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Area of Science:

  • Molecular Biology
  • Microbiology
  • Biotechnology

Background:

  • Integrons are key genetic elements driving horizontal gene transfer of antimicrobial resistance genes in bacteria.
  • Integron integrase (IntI2) exhibits characteristics suggesting its potential as a gene editing tool.

Purpose of the Study:

  • To investigate the impact of amino acid mutations on the site-specific recombination efficiency of IntI2.
  • To identify critical residues influencing IntI2 activity for potential gene editing applications.

Main Methods:

  • Construction of a random mutation library of IntI2 using error-prone PCR.
  • Screening and analysis of mutants affecting attI2 × attC or attC × attC recombination efficiency.
  • Analysis of mutant residue locations within the predicted three-dimensional structure of IntI2.

Main Results:

  • Thirteen critical amino acid mutations impacting IntI2 site-specific recombination were identified, including at the predicted catalytic site Y301.
  • Nine of these critical mutations are located near Y301, highlighting the importance of this region for IntI2 activity.
  • Minor increases in excision and/or integration activity were observed for mutants P95S, R100K, and S243T.

Conclusions:

  • Specific amino acid residues critically influence IntI2's site-specific recombination activity.
  • Findings provide insights for modifying IntI2 into a targeted gene editing enzyme.
  • This research lays groundwork for developing novel gene editing systems based on integron integrase.