Ismael Pérez

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Alternative splicing of pre-mRNA is a commonly used mechanism to regulate gene expression in higher eukaryotes. However, with the exception of regulated cascades in Drosophila, the cis-acting elements and the trans-acting factors that control tissue- and/or developmentally regulated splicing remain largely unidentified. Cis-acting elements that control(More)
PTB-associated splicing factor (PSF) has been implicated in both early and late steps of pre-mRNA splicing, but its exact role in this process remains unclear. Here we show that PSF interacts with p54nrb, a highly related protein first identified based on cross-reactivity to antibodies against the yeast second-step splicing factor Prpl8. We performed(More)
Polypyrimidine tract binding protein (PTB) is a 57 kD hnRNP protein (hnRNP I) that binds to the pyrimidine tract typically found near the 3' end of introns. Primary sequence analysis suggests that PTB contains four RNA recognition motifs (RRMs). Data from comparative structural and deletional analysis of PTB are consistent with the presence of a four(More)
Polycistronic pre-mRNAs from Caenorhabditis elegans are processed by 3' end formation of the upstream mRNA and SL2-specific trans-splicing of the downstream mRNA. These processes usually occur within an approximately 100-nucleotide region and are mechanistically coupled. In this paper, we report a complex in C. elegans extracts containing the 3' end(More)
Several initiatives for establishing standards for metadata models are being carried out at the moment, but everyone focuses on their own requirements when defining metadata attributes, their possible values and the relation between them. From the point of view of someone who wants to seek and buy information (multimedia content in general) in different(More)
The present paper reports the approaches to design a punch press security system and the results of the first phase of design. The process of design of the system is based on the philosophy mechatronics design, with the aim of providing a safe product, reliable, high-quality and effective to increase the competitiveness of the company.
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