High-Resolution Molecular-Dynamics Simulations of the Pyruvate Kinase Muscle Isoform 1 and 2 (PKM1/2).

Area of Science:

• Biochemistry
• Structural Biology
• Computational Biology

Background:

• Glucose metabolism is crucial for cell function and cancer progression.
• Pyruvate kinase (PK) catalyzes the final step of glycolysis, with PKM1 and PKM2 isoforms having distinct roles.
• PKM2 is highly expressed in proliferating tumor cells, making it a target for anticancer drug development.

Purpose of the Study:

• To elucidate the structural dynamics of PKM1 and PKM2 using advanced simulation techniques.
• To identify potential drug targets by analyzing substrate and activator binding sites.
• To understand PKM2-specific allostery and cryptic pocket formation for novel therapeutic strategies.

Main Methods:

• Extensive high-resolution molecular dynamics (MD) simulations exceeding 6 μs.
• Adaptive sampling techniques coupled with the polarizable AMOEBA force field.
• Analysis of all PKM2 oligomerization states and biologically active PKM1.

Main Results:

• Detailed structural insights into PKM1 and PKM2, including comparisons of Fructose Bi-Phosphate (FBP) binding.
• Analysis of the pharmacological activator TEPP-46 binding to PKM2, highlighting structural similarities and differences.
• Identification of potential new cryptic pockets specific to PKM2, offering novel drug targeting opportunities.

Conclusions:

• The study provides unprecedented structural dynamics of PKM1 and PKM2, crucial for understanding their roles in cancer.
• Identified structural features and cryptic pockets in PKM2 offer promising avenues for developing targeted anticancer therapies.
• These findings advance the design of novel molecules with potential antitumoral activity.