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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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RNA Polymerase Ribozyme That Recognizes the Template-Primer Complex through Tertiary Interactions.

Ankana Kakoti1, Gerald F Joyce1

  • 1The Salk Institute, 10010 North Torrey Pines Road, La Jolla, California 92037, United States.

Biochemistry
|May 31, 2023
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Summary
This summary is machine-generated.

This study engineered an RNA polymerase ribozyme for efficient RNA synthesis. It utilizes tertiary interactions for sequence-general recognition of RNA templates and primers, enabling unconstrained genetic information transfer.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Origin of Life Studies

Background:

  • RNA enzymes (ribozymes) typically require specific base-pairing for substrate engagement, limiting their sequence generality.
  • Directed evolution has been used to optimize ribozymes for improved efficiency and broader substrate recognition.

Purpose of the Study:

  • To characterize an RNA polymerase ribozyme optimized for sequence-general RNA synthesis through tertiary interactions.
  • To understand the kinetic properties and structural basis for the enhanced function of this ribozyme.

Main Methods:

  • Directed evolution of an RNA polymerase ribozyme.
  • Kinetic analysis using Michaelis-Menten kinetics.
  • UV cross-linking studies to map active site interactions.

Main Results:

  • The optimized ribozyme recognizes RNA templates, primers, and nucleoside triphosphates (NTPs) via tertiary interactions, independent of template sequence.
  • The ribozyme exhibits Michaelis-Menten saturation kinetics with a catalytic rate of 0.1–1 min-1 and a Km of 0.1–1 μM.
  • Structural rearrangements in the catalytic center, driven by directed evolution, enabled saturable substrate binding.

Conclusions:

  • The engineered RNA polymerase ribozyme demonstrates sequence-general RNA polymerization through tertiary interactions, mimicking protein polymerases.
  • This advancement is crucial for understanding the unconstrained transmission of genetic information and has implications for the origin of life.