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Lytic transglycosylases

J V Höltje1

  • 1Max-Planck-Institut für Entwicklungsbiologie, Abteilung Biochemie, Tübingen, Germany.

EXS
|January 1, 1996
PubMed
Summary

Lytic transglycosylases cleave bacterial murein differently than lysozymes, forming unique 1,6-anhydro-N-acetylmuramic acid products. The E. coli Slt70 structure reveals a processive exo-glycosylase with lysozyme-like active sites but lacking a key aspartate residue.

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Area of Science:

  • Microbiology
  • Structural Biology
  • Enzymology

Background:

  • Lytic transglycosylases and lysozymes both cleave the glycosidic bond in bacterial murein.
  • Lytic transglycosylases produce 1,6-anhydro-N-acetylmuramic acid products, distinct from lysozyme's products.
  • The three-dimensional structure and catalytic mechanism of lytic transglycosylases are not fully understood.

Purpose of the Study:

  • To elucidate the structural and mechanistic properties of the soluble lytic transglycosylase Slt70 from E. coli.
  • To compare the structural features of lytic transglycosylases with those of lysozymes.
  • To understand the processive nature of lytic transglycosylases.

Main Methods:

  • X-ray crystallography to determine the three-dimensional structure of E. coli Slt70.
  • Structural comparison with known lysozyme structures.
  • Biochemical characterization to assess enzyme activity and processivity.

Main Results:

  • The E. coli Slt70 enzyme exhibits a doughnut-like structure, potentially enabling it to encircle murein strands.
  • The catalytic center shares structural similarities with lysozymes, despite lacking significant sequence homology and a catalytic aspartate.
  • All characterized lytic transglycosylases function as processive exo-glycosylases.

Conclusions:

  • E. coli Slt70 possesses a unique structure suited for processive cleavage of murein.
  • Lytic transglycosylases represent a distinct class of enzymes from lysozymes, with convergent evolution of catalytic sites.
  • Understanding lytic transglycosylase mechanisms provides insights into bacterial cell wall metabolism and potential antimicrobial targets.

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