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Both infections have challenging characteristics such as the formation of the resistant cysts in infected tissues, hampering the treatment and most usual diagnosis depending on time-consuming and\/or low sensitivity techniques. The use of monoclonal antibodies presents itself as an opportunity for the development of more effective alternative diagnostic methods, as well as an important and useful tool in the search for new therapeutic targets. This study investigated the possibility of using a previously produced monoclonal antibody (mAb3), as a diagnostic tool for the detection of <jats:italic>Acanthamoeba<\/jats:italic> trophozoites by direct and indirect flow cytometry and immunofluorescence. Immunoprecipitation assay and mass spectrometry allowed the isolation of the antibody's target and suggested it is a transporter part of the CPA (cation: proton antiporter) superfamily. <jats:italic>In vitro<\/jats:italic> tests indicate an important role of this target in <jats:italic>Acanthamoeba<\/jats:italic>'s encystment physiology. Our results support the importance of studying the role of CPA2 transporters in the context of acanthamoebiasis, as this may be a way to identify new therapeutic candidates.<\/jats:p>","DOI":"10.1017\/s0031182020001778","type":"journal-article","created":{"date-parts":[[2020,9,21]],"date-time":"2020-09-21T04:19:30Z","timestamp":1600661970000},"page":"1678-1688","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":13,"title":["<i>Acanthamoeba<\/i> spp. monoclonal antibody against a CPA2 transporter: a promising molecular tool for acanthamoebiasis diagnosis and encystment study"],"prefix":"10.1017","volume":"147","author":[{"given":"Michele 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