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

• Autorzy: Bunimov N , Laneuville O.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

protein; prostaglandin endoperoxide synthase; cyclooxygenase-1; megakaryoblastic cell; ribonucleoprotein; nuclear factor; mRNA

• Wydawca: -
• Czasopismo: Cellular and Molecular Biology Letters
• Rocznik: 2010
• Tom: 15
• Numer: 2
• Opis fizyczny: p.196-214,fig.,ref.

Twórcy

autor

Bunimov N

• University of Ottawa, 451 Smyth Rd., Ottawa, Ontario, K1H 8M5 Canada

autor

Laneuville O.

Bibliografia

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