{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T17:11:04Z","timestamp":1760029864390,"version":"build-2065373602"},"reference-count":52,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2025,2,7]],"date-time":"2025-02-07T00:00:00Z","timestamp":1738886400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"CODECYT Project","award":["20220PGP18"],"award-info":[{"award-number":["20220PGP18"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Microorganisms"],"abstract":"<jats:p>Leishmania major is the etiological agent of cutaneous leishmaniasis (CL) in several countries in Asia and Northern Africa. The disease is considered a zoonotic infection where rodents are the reservoirs and phlebotomine sandflies are the vectors. Once inside the human body, the parasite multiplies inside the macrophages of infected patients, but the disease eventually cures spontaneously, leaving scars where the phlebotomine bites occurred. Given the importance of the replicative forms in the parasite\u2019s cell cycle, here, we decided to study the enzyme telomerase, which has the critical role of replenishing the chromosomal telomeric ends during cell replication. To this aim, we first conducted partial purification using Sephacryl-300 HR gel filtration, which allowed us to determine that the telomerase activity eluted as a 600 KDa complex. Second, we characterized an immunopurified L. major telomerase, and to try to explain some of our findings, we performed modeling studies using Alfa fold 3, Pyre2, and Swiss Protein Model. Finally, considering the similarity between the catalytic site of Leishmania and Homo sapiens telomerase, we decided to test typical inhibitors of human telomerase on the purified enzyme and promastigote cell forms, confirming that MST-312 and TMPYP4 efficiently inhibited L. major activity and arrested cell growth in Leishmania promastigotes. Our findings confirm the importance of telomerase activity in L. major\u2019s replicative forms and suggest the possibility of using drugs previously tested on human telomerase to treat CL.<\/jats:p>","DOI":"10.3390\/microorganisms13020357","type":"journal-article","created":{"date-parts":[[2025,2,7]],"date-time":"2025-02-07T05:04:33Z","timestamp":1738904673000},"page":"357","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Molecular and Structural Characterization of an Immunopurified Telomerase from Leishmania major and the Effect of Telomerase Inhibitors"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7293-5575","authenticated-orcid":false,"given":"Riward","family":"Campelo Morillo","sequence":"first","affiliation":[{"name":"Institute of Advanced Studies, Ministerio del Poder Popular para Ciencia y Tecnolog\u00eda (MINCYT), Caracas 1010, Venezuela"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4614-2894","authenticated-orcid":false,"given":"Liliana","family":"Casique","sequence":"additional","affiliation":[{"name":"Institute of Advanced Studies, Ministerio del Poder Popular para Ciencia y Tecnolog\u00eda (MINCYT), Caracas 1010, Venezuela"},{"name":"Departamento de Biolog\u00eda, Universidad Sim\u00f3n Bol\u00edvar, Caracas 1080, Venezuela"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3305-9167","authenticated-orcid":false,"given":"Katherine","family":"Figarella","sequence":"additional","affiliation":[{"name":"Institute of Advanced Studies, Ministerio del Poder Popular para Ciencia y Tecnolog\u00eda (MINCYT), Caracas 1010, Venezuela"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4732-9642","authenticated-orcid":false,"given":"Jos\u00e9 Luis","family":"Ram\u00edrez","sequence":"additional","affiliation":[{"name":"Institute of Advanced Studies, Ministerio del Poder Popular para Ciencia y Tecnolog\u00eda (MINCYT), Caracas 1010, Venezuela"},{"name":"Instituto de Biolog\u00eda Experimental, Universidad Central de Venezuela (UCV), Caracas 1040, Venezuela"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,2,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1191","DOI":"10.1016\/S0140-6736(98)10178-2","article-title":"Leishmaniasis","volume":"354","author":"Herwaldt","year":"1999","journal-title":"Lancet"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1171","DOI":"10.1111\/jdv.13220","article-title":"Unusual forms of cutaneous leishmaniasis due to Leishmania major","volume":"30","author":"Solomon","year":"2016","journal-title":"J. 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