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Table 1 Characteristic kinetic constants for the hydrolysis of ATCh and BTCh by DmAChE, HuAChE and HuBChE

From: Evidence for inhibition of cholinesterases in insect and mammalian nervous systems by the insect repellent deet

 

DmAChE (ATCh)

HuAChE (ATCh)

HuBChE (BTCh)

Substrate

   

k 3 [s-1]

395.4

13471 ± 2171

1082 ± 44

K ip [mM]

0.17

5.43 ± 1.0

11.3 ± 0.5

K L

4.17

0.0181 ± 0.0054

0.0019 ± 0.0008

K LL

179

9.23 ± 6.58

12.3 ± 5.4

k 2 [s-1]

53465

14375 ± 2182

420 ± 20

A

3.44

1.64 ± 0.36

1.32 ± 0.07

B

0.049

0.11 ± 0.03

39.6 ± 13.5

K s = K p *K L [mM]

0.73

0.098

0.021

K ss = K p *K LL [mM]

31.1

50.1

139

DEET

   

K ip [mM]

1.02 ± 0.03

8.39 ± 6.97

0.37 ± 0.05

K iL

 

0.083 ± 0.078

1.54 ± 0.45

K iLL

 

0.56 ± -0.41

29 ± 5.4

c

 

1.49 ± 0.99

1.32

d

 

0.19 ± 0.18

0.52 ± 0.09

K is = K ip *K iL [mM]

 

0.69

0.57

K iss = K ip *K iLL [mM]

 

4.67

1.08

  1. ATCh = acetylthiocholine; BTCh = butyrylthiocholine; DmAChE = Acetylcholinesterase from D. melanogaster; HuAChE = Acetylcholinesterase from human; HuBChE = Butyrylcholinesterase from human.