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Structural and functional insights into esterase-mediated macrolide resistance.

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Erythromycin esterases (Eres) confer macrolide antibiotic resistance by cleaving the macrolactone ring. This study reveals the structures and catalytic mechanism of EreC, identifying distinct active site archetypes within the Ere enzyme family.

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Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • Macrolide antibiotics are extensively used in medicine and agriculture.
  • Macrolide resistance in bacteria is a growing concern, often mediated by enzymes.
  • Erythromycin esterases (Eres) are key enzymes conferring resistance through macrolactone ring cleavage.

Purpose of the Study:

  • To elucidate the structural basis of macrolide resistance conferred by erythromycin esterases (Eres).
  • To determine the catalytic mechanism of the Ere enzyme family.
  • To investigate the diversity of active site structures within the Ere family.

Main Methods:

  • X-ray crystallography to determine the 3D structures of EreC.
  • In silico flexible docking studies.
  • Substrate spectrum assays and analysis of residue conservation.

Main Results:

  • Two distinct 3D structures of EreC, a close homolog of EreA, were determined.
  • A detailed catalytic mechanism was proposed, classifying Eres as metal-independent hydrolases.
  • Substrate assays and structural analysis revealed two distinct active site archetypes within the Ere family.

Conclusions:

  • The structural and mechanistic insights into EreC provide a foundation for understanding Ere-mediated macrolide resistance.
  • The identification of distinct active site archetypes suggests potential for developing targeted inhibitors.
  • Further research into the Ere enzyme family is warranted to combat macrolide resistance.