Detection and localization of small nuclear ribonucleoproteins (snRNPs) in trypanosomatids using anti-m(3)G antibodies

• Autor(a) principal: Bosetto, Maira Cegatti [UNESP]
• Data de Publicação: 2008
• Outros Autores: Mortara, Renato Arruda, Ambrosio, Daniela Luz [UNESP], Passerini, Gabriela Duo [UNESP], Alves da Silva, Marco Tulio [UNESP], Okuda, Erica Sayuri [UNESP], Cicarelli, Regina Maria Barretto [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www0.nih.go.jp/JJID/61/95.html; http://hdl.handle.net/11449/41736

This work reports for the first time the identification and immunolocalization, by confocal and conventional indirect immunofluorescence, of m(3)G epitopes present in ribonucleoproteins of the following trypanosomatids: Trypanosoma cruzi epimastigotes of three different strains, Blastocrithidia ssp., and Leishmania major promastigotes. The identity of these epitopes and hence the specificity of the anti-m(3)G monoclonal antibody were ascertained through competition reaction with 7-methylguanosine that blocks the Ig binding sites, abolishing the fluorescence in all the parasites tested and showing a specific perinuclear localization of the snRNPs, which suggests their nuclear reimport in the parasites. Using an immunoprecipitation technique, it was also possible to confirm the presence of the trimethylguanosine epitopes in trypanosomatids.