Relation between binding free energy and solubility

In summary, the conversation discusses the relationship between binding free energy and solubility in a solvent medium. It is mentioned that the equilibrium constant for dissociation can be calculated from the free energy of binding, and that this is not only a question of energetics but also entropy. The equilibrium constant can be expressed using the equation K = exp(ΔG/RT).
  • #1
Chirag740
2
0
Suppose we have a ligand binding to a receptor in solvent medium. I am interested to know whether there is any relation between "Binding free energy" and "Solubility".

Extemely sorry if I posted my question in the wrong section. I'd be glad if anyone could help me out with this.

Regards,
Chirag V. Vora
Department of Pharmacoinformatics,
Block - A, Bioinformatics Infrastructure Facility,
National Institute of Pharmaceutical Education and Research (NIPER)
Sector 67, S.A.S. Nagar,
Punjab (INDIA) - 160 062
 
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  • #2
That's not only a question of energetics but even more of entropy.
The equilibrium constant for dissociation can be calculated from
[itex]\Delta G=\Delta H -T \Delta S \approx \Delta U -T \Delta S [/itex]
where [itex] \Delta U [/itex] is the dissociation energy per mole and in solution is practically equal to the enthalpy change,
and [itex] \Delta S [/itex] the entropic change due to dissociation.
The equilibrium constant K is
[itex] K=\exp(\Delta G/RT) [/itex]

Edit: Excuse me, I overread "free" in your post.
[itex] \Delta G[/itex] is the free energy of binding, so the relation is quite direct.
 

Related to Relation between binding free energy and solubility

1. What is binding free energy?

Binding free energy is a measure of the strength of the interaction between two molecules. It is the difference between the energy of the system when the molecules are bound together and when they are separated.

2. How is binding free energy related to solubility?

The binding free energy between a solute and a solvent is directly related to the solubility of the solute in that solvent. A higher binding free energy means a stronger interaction between the solute and the solvent, which leads to a higher solubility.

3. How can binding free energy be calculated?

Binding free energy can be calculated using various computational methods, such as molecular dynamics simulations or free energy calculations. These methods take into account the physical properties of the molecules involved and the environmental conditions to predict the strength of the binding interaction.

4. What factors influence the binding free energy-solubility relationship?

The chemical nature of the solute and solvent, temperature, pressure, and pH are all factors that can influence the binding free energy-solubility relationship. Additionally, the presence of other solutes or additives can also affect this relationship.

5. Why is understanding the relation between binding free energy and solubility important?

Understanding the relation between binding free energy and solubility is important in drug design and development, as well as in various industrial processes. It allows scientists to predict and optimize the solubility of a compound, which can impact its effectiveness and stability in a given environment.

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