Table 1 The kinetic parameters for nsP2 pro Wild Type and mutants.

From: Chikungunya nsP2 protease is not a papain-like cysteine protease and the catalytic dyad cysteine is interchangeable with a proximal serine

nsP2 pro

kcat (×10−4 s−1)

Km (μM)

kcat/Km (×10−4 s−1∙μM−1)

Substrate AGA

 Wild Type

46.16 ± 8.91

65.73 ± 17.08

0.722 ± 0.151

 Cys478Ala

5.150 ± 1.533

3.293 ± 1.048

1.572 ± 0.197

 Ser482Ala

16.35 ± 2.91

10.40 ± 2.02

1.637 ± 0.541

 Trp549Ala

32.47 ± 7.61

30.14 ± 9.84

1.04 ± 0.35

 Trp549Phe

7.59 ± 4.40

4.14 ± 2.02

1.77 ± 0.18

Substrate AGC

 Wild Type

24.21 ± 4.86

6.957 ± 1.607

3.614 ± 1.106

 Cys478Ala

31.49 ± 12.71

18.43 ± 16.73

2.417 ± 1.220

 Ser482Ala

21.25 ± 11.55

10.92 ± 2.80

1.871 ± 0.577

 Trp549Ala

74.89 ± 12.84

7.66 ± 4.56

11.57 ± 5.20

 Trp549Phe

12.66 ± 0.53

4.09 ± 1.56

3.36 ± 1.09

Substrate AGG

 Wild Type

16.06 ± 11.45

8.618 ± 5.027

1.792 ± 0.431

 Cys478Ala

15.07 ± 7.70

7.172 ± 3.435

2.243 ± 0.854

 Ser482Ala

14.33 ± 6.52

5.807 ± 3.646

3.080 ± 1.598

 Trp549Ala

16.65 ± 12.39

26.87 ± 9.67

0.67 ± 0.48

 Trp549Phe

13.43 ± 1.66

7.59 ± 1.28

1.79 ± 0.24

  1. The kinetic results are represented as mean ± S.D. for at least 3 independent experiments.