Structural and electronic properties of tyrosine kinases inhibitors

Area of Science:

• Biochemistry
• Computational Chemistry
• Pharmacology

Background:

• Protein tyrosine kinases (TKs) are crucial regulators of cellular processes, and their dysregulation is linked to diseases like cancer.
• Receptor tyrosine kinases (RTKs) and intracellular TKs are implicated in various pathologies, including cancer, atherosclerosis, and psoriasis.
• Understanding the molecular basis of TK inhibition is vital for drug development.

Purpose of the Study:

• To investigate the relationship between molecular properties and the inhibitory activity of EGF-receptor inhibitors.
• To identify key molecular parameters that dictate the potency of these inhibitors.
• To provide insights for the rational design of novel TK-targeting drugs.

Main Methods:

• Theoretical study using RHF/6-311G* level of theory.
• Selection of structurally related ATP-binding site inhibitors of EGF-receptors.
• Evaluation of molecular properties including ionization potentials, E(HOMO)-E(LUMO) energy gap, and atomic charges.

Main Results:

• Species stability, indicated by ionization potentials and E(HOMO)-E(LUMO) energy gap, showed a strong positive correlation with inhibitory potency (IP).
• The most potent inhibitors exhibited high ionization potentials, high energy gaps, and negative charges on specific carbon atoms (C6 and C7).
• A significant correlation was observed between molecular parameters (IP, dipole moment, energy gap) and inhibitory potency.

Conclusions:

• Molecular properties such as ionization potential, dipole moment, and E(HOMO)-E(LUMO) energy gap are critical determinants of inhibitory activity against EGF-receptors.
• These parameters play a significant role in the interaction of inhibitors with the ATP-binding site of EGF-receptors.
• The findings support the use of computational methods to predict and design effective TK inhibitors for therapeutic applications.