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Area of Science:

  • Microbiology
  • Enzymology
  • Structural Biology

Background:

  • Bacteriophage endolysins are enzymes targeting bacterial cell walls, showing promise as antimicrobials.
  • Typically, Gram-positive endolysins are monomeric with catalytic (CD) and cell wall binding (CWB) domains.

Purpose of the Study:

  • To investigate the expression products of the enterococcal phage F170/08 endolysin gene (lys170).
  • To elucidate the functional interaction between these products and their implications for endolysin structure-function relationships.

Main Methods:

  • Gene expression analysis of lys170.
  • Biochemical characterization of expressed proteins.
  • Bioinformatics analysis of translation start sites and domain organization.

Main Results:

  • Expression of lys170 yielded two proteins: full-length Lys170FL and a C-terminal cell wall binding fragment (CWB170), produced via an alternative start site.
  • Lys170FL and CWB170 interact to form the active endolysin, with CWB170 subunits enhancing substrate binding.
  • Bioinformatics suggests this mechanism of independent CWB subunit production may be conserved.

Conclusions:

  • Endolysin Lys170 utilizes a unique mechanism involving two co-expressed polypeptides for enhanced activity and binding.
  • This discovery presents a novel strategy for increasing cell wall binding motifs in hydrolases, distinct from tandem domain repetition.