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Chemical Triphosphorylation of Oligonucleotides
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Error thresholds for self- and cross-specific enzymatic replication.

Benedikt Obermayer1, Erwin Frey

  • 1Arnold-Sommerfeld-Center for Theoretical Physics and Center for NanoScience, Ludwig-Maximilians-Universität München, Theresienstr. 37, 80333 München, Germany.

Journal of Theoretical Biology
|September 25, 2010
PubMed
Summary
This summary is machine-generated.

Enzymatic replication can enhance molecular complexity. Specificity in recognition sequences helps maintain information by localizing populations, allowing for longer recognition sequences with stronger constraints.

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Area of Science:

  • Origin of Life Studies
  • Biochemistry
  • Theoretical Biology

Background:

  • Non-enzymatic self-replicators are limited by Eigen's error threshold.
  • Enzymatic replication offers potential for higher complexity but faces challenges in competitive environments due to the dual role of enzyme and substrate.

Purpose of the Study:

  • To analyze an idealized quasispecies model for enzymatic replication with specific recognition mechanisms.
  • To investigate how self-specific and cross-specific recognition rates influence population localization and information preservation.

Main Methods:

  • Modeling enzymatic replication using a quasispecies model.
  • Analyzing replication rates as functions of Hamming distance between recognition (tag) sequences.
  • Investigating both self-specific (decreasing function) and cross-specific (increasing function) recognition.

Main Results:

  • Weak self-specificity is sufficient to localize populations around a master sequence, preserving information.
  • Simultaneous localization around complementary sequences in the cross-specific case is more challenging.
  • Stronger specificity constraints surprisingly allow for longer recognition sequences due to improved population localization.

Conclusions:

  • Specific recognition is crucial for maintaining information content in enzymatic replicators.
  • The length of recognition sequences can be extended by increasing specificity constraints.
  • Quantitative estimates for maximal tag sequence length were derived based on experimental data extrapolation.