{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,24]],"date-time":"2026-01-24T14:38:44Z","timestamp":1769265524563,"version":"3.49.0"},"reference-count":52,"publisher":"Portland Press Ltd.","issue":"3","content-domain":{"domain":["portlandpress.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2008,11,1]]},"abstract":"<jats:p>Proteins of the SIR2 (Silent Information Regulator 2) family are characterized by a conserved catalytic domain that exerts unique NAD+-dependent deacetylase activity on histones and various other cellular substrates. Previous reports from us have identified a Leishmania infantum gene encoding a cytosolic protein termed LiSIR2RP1 (Leishmania infantum SIR2-related protein 1) that belongs to the SIR2 family. Targeted disruption of one LiSIR2RP1 gene allele led to decreased amastigote virulence, in vitro as well as in vivo. In the present study, attempts were made for the first time to explore and characterize the enzymatic functions of LiSIR2RP1. The LiSIR2RP1 exhibited robust NAD+-dependent deacetylase and ADP-ribosyltransferase activities. Moreover, LiSIR2RP1 is capable of deacetylating tubulin, either in dimers or, when present, in taxol-stabilized microtubules or in promastigote and amastigote extracts. Furthermore, the immunostaining of parasites revealed a partial co-localization of \u03b1-tubulin and LiSIR2RP1 with punctate labelling, seen on the periphery of both promastigote and amastigote stages. Isolated parasite cytoskeleton reacted with antibodies showed that part of LiSIR2RP1 is associated to the cytoskeleton network of both promastigote and amastigote forms. Moreover, the Western blot analysis of the soluble and insoluble fractions of the detergent of promastigote and amastigote forms revealed the presence of \u03b1-tubulin in the insoluble fraction, and the LiSIR2RP1 distributed in both soluble and insoluble fractions of promastigotes as well as amastigotes. Collectively, the results of the present study demonstrate that LiSIR2RP1 is an NAD+-dependent deacetylase that also exerts an ADP-ribosyltransferase activity. The fact that tubulin could be among the targets of LiSIR2RP1 may have significant implications during the remodelling of the morphology of the parasite and its interaction with the host cell.<\/jats:p>","DOI":"10.1042\/bj20080666","type":"journal-article","created":{"date-parts":[[2008,7,4]],"date-time":"2008-07-04T08:36:49Z","timestamp":1215160609000},"page":"377-386","update-policy":"https:\/\/doi.org\/10.1042\/crossmark_policy","source":"Crossref","is-referenced-by-count":43,"title":["The <i>Leishmania infantum<\/i> cytosolic SIR2-related protein 1 (LiSIR2RP1) is an NAD+-dependent deacetylase and ADP-ribosyltransferase"],"prefix":"10.1042","volume":"415","author":[{"given":"Joana","family":"Tavares","sequence":"first","affiliation":[{"name":"IBMC-Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal"},{"name":"Laborat\u00f3rio de Bioqu\u00edmica, Faculdade de Farm\u00e1cia da Universidade do Porto, R. An\u00edbal Cunha n\u00b0 164, 4050-047 Porto, Portugal"},{"name":"Centre IRD de Montpellier, 911 avenue Agropolis, 34394 Montpellier, France"}]},{"given":"Ali","family":"Ouaissi","sequence":"additional","affiliation":[{"name":"IBMC-Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal"},{"name":"Centre IRD de Montpellier, 911 avenue Agropolis, 34394 Montpellier, France"},{"name":"INSERM, CNRS, UMR 5235, Universit\u00e9 de Montpellier 2, B\u00e2t 24 \u2013 CC 107, Pl. Eug\u00e8ne Bataillon, 34095 Montpellier C\u00e9dex 5, France"}]},{"given":"Nuno","family":"Santar\u00e9m","sequence":"additional","affiliation":[{"name":"IBMC-Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal"},{"name":"Laborat\u00f3rio de Bioqu\u00edmica, Faculdade de Farm\u00e1cia da Universidade do Porto, R. An\u00edbal Cunha n\u00b0 164, 4050-047 Porto, Portugal"}]},{"given":"Denis","family":"Sereno","sequence":"additional","affiliation":[{"name":"INSERM, CNRS, UMR 5235, Universit\u00e9 de Montpellier 2, B\u00e2t 24 \u2013 CC 107, Pl. Eug\u00e8ne Bataillon, 34095 Montpellier C\u00e9dex 5, France"}]},{"given":"Baptiste","family":"Vergnes","sequence":"additional","affiliation":[{"name":"INSERM, CNRS, UMR 5235, Universit\u00e9 de Montpellier 2, B\u00e2t 24 \u2013 CC 107, Pl. Eug\u00e8ne Bataillon, 34095 Montpellier C\u00e9dex 5, France"}]},{"given":"Paula","family":"Sampaio","sequence":"additional","affiliation":[{"name":"IBMC-Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal"}]},{"given":"Anabela","family":"Cordeiro-Da-Silva","sequence":"additional","affiliation":[{"name":"IBMC-Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal"},{"name":"Laborat\u00f3rio de Bioqu\u00edmica, Faculdade de Farm\u00e1cia da Universidade do Porto, R. 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