Table 3.
The EC50 values of ADPR for the mutants in the NUDT9-H domain of TRPM2
MutantsEC50 ± SEM Hill slope
 µM  
WT 40.5 ± 4.5 2.6  
H1346A NF NA  
H1346W 112.5 ± 6.4 2.0  
T1347A NF NA  
T1347F 92.9 ± 11.2 1.2  
T1347Y 115.1 ± 13.4 1.3  
Y1349A NF NA  
Y1349I >10 mM NA  
L1379A ND NA  
L1379S 10.8 ± 3.5 1.0  
S1391A 3.5 ± 0.2 2.7  
E1409A 506.3 ± 108.7 1.5  
E1409Q 5.4 ± 1.6 1.6  
D1431A NF NA  
D1431N >100 mM NA  
R1433A NF NA  
R1433K NF NA  
R1433G >10 mM NA  
L1484V ND NA  
H1488A NF NA  
H1488F >10 mM NA  
MutantsEC50 ± SEM Hill slope
 µM  
WT 40.5 ± 4.5 2.6  
H1346A NF NA  
H1346W 112.5 ± 6.4 2.0  
T1347A NF NA  
T1347F 92.9 ± 11.2 1.2  
T1347Y 115.1 ± 13.4 1.3  
Y1349A NF NA  
Y1349I >10 mM NA  
L1379A ND NA  
L1379S 10.8 ± 3.5 1.0  
S1391A 3.5 ± 0.2 2.7  
E1409A 506.3 ± 108.7 1.5  
E1409Q 5.4 ± 1.6 1.6  
D1431A NF NA  
D1431N >100 mM NA  
R1433A NF NA  
R1433K NF NA  
R1433G >10 mM NA  
L1484V ND NA  
H1488A NF NA  
H1488F >10 mM NA  

NA, not applicable; ND, EC50 value is not significantly different from the WT, based on the measurements of currents induced by EC10 and EC90 concentrations of ADPR; NF, EC50 value is not defined because the mutation fails to yield a saturated response even at millimolar concentrations of ADPR.

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