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Here we present reparametrisations of the force fields for the core molecules from 9 different <jats:inline-formula><jats:alternatives><jats:tex-math>$$\\beta$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mi>\u03b2<\/mml:mi>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>-lactam classes, for which we utilized the force field Toolkit and Gaussian calculations. We focus on the parametrisation of the dihedral angles, with the goal of reproducing the optimised quantum geometry in MD simulations. Parameters taken from CGenFF turn out to be a good initial guess for the multiplicity of each dihedral angle, but the key to a successful parametrisation is found to lie in the phase shifts. Based on the optimised quantum geometry, we come up with a strategy for predicting the phase shifts prior to the dihedral potential fitting. This allows us to successfully parameterise 8 out of the 11 molecules studied here, while the remaining 3 molecules can also be parameterised with small adjustments. Our work highlights the importance of predicting the dihedral phase shifts in the ligand parametrisation protocol, and provides a simple yet valuable strategy for improving the process of parameterising force fields of drug-like molecules.<\/jats:p>","DOI":"10.1007\/s10822-022-00464-3","type":"journal-article","created":{"date-parts":[[2022,7,12]],"date-time":"2022-07-12T11:03:06Z","timestamp":1657623786000},"page":"537-547","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["On the force field optimisation of $$\\beta$$-lactam cores using the force field Toolkit"],"prefix":"10.1007","volume":"36","author":[{"given":"Qiyang","family":"Wu","sequence":"first","affiliation":[]},{"given":"Tianyang","family":"Huang","sequence":"additional","affiliation":[]},{"given":"Songyan","family":"Xia","sequence":"additional","affiliation":[]},{"given":"Frank","family":"Otto","sequence":"additional","affiliation":[]},{"given":"Tzong-Yi","family":"Lee","sequence":"additional","affiliation":[]},{"given":"Hsien-Da","family":"Huang","sequence":"additional","affiliation":[]},{"given":"Ying-Chih","family":"Chiang","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2022,7,11]]},"reference":[{"key":"464_CR1","doi-asserted-by":"publisher","first-page":"226","DOI":"10.1038\/nrmicro.2017.169","volume":"16","author":"SJ Quillin","year":"2018","unstructured":"Quillin SJ, Seifert HS (2018) Neisseria gonorrhoeae host adaptation and pathogenesis. 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