A one-to-one protein (P)-ligand (L) complexation (P + L <-> PL) has a equilibrium constant (Kd) value of 100 nM at 25°C, and the Kd remains the same at 37°C.

Biochemistry
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Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
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Chapter1: Biochemistry: An Evolving Science
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A one-to-one protein (P)-ligand (L) complexation (P + L <-> PL) has a dissociation
equilibrium constant (Kd) value of 100 nM at 25°C, and the Kd remains the same at 37°C.
1) What is AS of binding at 25°C? Assume ACp of the binding is 0 over the temperature
range.
AS = 1.34E2
kJ/(mol*K) (note the unit!!) (sig. fig =3)
2) What is the concentration of the PL complex formed at equilibrium when you mix 0.20
uM (microM) of Protein and 1.0 uM of Ligand together at 37°C?
PL at equilibrium = 8.1E-1
uM (note the unit!!) (sig. fig =2)
Transcribed Image Text:A one-to-one protein (P)-ligand (L) complexation (P + L <-> PL) has a dissociation equilibrium constant (Kd) value of 100 nM at 25°C, and the Kd remains the same at 37°C. 1) What is AS of binding at 25°C? Assume ACp of the binding is 0 over the temperature range. AS = 1.34E2 kJ/(mol*K) (note the unit!!) (sig. fig =3) 2) What is the concentration of the PL complex formed at equilibrium when you mix 0.20 uM (microM) of Protein and 1.0 uM of Ligand together at 37°C? PL at equilibrium = 8.1E-1 uM (note the unit!!) (sig. fig =2)
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