Table 2.

Values of IC50 (micromolar) for proTWT, proTCC, proTY93A, and proTΔ154-167 for IgG aPS/PT and IgG aPT-A

VariableproTWTproTCCproTY93AproTΔ154-167Ratio (closed/open)
aPS/PT  
 P7 71 ± 10 >80 4.5 ± 0.8 4.5 ± 0.8 18 
 P13 >80 >80 4.1 ± 1.1 3.5 ± 0.8 19 
 P24 22.4 ± 5 25 ± 5 3.2 ± 0.9 2.8 ± 0.8 
aPT-A  
 P7 2.6 ± 0.5 2.4 ± 0.5 2.7 ± 0.4 1.2 ± 0.3 0.9 
 P13 3.8 ± 1.0 4.8 ± 1.1 3.7 ± 0.5 3.5 ± 0.5 1.3 
 P24 1.7 ± 0.3 1.5 ± 0.5 2.8 ± 0.3 2.5 ± 0.8 0.5 
VariableproTWTproTCCproTY93AproTΔ154-167Ratio (closed/open)
aPS/PT  
 P7 71 ± 10 >80 4.5 ± 0.8 4.5 ± 0.8 18 
 P13 >80 >80 4.1 ± 1.1 3.5 ± 0.8 19 
 P24 22.4 ± 5 25 ± 5 3.2 ± 0.9 2.8 ± 0.8 
aPT-A  
 P7 2.6 ± 0.5 2.4 ± 0.5 2.7 ± 0.4 1.2 ± 0.3 0.9 
 P13 3.8 ± 1.0 4.8 ± 1.1 3.7 ± 0.5 3.5 ± 0.5 1.3 
 P24 1.7 ± 0.3 1.5 ± 0.5 2.8 ± 0.3 2.5 ± 0.8 0.5 

Each titration was repeated twice, and the values of IC50 were determined by global fit using a simple binding equation (see "Materials and methods"). The ratio was calculated by divining the IC50 values of proTCC (closed) and proTY93A (open).