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1

Characterization of proteins associating with 5' terminus of PGHS-1 mRNA

100%
Bunimov N., Laneuville O.
Cellular and Molecular Biology Letters
|
2010
|
tom 15
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nr 2
Induction of Prostaglandin Endoperoxide H Synthase-1 (PGHS-1) gene has been previously documented in a few studies during events such as development and cellular differentiation. However, molecular mechanisms governing the regulation of PGHS-1 gene expression and contributing to changes in protein levels are poorly understood. Using the MEG-01 cell model of PGHS-1 gene induction, our laboratory has previously demonstrated that the 5’UTR and the first two exons of PGHS-1 mRNA had a significant impact on decreasing the translational efficiency of a reporter gene and suggested that the presence of a secondary structure is required for conservation of this activity. This 5’end of PGHS-1 mRNA sequence has also been shown to associate with nucleolin protein. In the current study, we set to investigate the protein composition of the mRNP (messenger ribonucleoprotein) associating with the 5’end of PGHS-1 mRNA and to identify its protein members. RNA/protein binding assays coupled with LC-MS analysis identified serpin B1 and NF45 (nuclear factor 45) proteins as potential members of PGHS-1 mRNP complex. Immunoprecipitation experiments using MEG-01 protein extracts validated mass spectrometry data and confirmed binding of nucleolin, serpin B1, NF45 and NF90. The RNA fraction was extracted from immunoprecipitated mRNP complexes and association of RNA binding proteins, serpin B1, NF45 and NF90, to PGHS-1 mRNA target sequence was confirmed by RT-PCR. Together these data suggest that serpin B1, NF45 and NF90 associate with PGHS-1 mRNA and can potentially participate in the formation a single or a number of PGHS-1 ribonucleoprotein complexes, through nucleolin that possibly serves as a docking base for other protein complex members.
2

The role of nuclear and cytoplasmic factors in the regulation of the interautogamous interval [IAI] in the Paramecium aurelia species complex

100%
Prajer M., Kosciuszko H.
Folia Biologica
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1998
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tom 46
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nr 1-2
3

The mitochondrial localization of RelB and NFATx in immature T cells

84%
Stasik I., Rapak A., Ziolo E., Strzadala L.
Cellular and Molecular Biology Letters
|
2008
|
tom 13
|
nr 4
493-501
In order to exert their activity, transcription factors must be transported to the nucleus. Certain transcription factors have also been found on mitochondria. Here, the localization of RelB and NFATx in the mitochondrial fractions of normal thymocytes and thymic lymphoma cells is shown for the first time. CREB was only found in the nucleus, while p50 (NFκB) was found in both the nucleus and the cytoplasm, but outside the mitochondria. The translocation of transcription factors to the mitochondria is differentially regulated. Unlike RelB, which is always present in the mitochondrial fraction, NFATx appeared on the mitochondria in cells treated with ionomycin together with an immunosuppressant and inhibitor of calcineurin (FK506). This data reveals that the mitochondrial localization of some transcription factors is precisely controlled by a calcium signal sensitive to FK506 in T cells.
4
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Comparison of acetaminophen toxicity in primary hepatocytes isolated from transgenic mice with different apolipoprotein E alleles

67%
Mezera V., Kucera O., Moravcova A., Peterova E., Rousar T., Rychtrmoc D., Sobotka O., Cervinkova Z.
Journal of Physiology and Pharmacology
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2015
|
tom 66
|
nr 6
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