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Small structural costs for evolution from RNA to RNP-based catalysis.

Ivelitza Garcia1, Kevin M Weeks

  • 1Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599-3290, USA.

Journal of Molecular Biology
|July 24, 2003
PubMed
Summary
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Protein cofactors minimally increase structural costs for RNA catalysts, suggesting RNA-protein complexes (RNPs) are evolutionarily favored. This study quanties the structural "cost" of protein facilitation in RNA splicing.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • RNA catalysts (ribozymes) often require protein cofactors for activity.
  • It remains unclear if protein binding imposes extra structural constraints on RNA beyond catalytic needs.

Purpose of the Study:

  • To quantify the structural cost associated with protein facilitation of RNA splicing.
  • To investigate the extent to which RNA must maintain structures for protein binding beyond those essential for catalysis.

Main Methods:

  • Utilized nucleotide analog interference mapping to identify critical functional groups in a group I intron.
  • Assessed the impact of specific substitutions on both RNA self-splicing and protein-facilitated splicing (by CBP2).

Main Results:

Related Experiment Videos

  • Identified 71 functional group substitutions affecting bI5 group I intron self-splicing.
  • Protein CBP2 suppressed a significant fraction of substitutions, particularly at adenosine bases.
  • Quantified a minimal structural cost of only four functional groups for protein facilitation, suggesting it's not primarily for direct protein contact.

Conclusions:

  • Protein facilitation of RNA splicing incurs a surprisingly small structural cost.
  • This low cost provides a rationale for the evolution of RNA-protein complexes (RNPs).
  • The identified costs likely relate to preventing misfolding rather than maintaining protein-binding sites.