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APOBEC3A Catalytic Inactivity Mutation Induces Tertiary Structure Destabilization.

Katherine F M Jones1, Mohamed Shehata2, Michael A Carpenter3

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The APOBEC3A E72Q mutation destabilizes the protein, unlike the E72A mutation. A3A E72Q shows poor DNA binding and partial denaturation, making E72A the preferred mutation for APOBEC3A research.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • APOBEC3A (A3A) catalyzes DNA cytosine deamination, contributing to viral and cancer mutagenesis.
  • A3A is a key target for small molecule drug discovery.
  • Catalytic mutations are crucial for studying A3A function and improving recombinant protein expression.

Purpose of the Study:

  • To investigate the impact of the E72Q mutation on A3A protein stability and DNA binding.
  • To compare the properties of A3A E72Q with the commonly used A3A E72A mutation.
  • To provide guidance on selecting appropriate catalytic inactivation mutations for A3A studies.

Main Methods:

  • Differential scanning fluorimetry (DSF) to assess protein thermal stability.
  • Mass spectrometry to analyze protein integrity.
  • DNA binding assays to evaluate single-stranded DNA affinity.

Main Results:

  • The A3A E72Q mutation significantly decreases protein thermal stability compared to A3A E72A and wild-type A3A.
  • A3A E72Q is partially denatured at 37 °C.
  • A3A E72Q exhibits significantly poorer binding affinity to single-stranded DNA than A3A E72A.

Conclusions:

  • The E72Q mutation results in a less stable and functional A3A protein compared to the E72A mutation.
  • A3A E72Q is not a suitable substitute for A3A E72A in biochemical studies requiring catalytic inactivation.
  • A3A E72A is the recommended mutation for catalytic inactivation in most APOBEC3A applications.