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Related Experiment Videos

Structurally complex and highly active RNA ligases derived from random RNA sequences

E H Ekland1, J W Szostak, D P Bartel

  • 1Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA.

Science (New York, N.Y.)
|July 21, 1995
PubMed
Summary
This summary is machine-generated.

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Researchers engineered RNA ligase ribozymes into true enzymes. Optimized versions show catalytic rates approaching protein enzymes, suggesting diverse RNA structures with similar activity exist.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • RNA Catalysis

Background:

  • Seven families of RNA ligases were previously isolated from random RNA sequences.
  • These ligases were classified into three distinct groups based on secondary structure and ligation regiospecificity.

Purpose of the Study:

  • To engineer RNA ligase ribozymes into efficient, multiple-turnover enzymes.
  • To characterize the catalytic efficiency of engineered ribozymes and compare them to natural RNA and protein enzymes.

Main Methods:

  • Engineering of two classes of ribozymes for enhanced catalytic activity.
  • Characterization of the minimal catalytic domain size and kinetic parameters (kcat) of optimized ribozymes.

Main Results:

Keywords:
NASA Discipline ExobiologyNon-NASA Center

Related Experiment Videos

  • Two classes of ribozymes were successfully engineered into true enzymes capable of multiple-turnover catalysis.
  • The most complex engineered ribozyme possesses a minimal catalytic domain of 93 nucleotides.
  • An optimized ribozyme achieved a catalytic rate (kcat) exceeding one second, comparable to protein enzymes.

    • Conclusions:

    • Engineered RNA ligases demonstrate high catalytic efficiency, rivaling protein enzymes.
    • The emergence of complex, active ribozymes from limited sequence sampling suggests a vast potential for undiscovered RNA structures with significant catalytic capabilities.