{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,11]],"date-time":"2026-02-11T20:32:56Z","timestamp":1770841976343,"version":"3.50.1"},"reference-count":28,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2022,10,19]],"date-time":"2022-10-19T00:00:00Z","timestamp":1666137600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"INIFAP","award":["1172635360"],"award-info":[{"award-number":["1172635360"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Genes"],"abstract":"<jats:p>Fasciola hepatica anthelmintic resistance may be associated with the catalytic activity of xenobiotic metabolizing enzymes. The gene expression of one of these enzymes, identified as carboxylesterase B (CestB), was previously described as inducible in adult parasites under anthelmintic treatment and exhibited a single nucleotide polymorphism at position 643 that translates into a radical amino acid substitution at position 215 from Glutamic acid to Lysine. Alphafold 3D models of both allelic sequences exhibited a significant affinity pocket rearrangement and different ligand-docking modeling results. Further bioinformatics analysis confirmed that the radical amino acid substitution is located at the ligand affinity site of the enzyme, affecting its affinity to serine hydrolase inhibitors and preferences for ester ligands. A field genotyping survey from parasite samples obtained from two developmental stages isolated from different host species from Argentina and Mexico exhibited a 37% allele distribution for 215E and a 29% allele distribution for 215K as well as a 34% E\/K heterozygous distribution. No linkage to host species or geographic origin was found in any of the allele variants.<\/jats:p>","DOI":"10.3390\/genes13101899","type":"journal-article","created":{"date-parts":[[2022,10,19]],"date-time":"2022-10-19T20:32:23Z","timestamp":1666211543000},"page":"1899","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["A Single Nucleotide Polymorphism Translates into a Radical Amino Acid Substitution at the Ligand-Binding Site in Fasciola hepatica Carboxylesterase B"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0464-3666","authenticated-orcid":false,"given":"Estefan","family":"Miranda-Miranda","sequence":"first","affiliation":[{"name":"Departamento de Artropodolog\u00eda, Centro Nacional de Investigaciones Disciplinarias en Salud Animal e Inocuidad, Instituto Nacional de Investigaciones Forestales Agr\u00edcolas y Pecuarias (INIFAP), Boulevard Cuauhnahuac No. 8534, Jiutepec 62574, Morelos, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Silvana","family":"Scarcella","sequence":"additional","affiliation":[{"name":"Laboratorio de Biolog\u00eda Celular y Molecular, Centro de Investigaci\u00f3n Veterinaria de Tandil (CIVETAN), CONICET, UNCPBA, Tandil 7000, Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7972-2230","authenticated-orcid":false,"given":"Enrique","family":"Reynaud","sequence":"additional","affiliation":[{"name":"Departamento de Gen\u00e9tica del Desarrollo y Fisiolog\u00eda Molecular, Instituto de Biotecnolog\u00eda, Campus Cuernavaca, Universidad Nacional Aut\u00f3noma de M\u00e9xico, Avenida Universidad, 2001, Apartado Postal 510\u20133, Cuernavaca 62210, Morelos, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3484-1612","authenticated-orcid":false,"given":"Ver\u00f3nica","family":"Narv\u00e1ez-Padilla","sequence":"additional","affiliation":[{"name":"Centro de Investigaci\u00f3n en Din\u00e1mica Celular de la Universidad Aut\u00f3noma del Estado de Morelos, Campus Cuernavaca Morelos M\u00e9xico, Av. Universidad 1001, Chamilpa, Cuernavaca 62210, Morelos, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gisela","family":"Neira","sequence":"additional","affiliation":[{"name":"Centro de Investigaci\u00f3n en Parasitolog\u00eda Regional (CIPAR), Universidad J.A. Maza, Guaymallen 5519, Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Roberto","family":"Mera-y-Sierra","sequence":"additional","affiliation":[{"name":"Centro de Investigaci\u00f3n en Parasitolog\u00eda Regional (CIPAR), Universidad J.A. 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