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A genetically engineered protein domain binding to bacterial murein, archaeal pseudomurein, and fungal chitin cell

Ganesh Ram R Visweswaran1, Bauke W Dijkstra, Jan Kok

  • 1Department of Molecular Genetics, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 7, 9747, AG, Groningen, the Netherlands.

Applied Microbiology and Biotechnology
|January 21, 2012
PubMed

Insights

Researchers created a fusion protein combining Lysin Motif (LysM) and pseudomurein cell wall-binding (PMB) domains. This engineered protein effectively binds to bacterial murein and pseudomurein cell walls, as well as fungal chitin.

Area of Science:

  • Microbiology and Biochemistry
  • Cell Wall Structure and Function
  • Protein Engineering

Background:

  • Bacterial cell walls are primarily composed of murein, while some bacteria utilize pseudomurein.
  • Fungal cell walls are characterized by chitin, a polymer distinct from murein and pseudomurein.
  • Specific protein domains, Lysin Motif (LysM) and pseudomurein cell wall-binding (PMB), are known to bind murein and pseudomurein, respectively.

Purpose of the Study:

  • To engineer a novel fusion protein combining LysM and PMB domains.
  • To investigate the binding capabilities of the fusion protein against diverse cell wall polymers.
  • To elucidate the specific contributions of LysM and PMB domains in the fusion protein's binding activity.

Main Methods:

  • Genetic fusion of the LysM (Pfam PF01476) and PMB (Pfam PF09373) domains.
  • Assessment of the fusion protein's binding affinity to murein, pseudomurein, and chitin.
  • Functional analysis of truncated fusion protein variants to determine domain-specific binding.

Main Results:

  • The engineered fusion protein demonstrates robust binding to both murein- and pseudomurein-containing cell walls.
  • The fusion protein also exhibits significant binding to chitin, a key component of fungal cell walls.
  • Binding efficiency is pH-dependent, correlating with the isoelectric point (pI) of the protein.

Conclusions:

  • The LysM domain is responsible for binding to murein and chitin.
  • The PMB domain mediates binding to pseudomurein.
  • This engineered fusion protein offers a versatile tool for targeting diverse microbial cell wall components.

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