^†The apparent slight activation noted here in comparison with the data in Table 1 is likely due to small amounts of GSSG formed in the 1.5 mM GSH solution.