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The stem-loop binding protein forms a highly stable and specific complex with the 3' stem-loop of histone mRNAs.

D J Battle1, J A Doudna

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520, USA

RNA (New York, N.Y.)
|February 24, 2001
PubMed
Summary

Stem-loop binding protein (SLBP) binds histone mRNA stem-loops with high affinity. This interaction is sequence-specific, involving conserved RNA regions and flanking sequences, crucial for regulating histone gene expression.

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Gene Regulation

Background:

  • Replication-dependent histone mRNAs feature a conserved 26-nucleotide stem-loop structure.
  • Stem-loop binding protein (SLBP) interacts with this structure in both nucleus and cytoplasm.
  • SLBP is essential for mRNA transport and 3'-end processing mediated by U7 snRNP.

Purpose of the Study:

  • To investigate the affinity and specificity of the interaction between SLBP and its cognate stem-loop RNA.
  • To identify the RNA sequence elements critical for SLBP recognition and binding.

Main Methods:

  • Nitrocellulose filter-binding assays to determine binding affinity (Kd).
  • Binding studies using a series of stem-loop RNA variants.
  • Deletion analysis to map critical RNA regions.

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Main Results:

  • SLBP binds the stem-loop RNA with a high apparent equilibrium dissociation constant (Kd) of 1.5 nM.
  • Conserved residues within the stem, loop, and flanking regions are essential for efficient SLBP binding.
  • Specific sequence contacts occur at the loop, top and base of the stem, and flanking sequences.

Conclusions:

  • SLBP recognizes its target RNA through a complex, sequence-specific mechanism involving multiple RNA elements.
  • This high-affinity interaction is central to the formation of a ribonucleoprotein complex.
  • The findings elucidate a novel mode of protein-RNA recognition critical for histone gene expression regulation.