Molecular dynamics simulations of CYP2E1.

Area of Science:

• Biochemistry
• Pharmacology
• Computational Chemistry

Background:

• Cytochrome P450 2E1 (CYP2E1) is vital for metabolizing diverse drugs, including many aromatic compounds.
• Understanding CYP2E1's catalytic mechanisms is key for drug development and predicting drug interactions.

Purpose of the Study:

• To investigate the molecular mechanisms by which CYP2E1 metabolizes various aromatic substrates.
• To elucidate the role of active site interactions and substrate mobility in CYP2E1 catalysis.

Main Methods:

• Docking of five representative aromatic substrates (benzene, aniline, acetaminophen, chlorzoxazone, theophylline) into the CYP2E1 X-ray structure.
• Performing 5 ns all-atom molecular dynamics simulations for each substrate-CYP2E1 complex.

Main Results:

• CYP2E1 active site primarily interacts with aromatic substrates via π-π stacking, facilitated by hydrophobic phenylalanine residues.
• Simulations revealed distinct substrate movements within the active site: small monocyclic substrates exhibit high rotation and limited translation.
• Substrate mobility correlates with the number of catalytic positions, with fewer positions leading to less movement.

Conclusions:

• The study provides insights into CYP2E1's catalytic mechanism for aromatic compounds.
• Findings highlight the importance of π-π stacking and substrate dynamics in CYP2E1 activity.
• This research can inform future mutagenesis studies and rational drug design targeting CYP2E1.