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DNA Sequence Recognition by DNA Primase Using High-Throughput Primase Profiling
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A DNA sequence recognition loop on APOBEC3A controls substrate specificity.

Eric C Logue1, Nicolin Bloch1, Erica Dhuey1

  • 1Department of Microbiology, NYU School of Medicine, New York, New York, United States of America.

Plos One
|May 16, 2014
PubMed
Summary
This summary is machine-generated.

APOBEC3A (A3A) is a DNA deaminase that targets specific DNA sequences. Researchers characterized A3A

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • The APOBEC3 (A3) family comprises seven cytidine deaminases with diverse biological roles.
  • APOBEC3A (A3A) exhibits potent inhibition of adeno-associated virus and endogenous retroelements, but not lentiviruses.
  • Understanding A3A's biochemical properties is crucial for elucidating its biological functions and therapeutic potential.

Purpose of the Study:

  • To characterize the biochemical properties of APOBEC3A (A3A), including DNA binding and target sequence specificity.
  • To identify the structural determinants of A3A's substrate recognition and deamination activity.
  • To compare A3A's properties with other APOBEC3 family members, such as APOBEC3G (A3G).

Main Methods:

  • Biochemical characterization of purified A3A produced in mammalian cells and E. coli.
  • DNA binding assays to determine the dissociation constant (Kd) and oligomeric state of A3A.
  • Oligonucleotide-based assays to identify preferred trinucleotide target sequences.
  • Structural modeling and site-directed mutagenesis to investigate the role of the putative DNA binding groove.
  • Construction and analysis of A3A/A3G chimeric proteins to probe sequence specificity determinants.

Main Results:

  • A3A binds single-stranded DNA with a Kd of 150 nM, existing in both dimeric and monomeric forms.
  • A3A deaminates DNA substrates nonprocessively, with a preferred target sequence of TC(A/G).
  • A putative DNA binding groove and a recognition loop were identified, influencing substrate binding and target specificity.
  • Mutations in the binding groove abolished substrate binding, confirming its critical role.
  • Chimeric proteins revealed a recognition loop that broadened A3A's target sequence preference.

Conclusions:

  • APOBEC3A (A3A) possesses distinct biochemical properties, including nonprocessive deamination and specific DNA binding.
  • Structural elements, such as the DNA binding groove and recognition loop, are critical for A3A's substrate interaction and specificity.
  • These findings provide insights into the mechanism of DNA deamination by APOBEC3 proteins and their role in genome regulation.