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Related Experiment Videos

An additional long-range interaction in human U1 snRNA.

C Sturchler1, P Carbon, A Krol

  • 1Institut de Biologie Moléculaire et Cellulaire du CNRS, Strasbourg, France.

Nucleic Acids Research
|March 25, 1992
PubMed
Summary
This summary is machine-generated.

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Researchers found a new interaction in U1 small nuclear RNAs (snRNAs) using RNase V1. This unexpected double-stranded region suggests a conformational change is needed for U1 snRNA to function in splicing.

Area of Science:

  • Molecular Biology
  • RNA Biology
  • Gene Regulation

Background:

  • U1 small nuclear RNA (snRNA) is crucial for pre-mRNA splicing in vertebrates.
  • The 5' end of U1 snRNA is known to base-pair with the pre-mRNA 5' splice site.
  • This interaction was previously thought to involve a single-stranded 5' region of U1 snRNA.

Purpose of the Study:

  • To investigate potential long-range interactions within vertebrate U1 snRNAs.
  • To characterize the structural properties of the U1 snRNA 5' terminal region.
  • To understand the conformational dynamics of U1 snRNA during splicing.

Main Methods:

  • Enzymatic cleavage assays using RNase V1, a nuclease specific for double-stranded RNA regions.
  • Analysis of human U1 small nuclear ribonucleoprotein (snRNP) and in vitro transcribed U1 snRNAs.

Related Experiment Videos

  • Site-directed mutagenesis to disrupt or restore potential base-pairing interactions.

    • Main Results:

    • RNase V1 cleavage was detected in the 5' terminal region (positions 5-9) of U1 snRNA, indicating a double-stranded structure.
    • This RNase V1-sensitive region was resistant to single-stranded probes, contradicting previous assumptions.
    • A complementary sequence (GGUAG, positions 132-136) was identified as the likely base-pairing partner, forming an additional helix.

    Conclusions:

    • Vertebrate U1 snRNAs possess an additional long-range helical interaction in their 5' terminal region.
    • This interaction involves base-pairing between positions 5-9 and 132-136 of U1 snRNA.
    • The presence of this helix, even under in vitro splicing conditions, implies a necessary conformational change to free the U1 snRNA 5' end for splice site recognition.