Table 3 The remaining percent activity of enzyme in the presence of metal ions.

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

nsP2 pro

AGA

AGC

AGG

Nickel

 Wild Type

46.50 ± 4.91

50.14 ± 7.61

53.26 ± 7.80

 Cys478Ala

50.77 ± 29.06

65.99 ± 42.26

76.73 ± 38.25

 Ser482Ala

59.79 ± 8.07

95.79 ± 7.42

92.02 ± 15.23

 Trp549Ala

75.05 ± 8.95

60.20 ± 9.80

37.35 ± 8.09

 Trp549Phe

89.49 ± 13.00

67.96 ± 14.34

67.00 ± 5.83

Copper

 Wild Type

82.65 ± 4.02

19.70 ± 8.70

77.41 ± 8.21

 Cys478Ala

103.6 ± 65.5

31.49 ± 20.18

87.71 ± 39.68

 Ser482Ala

86.42 ± 42.16

34.39 ± 8.24

112.6 ± 40.6

 Trp549Ala

83.09 ± 8.99

8.27 ± 2.39

68.68 ± 4.85

 Trp549Phe

81.46 ± 12.00

25.93 ± 1.97

60.33 ± 7.26

Cobalt

 Wild Type

200.0 ± 11.2

59.63 ± 0.75

119.3 ± 9.7

 Cys478Ala

313.8 ± 52.5

55.63 ± 8.71

114.0 ± 47.2

 Ser482Ala

103.1 ± 2.8

52.70 ± 3.06

123.1 ± 22.4

 Trp549Ala

161.98 ± 7.12

34.44 ± 11.43

140.67 ± 20.07

 Trp549Phe

283.39 ± 44.92

58.52 ± 6.21

150.07 ± 15.84

Magnesium

 Wild Type

83.03 ± 9.53

123.7 ± 44.4

111.2 ± 6.6

 Cys478Ala

152.4 ± 49.1

120.9 ± 18.0

121.2 ± 36.1

 Ser482Ala

105.6 ± 6.0

111.3 ± 8.7

107.9 ± 7.4

 Trp549Ala

97.10 ± 1.61

91.69 ± 5.82

92.07 ± 4.99

 Trp549Phe

108.84 ± 5.33

104.89 ± 2.92

93.33 ± 4.81

Zinc

 Wild Type

39.23 ± 26.94

38.76 ± 6.50

39.63 ± 11.55

 Cys478Ala

60.38 ± 44.37

44.25 ± 5.36

58.13 ± 50.61

 Ser482Ala

nd

21.61 ± 12.89

59.06 ± 11.04

 Trp549Ala

71.37 ± 5.84

55.59 ± 4.39

74.17 ± 12.27

 Trp549Phe

93.37 ± 2.65

48.88 ± 10.47

71.32 ± 13.34

  1. Percent remaining activity of protease compared to protease control with no metal present. Values are means ± S.D. with n ≥ 3. Nd indicates activity could not be detected, that is, complete inhibition.