Comparative docking studies of CYP1b1 and its PCG-associated mutant forms

Area of Science:

• Biochemistry
• Molecular Biology
• Structural Biology

Background:

• The human CYP1B1 protein is crucial for enzyme catalysis.
• Mutations in CYP1B1 are associated with various diseases.
• Previous studies suggest mutations can destabilize functionally important protein regions.

Purpose of the Study:

• To investigate the binding modes of oestradiol with wild-type and mutant human CYP1B1.
• To understand how disease-associated mutations affect protein-ligand interactions and enzyme function.

Main Methods:

• Molecular docking simulations were performed.
• Receptor structures were derived from molecular dynamics simulations of homology models.
• Comparison of binding interactions between wild-type and mutant CYP1B1 proteins.

Main Results:

• Mutant CYP1B1 proteins exhibited altered protein-ligand interactions compared to the wild-type.
• Changes in substrate-binding region geometry and haem positioning were observed in mutants.
• A key difference was the loss or weakening of stacking interactions with phenyl residues in mutants.

Conclusions:

• Disease mutations in CYP1B1 significantly alter oestradiol binding interactions.
• These alterations in molecular function at the active site contribute to the deleterious nature of these mutations.
• The study provides molecular insights into the functional impact of CYP1B1 disease mutations.