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Related Concept Videos

Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

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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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Mechanism of Conjugation01:19

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Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
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Bacterial Translocation and Protein Secretion01:26

Bacterial Translocation and Protein Secretion

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Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
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Conjugation01:19

Conjugation

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Conjugation is a form of horizontal gene transfer that primarily occurs in bacteria and some archaea, promoting genetic diversity and adaptation. Bacteria can acquire resistance genes through conjugative plasmids, allowing them to survive antibiotic treatments that would otherwise be lethal. This process involves direct contact between cells through specialized structures such as the sex pilus and is mediated by conjugative plasmids, including the F (fertility) factor.Conjugation requires...
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Fimbriae, Pili, and Axial Filaments01:28

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Fimbriae and pili are specialized bacterial surface structures that play pivotal roles in adhesion, genetic exchange, and motility. Composed primarily of pilin protein, these hairlike appendages are crucial for bacterial survival and pathogenicity in various environments.Fimbriae: Adhesion and PathogenicityFimbriae are fine, filamentous structures measuring 2–10 nanometers in diameter and are densely distributed on the bacterial cell surface. They facilitate bacterial adhesion to abiotic...
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Transduction01:16

Transduction

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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
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Type IV Secretion Systems and Conjugation in Gram-Negative Pathogens.

Shiqi Zhang1, Faxian Wu1, Huajie Zhao1

  • 1Department of Pathogenic Biology, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, People's Republic of China.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|November 29, 2025
PubMed
Summary
This summary is machine-generated.

Type IV secretion systems (T4SSs) facilitate the spread of antibiotic resistance in Gram-negative pathogens like E. coli. Understanding T4SSs is key to combating hospital-acquired infections and developing new therapeutic targets.

Keywords:
T4SSantibiotic resistanceconjugation

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Gram-negative pathogens (E. coli, K. pneumoniae, A. baumannii, P. aeruginosa) cause major hospital-acquired infections.
  • Widespread antibiotic resistance in these pathogens presents a significant global health challenge.
  • Bacterial conjugation, a horizontal gene transfer mechanism, accelerates the spread of antibiotic resistance.

Purpose of the Study:

  • To review the structure and function of type IV secretion systems (T4SSs).
  • To elucidate the role of T4SSs in the dissemination of antibiotic resistance among key Gram-negative pathogens.
  • To explore T4SSs as potential therapeutic targets for combating antibiotic resistance.

Main Methods:

  • Literature review focusing on T4SS structure, function, and role in bacterial conjugation.
  • Analysis of existing research on antibiotic resistance mechanisms in E. coli, K. pneumoniae, A. baumannii, and P. aeruginosa.
  • Synthesis of information regarding the involvement of T4SSs in horizontal gene transfer of resistance genes.

Main Results:

  • T4SSs are crucial for DNA conjugation, mediating the transfer of genetic material between bacteria.
  • The presence and activity of T4SSs are directly linked to the spread of antibiotic resistance genes among Gram-negative pathogens.
  • Evidence suggests T4SSs are essential for the efficient dissemination of multidrug resistance.

Conclusions:

  • T4SSs play a pivotal role in the spread of antibiotic resistance in common hospital-acquired Gram-negative pathogens.
  • Targeting T4SSs presents a promising strategy for developing novel therapies to combat antimicrobial resistance.
  • Further research into T4SS structure and function can inform the development of effective anti-resistance interventions.