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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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DNA Bacteriophages01:26

DNA Bacteriophages

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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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CRISPR and crRNAs02:53

CRISPR and crRNAs

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
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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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Viral Replication: Lytic Cycle01:20

Viral Replication: Lytic Cycle

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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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Viral Structure00:56

Viral Structure

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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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Related Experiment Video

Updated: Aug 13, 2025

A Visual Assay to Monitor T6SS-mediated Bacterial Competition
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Bacterial type VI secretion system (T6SS): an evolved molecular weapon with diverse functionality.

Rajnish Prakash Singh1, Kiran Kumari2

  • 1Department of Bioengineering and Biotechnology, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, 835215, India. manasrajnish2008@gmail.com.

Biotechnology Letters
|January 22, 2023
PubMed
Summary
This summary is machine-generated.

The type VI secretion system (T6SS) is a bacterial nanomachine delivering toxins and effectors. This review details T6SS distribution, structure, effectors, and regulation in bacteria.

Keywords:
EffectorsMicrobiomePlasmidT6SSToxin

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Pathogenesis

Background:

  • Bacterial secretion systems are crucial for virulence and inter-bacterial interactions.
  • The type VI secretion system (T6SS) is a complex nanomachine found in Gram-negative bacteria, structurally resembling bacteriophage puncturing devices.
  • T6SS facilitates the delivery of effector proteins to target cells, impacting bacterial competition and host-pathogen dynamics.

Purpose of the Study:

  • To review the distribution, structure, and function of the T6SS across diverse bacterial species.
  • To elucidate the mechanisms and significance of T6SS-mediated effector protein delivery.
  • To summarize the regulatory networks governing T6SS activity and its role in various environments.

Main Methods:

  • Literature review of studies on bacterial secretion systems, focusing on T6SS.
  • Analysis of genomic and proteomic data to identify T6SS components and effectors.
  • Synthesis of information on T6SS structure, function, regulation, and ecological roles.

Main Results:

  • T6SS is widespread in Gram-negative bacteria, exhibiting conserved and variable structural elements.
  • A diverse arsenal of anti-prokaryotic and anti-eukaryotic effectors has been identified, mediating functions like cell lysis, immune evasion, and colonization.
  • T6SS regulation occurs at multiple levels, including transcriptional, post-transcriptional, and post-translational control.

Conclusions:

  • The T6SS is a versatile system critical for bacterial survival, inter-bacterial competition, and host interactions.
  • Understanding T6SS mechanisms provides insights into bacterial adaptation and potential therapeutic targets.
  • Further research on T6SS in natural environments and its impact on microbiomes is warranted.