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Mutational isolation of a sieve for editing in a transfer RNA synthetase

Academic Article
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Overview

authors

  • Schmidt, E.
  • Schimmel, Paul

publication date

  • April 1994

journal

  • Science  Journal

abstract

  • Editing reactions are essential for the high fidelity of information transfer in processes such as replication, RNA splicing, and protein synthesis. The accuracy of interpretation of the genetic code is enhanced by the editing reactions of aminoacyl transfer RNA (tRNA) synthetases, whereby amino acids are prevented from being attached to the wrong tRNAs. Amino acid discrimination is achieved through sieves that may overlap with or coincide with the amino acid binding site. With the class I Escherichia coli isoleucine tRNA synthetase, which activates isoleucine and occasionally misactivates valine, as an example, a rationally chosen mutant enzyme was constructed that lacks entirely its normal strong ability to distinguish valine from isoleucine by the initial amino acid recognition sieve. The misactivated valine, however, is still eliminated by hydrolytic editing reactions. These data suggest that there is a distinct sieve for editing that is functionally independent of the amino acid binding site.

subject areas

  • Adenosine Triphosphate
  • Binding Sites
  • Escherichia coli
  • Isoleucine
  • Isoleucine-tRNA Ligase
  • Kinetics
  • Mutation
  • Protein Structure, Secondary
  • RNA Editing
  • RNA, Transfer, Ile
  • Valine
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Identity

International Standard Serial Number (ISSN)

  • 0036-8075

Digital Object Identifier (DOI)

  • 10.1126/science.8146659

PubMed ID

  • 8146659
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Additional Document Info

start page

  • 265

end page

  • 267

volume

  • 264

issue

  • 5156

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