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Related Experiment Videos

The solution structure of an RNA loop-loop complex: the ColE1 inverted loop sequence

A J Lee1, D M Crothers

  • 1Department of Chemistry, Yale University, New Haven, CT 06520-8107, USA.

Structure (London, England : 1993)
|September 18, 1998
PubMed
Summary

The RNA one modulator (ROM) protein recognizes specific RNA structures, not sequences, to regulate ColE1 plasmid replication. This study reveals the loop-loop complex structure, showing unique distortions for ROM protein binding.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • ColE1 plasmid replication in Escherichia coli is regulated by interactions between antisense RNA I and RNA II.
  • Antisense RNA I inhibits replication by forming a duplex with RNA II, a process stabilized by the RNA one modulator (ROM) protein.
  • The ROM protein is believed to recognize a specific RNA structure, independent of its nucleotide sequence.

Purpose of the Study:

  • To determine the solution structure of a loop-loop complex formed between model RNA hairpins mimicking RNA I and RNA II.
  • To elucidate the structural basis for the non-sequence-specific recognition of RNA structures by the ROM protein.

Main Methods:

  • Nuclear magnetic resonance (NMR) spectroscopy was employed to determine the three-dimensional structure of the RNA loop-loop complex.

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  • Model RNA hairpins with inverted loop sequences were designed for enhanced complex stability.

    • Main Results:

    • The determined structure revealed continuous stacking interactions from stem helices through the loop-loop helix.
    • Unique structural features, including bridging phosphodiester bonds forming 'phosphate clusters' and cross-strand stacking interactions, were identified.
    • A significant bend in the RNA structure was observed within the loop-loop helix.

    Conclusions:

    • The identified structural distortions, such as the bend and phosphate clusters, present a non-sequence-specific binding site for the ROM protein.
    • The elucidated structure provides insights into the sequence-dependent stability of RNA loop-loop interactions and ROM protein binding.