66 research outputs found
Fabrication and in vitro characterization of polymeric nanoparticles for Parkinson's therapy: a novel approach
Recombinant Human Bone Morphogenetic Protein 6 Enhances Oocyte Reprogramming Potential and Subsequent Development of the Cloned Yak Embryos
Chromosomal Localization of Human GRIM-19, a Novel IFN-β and Retinoic Acid-Activated Regulator of Cell Death
Inhibition of Apoptosis and Efficacy of Pan Caspase Inhibitor, Q-VD-OPh, in Models of Human Disease
Uncleaved TFIIA is a substrate for taspase 1 and active in transcription
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34788.pdf (publisher's version ) (Closed access)In higher eukaryotes, the large subunit of the general transcription factor TFIIA is encoded by the single TFIIAalphabeta gene and posttranslationally cleaved into alpha and beta subunits. The molecular mechanisms and biological significance of this proteolytic process have remained obscure. Here, we show that TFIIA is a substrate of taspase 1 as reported for the trithorax group mixed-lineage leukemia protein. We demonstrate that recombinant taspase 1 cleaves TFIIA in vitro. Transfected taspase 1 enhances cleavage of TFIIA, and RNA interference knockdown of endogenous taspase 1 diminishes cleavage of TFIIA in vivo. In taspase 1-/- MEF cells, only uncleaved TFIIA is detected. In Xenopus laevis embryos, knockdown of TFIIA results in phenotype and expression defects. Both defects can be rescued by expression of an uncleavable TFIIA mutant. Our study shows that uncleaved TFIIA is transcriptionally active and that cleavage of TFIIA does not serve to render TFIIA competent for transcription. We propose that cleavage fine tunes the transcription regulation of a subset of genes during differentiation and development
Analysis of rearranged immunoglobulin genes indicating a process of clonal evolution in chronic lymphocytic leukaemia
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