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However, these predictions often have low accuracy and high uncertainty when identifying new active chemical scaffolds. Hence, a high proportion of retrieved compounds are not structurally novel. In this study, we proposed a strategy to address this issue by iteratively optimizing an evolutionary chemical binding similarity (ECBS) model using experimental validation data. Various data update and model retraining schemes were tested to efficiently incorporate new experimental data into ECBS models, resulting in a fine-tuned ECBS model with improved accuracy and coverage. To demonstrate the effectiveness of our approach, we identified the novel hit molecules for the mitogen-activated protein kinase kinase 1 (MEK1). These molecules showed sub-micromolar affinity (Kd 0.1\u20135.3\u00a0\u03bcM) to MEKs and were distinct from previously-known MEK1 inhibitors. We also determined the binding specificity of different MEK isoforms and proposed potential docking models. Furthermore, using de novo drug design tools, we utilized one of the new MEK inhibitors to generate additional drug-like molecules with improved binding scores. This resulted in the identification of several potential MEK1 inhibitors with better binding affinity scores. Our results demonstrated the potential of this approach for identifying novel hit molecules and optimizing their binding affinities.<\/jats:p>","DOI":"10.1186\/s13321-023-00760-6","type":"journal-article","created":{"date-parts":[[2023,9,23]],"date-time":"2023-09-23T06:01:44Z","timestamp":1695448904000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Iterative machine learning-based chemical similarity search to identify novel chemical inhibitors"],"prefix":"10.1186","volume":"15","author":[{"given":"Prasannavenkatesh","family":"Durai","sequence":"first","affiliation":[]},{"given":"Sue Jung","family":"Lee","sequence":"additional","affiliation":[]},{"given":"Jae Wook","family":"Lee","sequence":"additional","affiliation":[]},{"given":"Cheol-Ho","family":"Pan","sequence":"additional","affiliation":[]},{"given":"Keunwan","family":"Park","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,9,23]]},"reference":[{"issue":"4","key":"760_CR1","doi-asserted-by":"publisher","first-page":"688","DOI":"10.1016\/j.cell.2020.01.021","volume":"180","author":"JM Stokes","year":"2020","unstructured":"Stokes JM, Yang K, Swanson K, Jin W, Cubillos-Ruiz A, Donghia NM, MacNair CR, French S, Carfrae LA, Bloom-Ackermann Z et al (2020) A deep learning approach to antibiotic discovery. 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