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Updated: Sep 11, 2025

CD Spectroscopy to Study DNA-Protein Interactions
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AlkD's Conformational Dynamics Regulated by Protein-DNA Interactions for Effective Target Recognition.

Yanping Qi1,2, Jiaxin Guo3, Xiaowei Wang4

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.

The Journal of Physical Chemistry Letters
|August 12, 2025
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Summary
This summary is machine-generated.

Bacillus cereus alkylpurine DNA glycosylase (AlkD) uses unique mechanisms to find and remove DNA lesions. Key residues W109 and R148 are crucial for its selectivity towards positively charged DNA damage.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genomics

Background:

  • Bacillus cereus alkylpurine DNA glycosylase (AlkD) repairs DNA damage, particularly cytotoxic positively charged lesions.
  • AlkD utilizes a unique non-base-flipping mechanism with distinct conformational states for DNA searching and lesion excision.

Purpose of the Study:

  • To investigate the lesion recognition mechanism of the AlkD-dsDNA complex.
  • To elucidate the interplay between AlkD's conformational dynamics and its lesion recognition capabilities.

Main Methods:

  • Microsecond-scale molecular dynamics (MD) simulations.
  • Scanning fluorescence resonance energy transfer-fluorescence correlation spectroscopy (FRET-FCS) experiments.
  • Cellular assays.

Main Results:

  • Identified critical residues W109 and R148 as molecular probes for DNA lesion and mismatch recognition.
  • Demonstrated that W109 and R148 alter the equilibrium between search complex (SC) and excision complex (EC) states.
  • Showed enhanced recognition by W109 and R148 for positively charged lesions, explaining AlkD's selectivity.

Conclusions:

  • AlkD's conformational dynamics and residue-specific interactions are key to its DNA repair function.
  • Residues W109 and R148 play a vital role in AlkD's target search and selective lesion recognition.
  • Provides molecular insights into the DNA repair mechanism of AlkD.