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In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity
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Directed evolution provides insight into conformational substrate sampling by SrtA.

Muna Suliman1, Vishaka Santosh1, Tom C M Seegar1

  • 1Department of Biochemistry and Molecular Biology, Virginia Commonwealth University, Richmond, Virginia, United States of America.

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Summary

Researchers engineered a more efficient Sortase A (SrtA) enzyme using directed evolution. This enhanced SrtA enzyme reveals a novel catalytic mechanism involving significant conformational changes for improved bio-conjugation applications.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Sortase enzymes are crucial transpeptidases in Gram-positive bacteria, essential for cell wall anchoring and pili assembly.
  • Sortases are targets for antimicrobial development and are increasingly used for synthesizing novel bio-conjugates.
  • The native Sortase A (SrtA) enzyme exhibits low catalytic efficiency for synthetic conjugation.

Purpose of the Study:

  • To enhance the catalytic efficiency of the Sortase A (SrtA) enzyme through directed evolution.
  • To elucidate the catalytic mechanism of the engineered SrtA variants.
  • To understand the role of conformational dynamics in SrtA-mediated catalysis.

Main Methods:

  • Directed evolution was employed to select for catalytically enhanced SrtA variants.
  • Structural analyses including NMR and X-ray crystallography were performed.
  • Kinetic data and DEER-EPR spectroscopy were utilized to study enzyme dynamics and mechanism.

Main Results:

  • Directed evolution successfully identified SrtA variants with improved catalytic efficiency.
  • Analysis suggests a novel catalytic mechanism involving large, scissors-like conformational changes upon substrate binding.
  • DEER-EPR spectroscopy confirmed substrate-induced conformational shifts that reposition catalytic residues and substrate.

Conclusions:

  • Understanding Sortase dynamics, particularly conformational changes, is key to improving enzyme engineering.
  • The identified mechanism provides a foundation for designing more efficient sortase-based bio-conjugation tools.
  • This work advances drug discovery and protein engineering efforts leveraging sortase technology.