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Leaky Scanning02:28

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
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Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
11:34

Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins

Published on: August 9, 2019

Human U2B″ protein binding to snRNA stemloops.

Sandra G Williams1, Kathleen B Hall

  • 1Department of Biochemistry and Molecular Biophysics, Washington University Medical School, St Louis, MO 63110, United States.

Biophysical Chemistry
|June 21, 2011
PubMed
Summary
This summary is machine-generated.

The human U2B″ protein, a component of U2 snRNP, exhibits relaxed RNA binding specificity. It binds to multiple RNA stem-loops, unlike related proteins, offering insights into target preference evolution.

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Last Updated: May 31, 2026

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Area of Science:

  • Molecular Biology
  • RNA-protein interactions
  • Structural Biology

Background:

  • The U2B″ protein is a key component of the U2 small nuclear ribonucleoprotein (snRNP).
  • It belongs to the U1A/U2B″ protein family and interacts with Stem-Loop IV (SLIV) of U2 snRNA within the U2 snRNP.

Purpose of the Study:

  • To investigate the RNA binding specificity of the human U2B″ protein.
  • To compare the binding properties of U2B″ with related proteins like human U1A and Drosophila SNF.
  • To understand the evolutionary modulation of target preferences within the U1A/U2B″ protein family.

Main Methods:

  • In vitro binding assays were performed to assess the interaction of human U2B″ with various RNA stem-loops.
  • Thermodynamic analysis was used to quantify the binding affinities and characteristics.

Main Results:

  • Human U2B″ binds to human U2 snRNA SLIV, human U1 snRNA SLII, and Drosophila U2 snRNA SLIV.
  • The thermodynamics of these interactions are remarkably similar, indicating relaxed RNA target specificity for U2B″.
  • U2B″ displays distinct binding properties compared to human U1A and Drosophila SNF, despite high homology.

Conclusions:

  • The human U2B″ protein possesses a relaxed specificity for its RNA targets.
  • These findings provide novel insights into how protein families diversify and modulate their RNA binding preferences during evolution.