Determining the pharmacophore of a group of isosteres

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SUMMARY

The discussion centers on the pharmacophore determination of isosteres and clarifies the concept of Ki, which is the equilibrium dissociation constant for enzyme-inhibitor interactions. Ki is inversely related to the potency of an inhibitor; lower Ki values indicate more potent inhibitors. The binding interaction is represented by the equation E + I <--> EI, where E is the enzyme and I is the inhibitor. Understanding Ki is essential for evaluating drug efficacy in biochemistry.

PREREQUISITES
  • Basic knowledge of biochemistry, specifically enzyme kinetics.
  • Understanding of pharmacophore modeling and its significance in drug design.
  • Familiarity with the concept of binding constants and their implications in pharmacology.
  • Knowledge of isosteres and their role in medicinal chemistry.
NEXT STEPS
  • Research the methods for determining pharmacophores in drug design.
  • Study enzyme kinetics with a focus on the significance of Ki values.
  • Explore the role of isosteres in modifying drug potency and selectivity.
  • Learn about advanced techniques in computational chemistry for modeling enzyme-inhibitor interactions.
USEFUL FOR

Biochemists, medicinal chemists, pharmacologists, and researchers involved in drug discovery and development will benefit from this discussion.

mycotheology
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Heres the question:
http://img442.imageshack.us/img442/484/sarr.png
Firstly does anyone know what Ki is? Ionisation constant? I'm guessing its proportional to the drugs potency. I could take a good guess by observing the differences between each isostere but I'm guessing there's some kind of method I should be able to use here.
 
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In biochemistry, KI is the binding constant for an inhibitor. Put more precisely, in the binding interaction between an inhibitor I and enzyme E, which form enzyme-inhibitor complex EI:

E + I <--> EI

KI is the equilibrium dissociation constant for the binding reaction:

[tex]K_I = \frac{[E]<i>}{[EI]}</i>[/tex]

Therefore, more potent inhibitor have lower KI values.
 

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