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Heterogeneous nuclear ribonucleoprotein F/H proteins modulate the alternative splicing of the apoptotic mediator Bcl-x.
J Biol Chem. 2005 Jun 17; 280(24):22641-50.JB

Abstract

Bcl-x is a member of the Bcl-2 family of proteins that are key regulators of apoptosis. The Bcl-x pre-mRNA is alternatively spliced to yield Bcl-x(S) and Bcl-x(L), two isoforms that have been associated, respectively, with the promotion and the prevention of apoptosis. We have investigated some of the elements and factors involved in the production of these two splice variants. Deletion mutagenesis using a human Bcl-x minigene identifies two regions in exon 2 that modulate Bcl-x 5'-splice site selection in human HeLa cells. One region (B3) is located upstream of the Bcl-x(L) 5'-splice site and enforces Bcl-x(L) production in cells and splicing extracts. The other region (B2) is located immediately downstream of the 5'-splice site of Bcl-x(S) and favors Bcl-x(S) production in vivo and in vitro. A 30-nucleotide G-rich element (B2G) is responsible for the activity of the B2 element. We show that recombinant heterogeneous nuclear ribonucleoprotein (hnRNP) F and H proteins bind to B2G, and mutating the G stretches abolishes binding. Moreover, the addition of hnRNP F to a HeLa extract improved the production of the Bcl-x(S) variant in a manner that was dependent on the integrity of the G stretches in B2G. Consistent with the in vitro results, small interfering RNA-mediated RNA interference targeting hnRNP F and H decreased the Bcl-x(S)/Bcl-x(L) ratio of plasmid-derived and endogenously produced Bcl-x transcripts. Our results document a positive role for the hnRNP F/H proteins in the production of the proapoptotic regulator Bcl-x(S.).

Authors+Show Affiliations

RNA/RNP Group, Département de microbiologie et d'infectiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Québec, Canada.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15837790

Citation

Garneau, Daniel, et al. "Heterogeneous Nuclear Ribonucleoprotein F/H Proteins Modulate the Alternative Splicing of the Apoptotic Mediator Bcl-x." The Journal of Biological Chemistry, vol. 280, no. 24, 2005, pp. 22641-50.
Garneau D, Revil T, Fisette JF, et al. Heterogeneous nuclear ribonucleoprotein F/H proteins modulate the alternative splicing of the apoptotic mediator Bcl-x. J Biol Chem. 2005;280(24):22641-50.
Garneau, D., Revil, T., Fisette, J. F., & Chabot, B. (2005). Heterogeneous nuclear ribonucleoprotein F/H proteins modulate the alternative splicing of the apoptotic mediator Bcl-x. The Journal of Biological Chemistry, 280(24), 22641-50.
Garneau D, et al. Heterogeneous Nuclear Ribonucleoprotein F/H Proteins Modulate the Alternative Splicing of the Apoptotic Mediator Bcl-x. J Biol Chem. 2005 Jun 17;280(24):22641-50. PubMed PMID: 15837790.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Heterogeneous nuclear ribonucleoprotein F/H proteins modulate the alternative splicing of the apoptotic mediator Bcl-x. AU - Garneau,Daniel, AU - Revil,Timothée, AU - Fisette,Jean-François, AU - Chabot,Benoit, Y1 - 2005/04/18/ PY - 2005/4/20/pubmed PY - 2005/7/20/medline PY - 2005/4/20/entrez SP - 22641 EP - 50 JF - The Journal of biological chemistry JO - J Biol Chem VL - 280 IS - 24 N2 - Bcl-x is a member of the Bcl-2 family of proteins that are key regulators of apoptosis. The Bcl-x pre-mRNA is alternatively spliced to yield Bcl-x(S) and Bcl-x(L), two isoforms that have been associated, respectively, with the promotion and the prevention of apoptosis. We have investigated some of the elements and factors involved in the production of these two splice variants. Deletion mutagenesis using a human Bcl-x minigene identifies two regions in exon 2 that modulate Bcl-x 5'-splice site selection in human HeLa cells. One region (B3) is located upstream of the Bcl-x(L) 5'-splice site and enforces Bcl-x(L) production in cells and splicing extracts. The other region (B2) is located immediately downstream of the 5'-splice site of Bcl-x(S) and favors Bcl-x(S) production in vivo and in vitro. A 30-nucleotide G-rich element (B2G) is responsible for the activity of the B2 element. We show that recombinant heterogeneous nuclear ribonucleoprotein (hnRNP) F and H proteins bind to B2G, and mutating the G stretches abolishes binding. Moreover, the addition of hnRNP F to a HeLa extract improved the production of the Bcl-x(S) variant in a manner that was dependent on the integrity of the G stretches in B2G. Consistent with the in vitro results, small interfering RNA-mediated RNA interference targeting hnRNP F and H decreased the Bcl-x(S)/Bcl-x(L) ratio of plasmid-derived and endogenously produced Bcl-x transcripts. Our results document a positive role for the hnRNP F/H proteins in the production of the proapoptotic regulator Bcl-x(S.). SN - 0021-9258 UR - https://www.unboundmedicine.com/medline/citation/15837790/Heterogeneous_nuclear_ribonucleoprotein_F/H_proteins_modulate_the_alternative_splicing_of_the_apoptotic_mediator_Bcl_x_ DB - PRIME DP - Unbound Medicine ER -