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Structural and Functional Basis of GenB2 Isomerase Activity from Gentamicin Biosynthesis.

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The enzyme GenB2 catalyzes a key epimerization step in gentamicin biosynthesis. Its unique mechanism, distinct from other PLP-dependent epimerases, involves a crucial N-terminal cysteine residue.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Aminoglycosides, like gentamicin, are vital antibiotics against Gram-negative bacteria.
  • Gentamicin's clinical use is limited by toxicity; its biosynthesis involves multiple enzymes.
  • GenB2 is a pyridoxal-5'-phosphate (PLP)-dependent enzyme in gentamicin biosynthesis, responsible for epimerizing gentamicin C2 and C2a.

Purpose of the Study:

  • To determine the structure of the GenB2 enzyme in its holo and ternary complexes.
  • To elucidate the catalytic mechanism of GenB2, particularly its unique epimerization process.
  • To understand the role of specific amino acid residues in GenB2's enzymatic activity.

Main Methods:

  • X-ray crystallography was used to determine the structures of GenB2 in complex with PMP and substrate analogues.
  • Site-directed mutagenesis was employed to investigate the function of key amino acid residues.
  • Biochemical assays were performed to confirm the epimerase activity.

Main Results:

  • The crystal structures of GenB2 revealed its holo and ternary complexes, providing insights into substrate binding.
  • GenB2, a fold I PLP-dependent enzyme, utilizes a novel catalytic mechanism involving an N-terminal cysteine residue for epimerization.
  • Mutagenesis of the N-terminal cysteine to serine or alanine abolished GenB2's epimerase activity, confirming its essential role.

Conclusions:

  • This study reveals the structural basis and unique mechanism of GenB2, a novel fold I PLP-dependent epimerase.
  • The findings enhance understanding of gentamicin biosynthesis enzymology.
  • The research provides a foundation for engineering novel aminoglycoside derivatives through enzymatic synthesis.