The 25 kDa Subunit of Cleavage Factor Im Is a RNA-Binding Protein That Interacts with the PolyA Polymerase in Entamoeba histolyticaReportar como inadecuado




The 25 kDa Subunit of Cleavage Factor Im Is a RNA-Binding Protein That Interacts with the PolyA Polymerase in Entamoeba histolytica - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

In eukaryotes, polyadenylation of pre-mRNA 3 end is essential for mRNA export, stability and translation. Taking advantage of the knowledge of genomic sequences of Entamoeba histolytica, the protozoan responsible for human amoebiasis, we previously reported the putative polyadenylation machinery of this parasite. Here, we focused on the predicted protein that has the molecular features of the 25 kDa subunit of the Cleavage Factor Im CFIm25 from other organisms, including the Nudix nucleoside diphosphate linked to another moiety X domain, as well as the RNA binding domain and the PAP-PAB interacting region. The recombinant EhCFIm25 protein rEhCFIm25 was expressed in bacteria and used to generate specific antibodies in rabbit. Subcellular localization assays showed the presence of the endogenous protein in nuclear and cytoplasmic fractions. In RNA electrophoretic mobility shift assays, rEhCFIm25 was able to form specific RNA-protein complexes with the EhPgp5 mRNA 3 UTR used as probe. In addition, Pull-Down and LC-ESI-MS-MS tandem mass spectrometry assays evidenced that the putative EhCFIm25 was able to interact with the polyA polymerase EhPAP that is responsible for the synthesis of the polyA tail in other eukaryotic cells. By Far-Western experiments, we confirmed the interaction between the putative EhCFIm25 and EhPAP in E. histolytica. Taken altogether, our results showed that the putative EhCFIm25 is a conserved RNA binding protein that interacts with the polyA polymerase, another member of the pre-mRNA 3 end processing machinery in this protozoan parasite.



Autor: Marisol Pezet-Valdez, Jorge Fernández-Retana, Juan David Ospina-Villa, María Esther Ramírez-Moreno, Esther Orozco, Socorro Cha

Fuente: http://plos.srce.hr/



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