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Related Concept Videos

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Mechanism of Conjugation

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Updated: May 29, 2026

Following Cell-fate in E. coli After Infection by Phage Lambda
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Published on: October 14, 2011

Phage-derived proteins and conjugates induce pilus detachment.

Addison Frese1,2, Zhi Zhao1,2, Junjie Zhang1,2

  • 1Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, USA.

Journal of Bacteriology
|May 28, 2026
PubMed
Summary

Single-stranded RNA phages use bacterial type IV pili for entry. Researchers found the phage maturation protein (Mat) alone can detach these pili, aiding viral infection and offering new antimicrobial strategies.

Keywords:
AP205Acinetobacterfluospherematuration proteinpilus detachmentssRNA phagetype IV pili

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Area of Science:

  • Microbiology
  • Virology
  • Bacterial Pathogenesis

Background:

  • Antimicrobial resistance is a global health crisis, with ESKAPE pathogens like *Acinetobacter* species causing hospital-acquired infections.
  • Type IV pili (T4P) are virulence factors in *Acinetobacter*, aiding in DNA uptake, biofilm formation, and antibiotic resistance.
  • Single-stranded RNA (ssRNA) phages use T4P as entry receptors, but the mechanism of genome delivery is not fully understood.

Purpose of the Study:

  • To investigate the entry mechanism of ssRNA phage AP205 into *Acinetobacter higginsii*.
  • To identify phage components responsible for T4P detachment, a crucial step for viral genome entry.
  • To understand how ssRNA phages exploit bacterial T4P for host infection.

Main Methods:

  • Bacterial genetics and molecular biology techniques were used to study phage-host interactions.
  • Specific phage components were tested for their ability to induce pilus detachment.
  • Analysis of phage virion structure and its role in the infection process.

Main Results:

  • The phage maturation protein (Mat) was identified as sufficient to induce T4P detachment.
  • The overall structure of the ssRNA phage virion enhances the efficiency of pilus detachment.
  • Mechanistic insights into ssRNA phage exploitation of bacterial T4P were elucidated.

Conclusions:

  • The phage maturation protein (Mat) plays a key role in initiating T4P detachment for ssRNA phage entry.
  • Bacterial T4P are essential virulence factors exploited by ssRNA phages for host infection.
  • Understanding this interaction may lead to novel strategies against antibiotic-resistant *Acinetobacter* infections.