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The 68 kDa subunit of mammalian cleavage factor I interacts with the U7 small nuclear ribonucleoprotein and participates in 3'-end processing of animal histone mRNAs.
- Source :
-
Nucleic acids research [Nucleic Acids Res] 2010 Nov; Vol. 38 (21), pp. 7637-50. Date of Electronic Publication: 2010 Jul 15. - Publication Year :
- 2010
-
Abstract
- Metazoan replication-dependent histone pre-mRNAs undergo a unique 3'-cleavage reaction which does not result in mRNA polyadenylation. Although the cleavage site is defined by histone-specific factors (hairpin binding protein, a 100-kDa zinc-finger protein and the U7 snRNP), a large complex consisting of cleavage/polyadenylation specificity factor, two subunits of cleavage stimulation factor and symplekin acts as the effector of RNA cleavage. Here, we report that yet another protein involved in cleavage/polyadenylation, mammalian cleavage factor I 68-kDa subunit (CF I(m)68), participates in histone RNA 3'-end processing. CF I(m)68 was found in a highly purified U7 snRNP preparation. Its interaction with the U7 snRNP depends on the N-terminus of the U7 snRNP protein Lsm11, known to be important for histone RNA processing. In vivo, both depletion and overexpression of CF I(m)68 cause significant decreases in processing efficiency. In vitro 3'-end processing is slightly stimulated by the addition of low amounts of CF I(m)68, but inhibited by high amounts or by anti-CF I(m)68 antibody. Finally, immunoprecipitation of CF I(m)68 results in a strong enrichment of histone pre-mRNAs. In contrast, the small CF I(m) subunit, CF I(m)25, does not appear to be involved in histone RNA processing.
- Subjects :
- Animals
Binding Sites
Cell Line
Histones metabolism
Humans
Mice
Mutation
Protein Subunits chemistry
Protein Subunits metabolism
RNA Precursors metabolism
RNA, Messenger metabolism
RNA-Binding Proteins
Ribonucleoproteins, Small Nuclear chemistry
Ribonucleoproteins, Small Nuclear genetics
mRNA Cleavage and Polyadenylation Factors chemistry
Histones genetics
RNA 3' End Processing
Ribonucleoprotein, U7 Small Nuclear metabolism
Ribonucleoproteins, Small Nuclear metabolism
mRNA Cleavage and Polyadenylation Factors metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1362-4962
- Volume :
- 38
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- Nucleic acids research
- Publication Type :
- Academic Journal
- Accession number :
- 20634199
- Full Text :
- https://doi.org/10.1093/nar/gkq613