ChemSpaceAL: An Efficient Active Learning Methodology Applied to Protein-Specific Molecular Generation
This work addresses the challenge of navigating vast chemical spaces in drug discovery for researchers, though it appears incremental as it builds on existing generative models with an active learning approach.
The paper tackles the problem of efficiently aligning generative models for drug discovery by developing an active learning methodology that requires evaluating only a subset of generated data, resulting in the model generating molecules similar to FDA-approved inhibitors for c-Abl kinase and reproducing two exactly, and being effective for proteins without known inhibitors like Cas9.
The incredible capabilities of generative artificial intelligence models have inevitably led to their application in the domain of drug discovery. Within this domain, the vastness of chemical space motivates the development of more efficient methods for identifying regions with molecules that exhibit desired characteristics. In this work, we present a computationally efficient active learning methodology that requires evaluation of only a subset of the generated data in the constructed sample space to successfully align a generative model with respect to a specified objective. We demonstrate the applicability of this methodology to targeted molecular generation by fine-tuning a GPT-based molecular generator toward a protein with FDA-approved small-molecule inhibitors, c-Abl kinase. Remarkably, the model learns to generate molecules similar to the inhibitors without prior knowledge of their existence, and even reproduces two of them exactly. We also show that the methodology is effective for a protein without any commercially available small-molecule inhibitors, the HNH domain of the CRISPR-associated protein 9 (Cas9) enzyme. We believe that the inherent generality of this method ensures that it will remain applicable as the exciting field of in silico molecular generation evolves. To facilitate implementation and reproducibility, we have made all of our software available through the open-source ChemSpaceAL Python package.