Table 2 ITC analysis of acetyl-CoA, CoA, PEA, and Ac-PEA binding against Dat.

From: An essential role of acetyl coenzyme A in the catalytic cycle of insect arylalkylamine N-acetyltransferase

Group*

In syringe

In sample cell

N

Kd (μM)

ΔH (kcal/mol)

−TΔS** (kcal/mol)

ΔG*** (kcal/mol)

Ligand

Protein

a

Ac-CoA

Dat

1.11

5.51 ± 1.92

−12.33 ± 2.37

5.09 ± 2.29

−7.24 ± 0.25

b

CoA

Dat

1.11

152.89 ± 26.48

−9.35 ± 1.43

4.12 ± 1.46

−5.23 ± 0.10

c

Ac-CoA

Dat/CoA/Ac-PEA

1.86

70.7 ± 9.90

1.38 ± 0.11

−7.06 ± 0.16

−5.67 ± 0.08

d

PEA

Dat/CoA/Ac-PEA

cannot be determined

  1. *Groups a–d corresponded to Fig. 5a–d.
  2. **TΔS – entropy variation; calculated from the equation ΔG = ΔH – TΔS.
  3. ***ΔG values were calculated using the equation ΔG = − RTlnKa.
  4. All values correspond to the mean of experiments repeated with n = 6 biologically independent experiments.
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