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Related Concept Videos

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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Mechanism of Conjugation01:19

Mechanism of Conjugation

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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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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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Inhibitors of Gram-positive Cell Wall Synthesis01:23

Inhibitors of Gram-positive Cell Wall Synthesis

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Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
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Bacterial Phylum Actinobacteria01:30

Bacterial Phylum Actinobacteria

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Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...
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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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Related Experiment Video

Updated: Apr 8, 2026

Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
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Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation

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Conjugation in Gram-Positive Bacteria.

Nikolaus Goessweiner-Mohr1, Karsten Arends2, Walter Keller1

  • 1Institute of Molecular Biosciences, University of Graz, 8010 Graz, Austria.

Microbiology Spectrum
|June 25, 2015
PubMed
Summary

Conjugative plasmids spread antibiotic resistance via type IV secretion systems. Streptomycetes use a novel mechanism, distinct from standard systems, for plasmid transfer.

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Last Updated: Apr 8, 2026

Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Conjugative plasmids are key vectors for horizontal gene transfer, disseminating antibiotic resistance and virulence factors among bacteria.
  • These plasmids utilize type IV secretion systems (T4SS), comprising origin of transfer (oriT), DNA-processing factors, and mating pair formation (Mpf) proteins encoded by transfer (tra) operons.
  • Streptomycetes, multicellular Gram-positive bacteria, exhibit a unique conjugative plasmid spread mechanism distinct from canonical T4SS.

Purpose of the Study:

  • To analyze the protein players in bacterial conjugative plasmid spread via different mechanisms.
  • To introduce a new classification system for type IV secretion protein families based on secondary structure homology.
  • To discuss the environmental significance of conjugative plasmid transfer and novel in situ visualization techniques.

Main Methods:

  • Comparative analysis of protein factors involved in conjugative plasmid transfer.
  • Development of a secondary structure homology-based classification for type IV secretion proteins.
  • Review of environmental relevance and novel visualization/quantification techniques for conjugative transfer.

Main Results:

  • Identification and characterization of protein key players in two distinct modes of conjugative plasmid spread.
  • Establishment of a novel classification system for type IV secretion protein families.
  • Discussion on the environmental impact and advanced methods for studying plasmid transfer.

Conclusions:

  • Conjugative plasmid transfer is crucial for bacterial adaptation and spread of resistance.
  • The novel classification system aids in understanding T4SS diversity and function.
  • Further research into streptomycete conjugation and advanced imaging techniques will enhance our understanding of horizontal gene transfer.