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Related Experiment Videos

Co-optimization of ribozyme substrate stacking and L-arginine binding.

M Yarus1, I Majerfeld

  • 1Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder 80309-0347.

Journal of Molecular Biology
|June 20, 1992
PubMed
Summary

Nucleotide 262 (nt262) in Tetrahymena RNA influences catalytic activity by stacking on nucleoside substrates. Increased nt262 frequency enhances RNA reactivity and arginine binding, suggesting a shared catalytic mechanism.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • RNA Catalysis

Background:

  • A model proposed nucleotide 262 (nt262) caps an RNA pocket for nucleoside substrates and arginine inhibitors.
  • The Tetrahymena catalytic site's structure and function are key to understanding RNA-based catalysis.

Purpose of the Study:

  • To investigate the role of nt262 in Tetrahymena RNA catalysis.
  • To determine if nt262 stacking influences substrate and inhibitor interactions.
  • To explore the relationship between nt262 frequency and catalytic efficiency.

Main Methods:

  • Utilized substituted RNAs to test the stacking model of nt262.
  • Correlated nt262 frequency in natural sequences with Tetrahymena RNA reactivity.
  • Assessed binding affinities for arginine analogs and nucleoside substrates.

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Main Results:

  • Substituted RNAs confirmed nt262 stacking on nucleoside substrates.
  • Higher nt262 frequency correlated with increased RNA reactivity for various nucleosides.
  • Increased nt262 also enhanced arginine binding and stereoselectivity, favoring L-arginine.

Conclusions:

  • The findings support the model of nt262 stacking, influencing both substrate and arginine analog interactions.
  • The arginine guanidino group likely stacks under the nt262 base.
  • Optimizing Tetrahymena catalysis for nucleosides may concurrently improve arginine binding.