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Related Concept Videos

Proofreading01:43

Proofreading

Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme

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Rfold: an exact algorithm for computing local base pairing probabilities.

Hisanori Kiryu1, Taishin Kin, Kiyoshi Asai

  • 1Computational Biology Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2-42 Aomi, Koto-ku, Tokyo, Japan. kiryu-h@aist.go.jp

Bioinformatics (Oxford, England)
|December 7, 2007
PubMed
Summary
This summary is machine-generated.

This study introduces Rfold, an algorithm that accurately computes base pairing probabilities for long DNA sequences with constrained base pair spans. Rfold offers higher sensitivity and more accurate local secondary structure predictions than existing methods.

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Area of Science:

  • Bioinformatics
  • Computational Biology
  • Genomics

Background:

  • Base pairing probability matrices are crucial for analyzing RNA and DNA structural sequences.
  • Existing methods struggle to compute these probabilities for long DNA sequences with constrained base pair spans.
  • There is a need for precise algorithms that handle energy models for secondary structures under span constraints.

Purpose of the Study:

  • To develop an algorithm that exactly computes base pairing probabilities for DNA sequences with a maximal base pair span constraint (W).
  • To create a method for predicting mutually consistent local secondary structures by maximizing expected accuracy.
  • To implement these algorithms in a software package named 'Rfold'.

Main Methods:

  • An algorithm with O(NW2) time and O(N+W2) memory complexity was developed for computing base pairing probabilities under span constraints.
  • A secondary algorithm was designed to predict local secondary structures by maximizing the expected accuracy function.
  • The developed algorithms were implemented in the Rfold software.

Main Results:

  • The new algorithm precisely calculates base pairing probabilities for DNA sequences with constrained maximal base pair spans.
  • Rfold demonstrates higher sensitivity in identifying true base pairs compared to RNAplfold.
  • Rfold's local secondary structure predictions are more accurate than those of RNALfold.

Conclusions:

  • The Rfold software provides an accurate and efficient solution for analyzing DNA secondary structures with span constraints.
  • The developed algorithms advance the field of computational structural biology by enabling more precise RNA and DNA sequence analysis.
  • Rfold is available as open-source C++ software with a test dataset.