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However, technical limitations severely influence the number and certainty of observed water molecules in 3D structures. This may compromise the accuracy of further structural studies such as docking calculations or molecular dynamics simulations. Here we present HomolWat, a web application for incorporating water molecules into GPCR structures by using template-based modelling of homologous water molecules obtained from high-resolution structures. While there are various tools available to predict the positions of internal waters using energy-based methods, the approach of borrowing lacking water molecules from homologous GPCR structures makes HomolWat unique. The tool can incorporate water molecules into a protein structure in about a minute with around 85% of water recovery. The web server is freely available at http:\/\/lmc.uab.es\/homolwat.<\/jats:p>","DOI":"10.1093\/nar\/gkaa440","type":"journal-article","created":{"date-parts":[[2020,5,15]],"date-time":"2020-05-15T16:44:12Z","timestamp":1589561052000},"page":"W54-W59","source":"Crossref","is-referenced-by-count":34,"title":["HomolWat: a web server tool to incorporate \u2018homologous\u2019 water molecules into GPCR structures"],"prefix":"10.1093","volume":"48","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3120-8667","authenticated-orcid":false,"given":"Eduardo","family":"Mayol","sequence":"first","affiliation":[{"name":"Unitat de Bioestadistica, Facultat de Medicina, Universitat Aut\u00f2noma de Barcelona, Bellaterra 08193, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7143-9075","authenticated-orcid":false,"given":"Adri\u00e1n","family":"Garc\u00eda-Recio","sequence":"first","affiliation":[{"name":"Unitat de Bioestadistica, Facultat de Medicina, Universitat Aut\u00f2noma de Barcelona, Bellaterra 08193, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7551-6245","authenticated-orcid":false,"given":"Johanna K S","family":"Tiemann","sequence":"first","affiliation":[{"name":"Institute of Medical Physics and Biophysics, Medical University Leipzig, Leipzig, Sachsen 04107, Germany"},{"name":"Institute of Medical Physics and Biophysics, Charit\u00e9 Universit\u00e4tsmedizin Berlin, Berlin 101179, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0063-1104","authenticated-orcid":false,"given":"Peter W","family":"Hildebrand","sequence":"first","affiliation":[{"name":"Institute of Medical Physics and Biophysics, Medical University Leipzig, Leipzig, Sachsen 04107, Germany"},{"name":"Institute of Medical Physics and Biophysics, Charit\u00e9 Universit\u00e4tsmedizin Berlin, Berlin 101179, Germany"},{"name":"Berlin Insitute of Health (BIH), 10178 Berlin, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0397-9800","authenticated-orcid":false,"given":"Ramon","family":"Guix\u00e0-Gonz\u00e1lez","sequence":"first","affiliation":[{"name":"Laboratory of Biomolecular Research, Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland"},{"name":"Condensed Matter Theory Group, Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6035-3399","authenticated-orcid":false,"given":"Mireia","family":"Olivella","sequence":"first","affiliation":[{"name":"Bioinformatics and Medical Statistics Group, University of Vic-Central University of Catalonia, Barcelona 08500, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3848-2928","authenticated-orcid":false,"given":"Arnau","family":"Cordom\u00ed","sequence":"first","affiliation":[{"name":"Unitat de Bioestadistica, Facultat de Medicina, Universitat Aut\u00f2noma de Barcelona, Bellaterra 08193, Spain"}]}],"member":"286","published-online":{"date-parts":[[2020,6,2]]},"reference":[{"key":"2020062614044635600_B1","doi-asserted-by":"crossref","first-page":"51","DOI":"10.1016\/j.pharmthera.2014.02.004","article-title":"Unifying family A GPCR theories of activation","volume":"143","author":"Tehan","year":"2014","journal-title":"Pharmacol. 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