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Bacteriophage endolysin Lyt μ1/6: characterization of the C-terminal binding domain

Lenka Tišáková1, Barbora Vidová, Jarmila Farkašovská

  • 1Department of Genomics and Biotechnology, Laboratory of Prokaryotic Biology, Institute of Molecular Biology Slovak Academy of Sciences (IMB SAS), Bratislava, Slovakia.

FEMS Microbiology Letters
|November 26, 2013
PubMed

Insights

The endolysin Lyt μ1/6 from Streptomyces phage μ1/6 has a cell wall binding domain (CBD) crucial for its function. This study demonstrates the binding capability of the Lyt μ1/6 CBD to Streptomyces aureofaciens surfaces.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Actinophage μ1/6 encodes a putative endolysin, Lyt μ1/6, with a modular structure.
  • Endolysins are phage-encoded enzymes that degrade bacterial cell walls, facilitating progeny release.
  • Streptomyces phages commonly possess modular endolysins with conserved C-terminal cell wall binding domains (CBDs).

Discussion:

  • Lyt μ1/6 exhibits a typical two-domain structure: N-terminal catalytic and C-terminal CBD.
  • Bioinformatic analysis identified a PG_binding_1 domain within the Lyt μ1/6 CBD, suggesting peptidoglycan binding.
  • The conserved nature of CBDs across Streptomyces phage endolysins implies a conserved binding mechanism.

Key Insights:

  • The C-terminal domain of Lyt μ1/6 was successfully cloned and expressed in Escherichia coli.
  • Binding assays confirmed that the Lyt μ1/6 CBD, when fused to GFP, specifically binds to the surface of Streptomyces aureofaciens NMU.
  • This validates the functional role of the Lyt μ1/6 CBD in mediating phage-host interaction.

Outlook:

  • Further characterization of the Lyt μ1/6 CBD can aid in understanding phage-bacterial interactions.
  • The identified binding domain could be engineered for targeted delivery or antimicrobial applications.
  • Investigating the precise binding site and mechanism will enhance knowledge of endolysin function.
Keywords:
Streptomyces aureofaciensactinophage μ1/6bindingin silico analysistruncations

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