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Stem-loop binding protein facilitates 3'-end formation by stabilizing U7 snRNP binding to histone pre-mRNA
Z Dominski1, L X Zheng, R Sanchez
1Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
Molecular and Cellular Biology
|April 17, 1999
Summary
Stem-loop binding protein (SLBP) is crucial for histone mRNA 3' end processing. A minimal 93-amino acid region of SLBP, including its RNA-binding domain, is essential for this cleavage reaction.
Area of Science:
- Molecular Biology
- RNA Processing
- Gene Expression Regulation
Background:
- Histone mRNA 3' end formation relies on endonucleolytic cleavage.
- This process requires stem-loop binding protein (SLBP) and U7 small nuclear ribonucleoprotein (snRNP).
Purpose of the Study:
- To identify the essential regions of human SLBP for 3' end processing of histone mRNA.
- To elucidate the role of SLBP in the interaction between U7 snRNP and histone pre-mRNA.
Main Methods:
- Deletion mutagenesis of human SLBP.
- Complementation assays using SLBP-depleted nuclear extracts.
- Coimmunoprecipitation to assess protein-RNA complex formation.
Main Results:
- The N-terminal and most of the C-terminal domains of SLBP are dispensable for processing.
- A minimal 93-amino acid region, including the RNA-binding domain, is sufficient for efficient histone pre-mRNA cleavage.
- The C-terminal 20 amino acids adjacent to the RNA-binding domain are critical, as their replacement severely impairs processing.
- SLBP stabilizes the interaction of histone pre-mRNA with U7 snRNP.
Conclusions:
- The minimal functional unit of SLBP for histone mRNA 3' processing comprises 93 amino acids.
- SLBP plays a key role in facilitating the U7 snRNP-dependent cleavage by stabilizing pre-mRNA binding.