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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

New insights into trypanosomatid U5 small nuclear ribonucleoproteins

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Autor(es):
da Silva, Marco Tulio A. [1, 2] ; Ambrosio, Daniela L. [2] ; Trevelin, Caroline C. [2] ; Watanabe, Tatiana F. [2] ; Laure, Helen J. [3, 4] ; Greene, Lewis J. [3, 4] ; Rosa, Jose C. [3, 4] ; Valentini, Sandro R. [2] ; Cicarelli, Regina M. B. [2]
Número total de Autores: 9
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista, Inst Quim, Araraquara, SP - Brazil
[2] Univ Estadual Paulista, Fac Ciencias Farmaceut, Dept Ciencias Biol, Araraquara, SP - Brazil
[3] Univ Sao Paulo, Fac Med Ribeirao Preto, Ctr Quim Prot, Ribeirao Preto, SP - Brazil
[4] Univ Sao Paulo, Fac Med Ribeirao Preto, Ctr Reg Hemoterapia, Ribeirao Preto, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Memórias do Instituto Oswaldo Cruz; v. 106, n. 2, p. 130-138, MAR 2011.
Citações Web of Science: 4
Resumo

Several protozoan parasites exist in the Trypanosomatidae family, including various agents of human diseases. Multiple lines of evidence suggest that important differences are present between the translational and mRNA processing (trans splicing) systems of trypanosomatids and other eukaryotes. In this context, certain small complexes of RNA and protein, which are named small nuclear ribonucleoproteins (U snRNPs), have an essential role in pre-mRNA processing, mainly during splicing. Even though they are well defined in mammals, snRNPs are still not well characterized in trypanosomatids. This study shows that a U5-15K protein is highly conserved among various trypanosomatid species. Tandem affinity pull-down assays revealed that this protein interacts with a novel U5-102K protein, which suggests the presence of a sub-complex that is potentially involved in the assembly of U4/U6-U5 tri-snRNPs. Functional analyses showed that U5-15K is essential for cell viability and is somehow involved with the trans and cis splicing machinery. Similar tandem affinity experiments with a trypanonosomatid U5-Cwc21 protein led to the purification of four U5 snRNP specific proteins and a Sm core, suggesting U5-Cwc-21 participation in the 35S U5 snRNP particle. Of these proteins, U5-200K was molecularly characterized. U5-200K has conserved domains, such as the DEAD/DEAH box helicase and Sec63 domains and displays a strong interaction with U5 snRNA. (AU)

Processo FAPESP: 07/07476-0 - Caracterização molecular e funcional de proteínas que compõem o complexo spliceosomal em tripanosomatídeos
Beneficiário:Regina Maria Barretto Cicarelli
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 06/05766-8 - Identificação e caracterização funcional de proteínas específicas do complexo U5 snRNP de Trypanosoma cruzi
Beneficiário:Regina Maria Barretto Cicarelli
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 08/56226-9 - Caracterização molecular e funcional de proteínas que compõem o complexo spliceosomal em tripanosomatídeos
Beneficiário:Daniela Luz Ambrósio Breisch
Linha de fomento: Bolsas no Brasil - Pós-Doutorado