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Related Concept Videos

Nucleic Acid Structure01:25

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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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The pV diagram, which is a graph of pressure versus volume of the gas under study, is helpful in describing certain aspects of the substance. When the substance behaves like an ideal gas, the ideal gas equation describes the relationship between its pressure and volume. On a pV diagram, it is common to plot an isotherm, which is a curve showing p as a function of V with the number of molecules and the temperature fixed. Then, for an ideal gas, the product of the pressure of the gas and its...
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Related Experiment Video

Updated: Oct 29, 2025

Analyzing and Building Nucleic Acid Structures with 3DNA
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Understanding the structural details of APOBEC3-DNA interactions using graph-based representations.

J C-F Ng1, F Fraternali1

  • 1Randall Centre for Cell and Molecular Biophysics, King's College London, United Kingdom.

Current Research in Structural Biology
|July 8, 2021
PubMed
Summary

Human APOBEC3 enzymes mutate DNA and retroviral DNA. This study uses computational modeling to reveal structural details of A3-DNA interactions and predict DNA sequence preferences for these enzymes.

Keywords:
APOBEC3Protein structural networksProtein-DNA interactionStructural bioinformatics

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • Human APOBEC3 (A3) enzymes are crucial for innate immunity and genome stability.
  • A3 enzymes generate mutations in retroviral DNA and the human genome, implicated in various cancers.
  • Limited structural data exists for A3-DNA interactions across the enzyme family.

Purpose of the Study:

  • To investigate the structural basis of DNA substrate specificity for human APOBEC3 enzymes.
  • To address the differences in structural coverage of A3-DNA interactions using computational methods.

Main Methods:

  • Utilized homology modeling to generate structural models of A3-DNA complexes.
  • Represented A3-DNA interfaces as residue networks (graphs) for quantitative comparison.
  • Performed large-scale in silico mutagenesis of DNA substrates to predict sequence preferences.

Main Results:

  • Graph-based representations effectively highlight key structural features of A3-DNA interfaces.
  • Computational modeling predicted sequence preferences for multiple A3 domains.
  • Identified potential structural determinants for A3 substrate selection.

Conclusions:

  • Computational modeling, particularly graph-based approaches, can elucidate the structural basis of A3 enzyme sequence specificity.
  • These methods facilitate the evaluation of numerous in silico generated structural models.
  • The findings contribute to understanding A3-mediated DNA editing and its implications in disease.