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Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Lytic Cycle of Bacteriophages01:30

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Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
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In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
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CRISPR and crRNAs02:53

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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.
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Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
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Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
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Related Experiment Video

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Following Cell-fate in E. coli After Infection by Phage Lambda
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Chaperones help TACkle phage infection.

Shally R Margolis1, Alexander J Meeske1

  • 1Department of Microbiology, University of Washington, Seattle, WA, USA.

Cell Host & Microbe
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PubMed
Summary
This summary is machine-generated.

Bacteria use a novel defense mechanism against viruses by sensing phage proteins. A chaperone protein activates a toxin, stopping viral infection and protecting the bacterial cell.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacteriology

Background:

  • Bacteria possess innate antiviral defense systems.
  • The precise mechanisms for detecting and neutralizing bacteriophage infections are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which bacteria sense and respond to bacteriophage infections.
  • To identify the key bacterial components involved in antiviral defense.

Main Methods:

  • Investigated the interaction between bacterial toxin-antitoxin systems and bacteriophage components.
  • Utilized biochemical assays and genetic manipulation to study protein interactions and functional consequences.

Main Results:

  • Identified a bacterial chaperone protein that directly senses a specific bacteriophage protein.
  • Demonstrated that this sensing event triggers the activation of a bacterial toxin, leading to the inhibition of phage replication.
  • Showcased a novel bacterial antiviral strategy mediated by toxin-antitoxin machinery.

Conclusions:

  • Direct sensing of phage proteins by bacterial chaperones is a critical step in initiating an antiviral response.
  • Bacterial toxin-antitoxin systems play a crucial role in combating phage infections.
  • This discovery reveals a new layer of complexity in host-pathogen interactions within the bacterial realm.