Protein language model-generated enzyme sequences exhibit high stability in molecular dynamics simulations

Introduction: Large Language Models (LLMs) have transformed protein engineer- ing by capturing complex sequence patterns from large datasets, enabling appli- cations such as structure prediction and functional annotation. Finenzyme applies conditional transfer learning to generate biologically plausible enzyme sequences conditioned on Enzyme Commission (EC) numbers. Methods: In this work, we extended Finenzyme with an in silico selection pipe- line that first identifies generated sequences most likely to preserve or enhance the functional characteristics of specific EC categories and then evaluates them through molecular dynamics (MD) simulations to assess their structural stability and conformational dynamics. Results: MD simulations of 236 Finenzyme-generated enzymes across four EC classes (59 μs total simulation time) confirmed high structural stability. Across all enzyme classes, 74-95% of the models maintained stable tertiary structures and correct folding throughout the trajectories, with 195 out of 236 structures (82.6%) exhibiting sustained stability. Discussion: By combining conditional pre-trained language model fine-tun- ing with dynamic structural evaluation, our framework advances beyond static sequence-based predictions to address the structural and functional dimensions of enzyme behavior, key aspects for both biomedical and industrial applications.