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Type: Artigo
Title: Functional association of human Ki‐1/57 with pre‐mRNA splicing events
Author: Bressan, Gustavo C.
Quaresma, Alexandre J. C.
Moraes, Eduardo C.
Manfiolli, Adriana O.
Passos, Dario O.
Gomes, Marcelo D.
Kobarg, Joerg
Abstract: The cytoplasmic and nuclear protein Ki- 1 / 57 was first identified in malignant cells from Hodgkin's lymphoma. Despite studies showing its phosphorylation, arginine methylation, and interaction with several regulatory proteins, the functional role of Ki- 1 / 57 in human cells remains to be determined. Here, we investigated the relationship of Ki- 1 / 57 with RNA functions. Through immunoprecipitation assays, we verified the association of Ki- 1 / 57 with the endogenous splicing proteins hnRNPQ and SFRS9 in HeLa cell extracts. We also found that recombinant Ki- 1 / 57 was able to bind to a poly- U RNA probe in electrophoretic mobility shift assays. In a classic splicing test, we showed that Ki- 1 / 57 can modify the splicing site selection of the adenoviral E1A minigene in a dose- dependent manner. Further confocal and. uorescence microscopy analysis revealed the localization of enhanced green. uorescent protein - Ki- 1 / 57 to nuclear bodies involved in RNA processing and or small nuclear ribonucleoprotein assembly, depending on the cellular methylation status and its N- terminal region. In summary, our findings suggest that Ki- 1 / 57 is probably involved in cellular events related to RNA functions, such as pre- mRNA splicing
Subject: Interação proteína-proteína
Country: Reino Unido
Editor: Wiley
Rights: Fechado
Identifier DOI: 10.1111/j.1742-4658.2009.07092.x
Date Issue: 2009
Appears in Collections:IB - Artigos e Outros Documentos

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