Deciphering the Atomic Mechanisms of Third-Generation Bisteric mTOR Inhibitors through Comparative Microsecond...

Area of Science:

• Biochemistry
• Molecular Biology
• Pharmacology

Background:

• The mammalian target of rapamycin (mTOR) is crucial for cell growth and a significant target in cancer therapy.
• Existing mTOR inhibitors face challenges due to resistance mutations.
• Third-generation bisteric inhibitors offer a potential solution by targeting both allosteric and orthosteric sites.

Purpose of the Study:

• To elucidate the atomic mechanisms of third-generation bisteric inhibitors targeting mTOR.
• To understand the role of linker design in the efficacy of these inhibitors.
• To provide insights for designing next-generation mTOR inhibitors.

Main Methods:

• Microsecond molecular dynamics simulations were employed.
• Six mTOR-bisteric inhibitor complexes were analyzed.
• Binding affinity and conformational stability were assessed.

Main Results:

• Bisteric inhibitors were found to stabilize the mTOR catalytic cleft.
• Inhibitor potency correlated positively with the degree of cleft closure.
• Optimal linker length was identified as critical for promoting a closed and stable mTOR conformation, thereby enhancing binding affinity.

Conclusions:

• Atomic-level insights into mTOR-bisteric inhibitor interactions were gained.
• Linker design is a key factor in optimizing the efficacy of mTOR inhibitors.
• These findings can guide the rational design of novel mTOR-targeted cancer therapies.