Molecular Dynamics of Beta-Lactamase Enzymes

Beta-lactamase enzymes are a principal mechanism by which bacteria deactivate beta-lactam antibiotics, undermining treatments for a range of infections. Molecular dynamics approaches have become indispensable for probing the motions and conformational changes that underpin enzyme function, substrate recognition and inhibitor binding. By simulating atomic trajectories over time, researchers can characterise transient states of the active site, explore the pathways of acylation and deacylation, and identify distal networks of residues that modulate catalytic efficiency. Such insights inform the design of novel therapeutics that either stabilise inactive conformations or exploit structural vulnerabilities to induce misfolding. The global antibiotic resistance crisis lends urgency to these efforts, as understanding the dynamic landscape of serine and metallo-beta-lactamases is critical for developing next-generation inhibitors and extending the clinical utility of existing drugs.

Research from Nature Portfolio

Recent studies have demonstrated that certain beta-lactamases exhibit a natural propensity to aggregate under selective pressure, a feature that can be exploited to counter resistance. Synthetic peptides known as Pept-Ins have been designed to bind unfolding intermediates of diverse beta-lactamases, redirecting them into non-functional inclusion bodies and thereby restoring antibiotic susceptibility in resistant clinical isolates. This strategy targets the structural weaknesses revealed by molecular simulations and evolutionary analyses of active-site regions. Other work has employed deep mutational scanning coupled with high-throughput sequencing to map the sequence requirements of the CTX-M family of enzymes for hydrolysing different beta-lactam substrates. By analysing how individual active-site residues influence the dynamics of the omega loop and substrate positioning, researchers have identified key determinants of spectrum specificity and revealed that subtle alterations in loop flexibility can dramatically shift the hydrolytic profile of extended-spectrum cephalosporinases.

Molecular Dynamics of Beta-Lactamase Enzymes publication trend

The graph below shows the total number of articles in molecular dynamics of beta-lactamase enzymes across all publications each year (not limited to Nature Index journals).

Technical terms

Molecular dynamics simulation: Computational method that calculates the time-dependent behaviour of a molecular system by integrating Newton’s equations of motion.

Acyl-enzyme intermediate: A covalent complex formed between the enzyme’s active-site serine and the beta-lactam ring during hydrolysis.

Deacylation: The hydrolytic step that resolves the acyl-enzyme intermediate, restoring the free enzyme and releasing the inactivated antibiotic.

Ω-loop: A flexible segment of the enzyme near the active site whose conformation influences substrate binding and catalytic efficiency.

Quantum mechanics/molecular mechanics (QM/MM): Hybrid computational approach that treats the reactive region quantum-mechanically and the surrounding protein by classical force fields.

Non-equilibrium molecular dynamics: Simulation strategy that perturbs the system away from equilibrium to reveal communication pathways and conformational transitions.

Tautomer: One of two or more isomeric forms of a molecule that differ by the position of a proton and a double bond, affecting reactivity in enzyme intermediates.

References

1. Exploiting the aggregation propensity of beta-lactamases to design inhibitors that induce enzyme misfolding. Nature Communications (2023).
2. Mapping the determinants of catalysis and substrate specificity of the antibiotic resistance enzyme CTX-M β-lactamase. Communications Biology (2023).
3. Tautomer-Specific Deacylation and Ω‑Loop Flexibility Explain the Carbapenem-Hydrolyzing Broad-Spectrum Activity of the KPC‑2 β‑Lactamase. Journal of the American Chemical Society (2023).
4. Electric Fields Are a Key Determinant of Carbapenemase Activity in Class A β‑Lactamases. ACS Catalysis (2024).
5. Dynamical responses predict a distal site that modulates activity in an antibiotic resistance enzyme. Chemical Science (2024).