Exploring the Conformational Space of MPS1 Kinase Using Metadynamics

Area of Science:

• Molecular biology
• Biochemistry
• Structural biology

Background:

• Monopolar spindle 1 (MPS1) kinase is a dual specificity kinase vital for the spindle assembly checkpoint during cell division.
• Overexpression of MPS1 kinase is observed in various cancers, presenting a therapeutic target.
• Current drug discovery efforts targeting MPS1 kinase have not yielded clinically successful candidates.

Purpose of the Study:

• To explore the conformational landscape of MPS1 kinase beyond the known DFG "in" state.
• To identify alternative conformations and transition states for structure-based drug design.
• To understand the role of phosphorylation in MPS1 kinase conformational dynamics.

Main Methods:

• Well-tempered metadynamics simulations were utilized to investigate MPS1 kinase's conformational space.
• Simulations were initiated from the experimentally determined DFG "in" conformation.
• Analysis focused on identifying key stabilizing interactions and the impact of phosphorylation.

Main Results:

• The simulations successfully predicted the DFG "out" conformation of MPS1 kinase.
• Key transition states between different conformations were identified.
• Crucial interactions stabilizing various MPS1 kinase conformations were elucidated.
• The influence of phosphorylation on MPS1 kinase conformation was determined.

Conclusions:

• Exploring alternative conformations of MPS1 kinase, such as the DFG "out" state, is critical for developing novel inhibitors.
• Understanding MPS1 kinase's conformational dynamics and the role of phosphorylation provides insights for structure-based drug design.
• This study offers a foundation for designing more effective MPS1 kinase inhibitors for cancer therapy.