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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
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Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis ("cellular eating") is one of three major types of endocytosis. Cells use phagocytosis to take in large objects, such as other cells (or their debris), bacteria, and even viruses.
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Related Experiment Video

Updated: Jan 17, 2026

Live-Cell Imaging of the Life Cycle of Bacterial Predator Bdellovibrio bacteriovorus using Time-Lapse Fluorescence Microscopy
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Two-step localization driven by peptidoglycan hydrolase in interbacterial predation.

Huihui Song1, Yuxiang Zhu1, Zhelin Qu2,3

  • 1MOE Key Laboratory of Evolution and Marine Biodiversity, College of Marine Life Sciences, Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China.

The ISME Journal
|September 19, 2025
PubMed
Summary

Predatory bacteria use a novel two-step strategy, phPLUS, to find and consume prey. This involves a peptidoglycan hydrolase (LssL) that releases signaling molecules, guiding bacterial localization and enhancing predation.

Keywords:
bacterial interactionlocalizationpeptidoglycan hydrolasepredationsignal regulation

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Last Updated: Jan 17, 2026

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Area of Science:

  • Microbiology
  • Ecology
  • Biochemistry

Background:

  • Bacterial predation mechanisms are vital for understanding microbial interactions but remain poorly understood.
  • Predator localization of prey via specific cues is known, but the underlying mechanisms are unclear.

Purpose of the Study:

  • To investigate the dynamic interaction between the predatory bacterium Lysobacter enzymogenes and its prey.
  • To elucidate the novel predation strategy mediated by peptidoglycan hydrolase LssL.

Main Methods:

  • Genetic manipulation
  • Transcriptomic analysis
  • Biochemical assays
  • Live-cell tracking microscopy at the single-cell level

Main Results:

  • A novel predation strategy, peptidoglycan hydrolase-driven Prey Localization and Utilization System (phPLUS), was identified.
  • LssL initiates prey localization by hydrolyzing prey, releasing glycine as a signaling cue for directional movement.
  • Prey signals upregulate LssL expression, synergizing with the type VI secretion system for prey killing.

Conclusions:

  • A new two-step prey localization strategy in bacterial predation was revealed.
  • A previously unrecognized predation process and signal regulation mechanism were highlighted.
  • The study expands understanding of predator-prey interactions and microbial ecological dynamics.