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Related Experiment Videos

Recognition and catalysis in nucleic acid chemistry

R Breslow1, R Xu

  • 1Department of Chemistry, Columbia University, New York, NY 10027.

Proceedings of the National Academy of Sciences of the United States of America
|February 15, 1993
PubMed
Summary

Imidazole buffers can cleave RNA, mimicking ribonuclease A (RNase A) catalysis. Studies reveal a sequential mechanism in models, contrasting with the enzyme

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Ribonuclease A (RNase A) is an enzyme crucial for RNA cleavage.
  • Its catalytic activity relies on the imidazole groups of histidine-12 and histidine-119.
  • Imidazole buffers themselves can catalyze RNA cleavage, offering a model system.

Purpose of the Study:

  • To investigate the catalytic mechanism of imidazole-mediated RNA cleavage.
  • To compare the mechanism of model systems with that of enzymatic catalysis by RNase A.
  • To explore the implications of RNA nucleotide isomerism (2',5'' vs. 3',5'') on genetic material properties.

Main Methods:

  • Conducting model studies using imidazole buffers to cleave RNA.
  • Analyzing pH-rate profiles to understand catalytic roles of imidazole groups.
  • Investigating the properties of DNA with 2',5'' phosphodiester linkages.

Main Results:

  • Imidazole buffers exhibit a bell-shaped pH vs. rate profile, similar to RNase A.
  • Model systems demonstrate sequential bifunctional catalysis, unlike the enzyme's simultaneous action.
  • Rearrangement to 2',5'' RNA isomers was observed, prompting investigation into 2',5'' DNA.

Conclusions:

  • A novel mechanism for enzymatic RNA cleavage is proposed based on model studies.
  • An improved enzyme mimic was designed based on the proposed mechanism.
  • DNA with 2',5'' linkages is less suitable for genetic information storage due to poor base stacking.

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