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Molecular similarity has been measured by a variety of methods including molecular descriptor based similarity, common molecular fragments, graph matching and 3D methods such as shape matching. Similarity measures are widespread in practice and have proven to be useful in drug discovery. Because of our interest in electrostatics and high throughput ligand-based virtual screening, we sought to exploit the information contained in atomic coordinates and partial charges of a molecule.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A new molecular descriptor based on partial charges is proposed. It uses the autocorrelation function and linear binning to encode all atoms of a molecule into two rotation-translation invariant vectors. Combined with a scoring function, the descriptor allows to rank-order a database of compounds versus a query molecule. The proposed implementation is called<jats:sc>ACPC<\/jats:sc>(AutoCorrelation of Partial Charges) and released in open source. Extensive retrospective ligand-based virtual screening experiments were performed and other methods were compared with in order to validate the method and associated protocol.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>While it is a simple method, it performed remarkably well in experiments. At an average speed of 1649 molecules per second, it reached an average median area under the curve of 0.81 on 40 different targets; hence validating the proposed protocol and implementation.<\/jats:p><\/jats:sec>","DOI":"10.1186\/1758-2946-6-23","type":"journal-article","created":{"date-parts":[[2014,5,10]],"date-time":"2014-05-10T13:01:47Z","timestamp":1399726907000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["A rotation-translation invariant molecular descriptor of partial charges and its use in ligand-based virtual screening"],"prefix":"10.1186","volume":"6","author":[{"given":"Francois","family":"Berenger","sequence":"first","affiliation":[]},{"given":"Arnout","family":"Voet","sequence":"additional","affiliation":[]},{"given":"Xiao Yin","family":"Lee","sequence":"additional","affiliation":[]},{"given":"Kam YJ","family":"Zhang","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2014,5,10]]},"reference":[{"key":"598_CR1","doi-asserted-by":"publisher","first-page":"3204","DOI":"10.1039\/b409813g","volume":"2","author":"A Bender","year":"2004","unstructured":"Bender A, Glen RC: Molecular similarity: a key technique in molecular informatics. 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