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. 2021 Jan 13;30(3):597–612. doi: 10.1002/pro.4017

TABLE 3.

Thermodynamics properties for Cu(II) binding to wtPAI‐1 and variants at 10°C

PAI‐1 variant Model (n) K obs, M−1 K d a ΔG obs, (kcal/Mol) b ΔH obs , (kcal/mol) −TΔS obs, (kcal/Mol) c
Active wt 1 1.9 (±0.9) × 107 59.5 (±27.6) nM −9.4 (±0.3) −17.1 (±0.1) 7.7 (±0.3)
Latent wt 2

1.9 (±0.2) × 107

1.7 (±1.0) × 104

52.0 (±7.1) nM

73.6 (±45.6) μM

−9.4 (±0.1)

−5.4 (±0.4)

−12.1 (±0.1)

−12.9 (±1.0)

2.6 (±0.1)

7.5 (±0.6)

Active H10A 1 1.2 (±0.3) × 107 87.8 (±23.3) nM −9.2 (±0.2) −18.4 (±0.1) 9.3 (±0.2)
Latent H10A 2

1.5 (±0.6) × 107

2.3 (±1.3) × 104

74.6 (±32.3) nM

36.0 (±7.5) μM

−9.3 (±0.3)

−5.6 (±0.4)

−11.9 (±0.1)

−24.2 (±4.6)

2.6 (±0.2)

18.6 (±4.2)

Active E81A 2

5.7 (±0.9) × 107

2.5 (±1.8) × 104

17.0 (±2.8) nM

53.7 (±39.1) μM

−10.1 (±0.1)

−5.6 (±0.5)

−17.5 (±0.1)

−15.7 (±5.6)

7.4 (±0.1)

10.1 (±5.2)

Latent E81A 2

2.8 (±0.1) × 107

1.2 (±0.1) × 104

36.0 (±0.1) nM

83.0 (±7.8) μM

−9.6 (±0.1)

−5.3 (±0.1)

−14.7 (±1.0)

−15.3 (±2.0)

5.0 (±1.0)

10.1 (±2.1)

Active H364A 1 3.5 (±1.2) × 105 3.0 (±1.0) μM −7.3 (±0.2) −33.1 (±3.8) d 25.4 (±4.4) d
Latent H364A 1 4.8 (±0.7) × 104 21.2 (±3.3) μM −6.1 (±0.1) −43.9 (±8.6) d 37.8 (±8.7) d
Active H2AH3A e 1 4.2 (±0.9) × 104 24.0 (±5.0) μM −6.0 (±0.1) −20.0 (±12.0) d 14.0 (±12.0) d
Latent H2AH3A e 1 7.7 (±4.6) × 104 13.0 (±6.0) μM −6.3 (±0.4) −16.4 (±0.6) d 10.0 (±0.4) d
a

K d calculated from the following relationship: Kd = 1/Kobs.

b

ΔG ob s calculated from ΔGobs = −RT ln Kobs.

c

TΔS obs term calculated from ΔGobs = ΔHobs − TΔSobs.

d

Parameters measured at the low sensitivity limit of the ITC and likely have significant error associated with them.

e

Values previously published (Bucci JC, McClintock CS, Chu Y, Ware GL, McConnell KD, Emerson JP, Peterson CB (2017) J Biol Inorg Chem 22 (7):1123–1,135).