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Related Concept Videos

Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

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):...
Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...
Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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Transdermal drug delivery systems (TDDS) enable the controlled release of drugs across the skin into systemic circulation. They are particularly advantageous for drugs with short half-lives or narrow therapeutic indices, as they maintain consistent plasma concentrations and reduce the risk of subtherapeutic or toxic levels.TDDS are categorized into monolithic, reservoir, and mixed systems. Monolithic systems embed the drug in a polymer matrix, where diffusion governs release. Reservoir systems...
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Parenteral Drug Delivery Systems: Injectables, Implants, and Infusion Devices

Parenteral drug delivery systems play a crucial role in modern therapeutics by enabling the direct administration of drugs into the systemic circulation, bypassing the gastrointestinal tract. These systems are particularly valuable for poorly absorbed oral medications that are unstable in the digestive environment or require rapid onset or sustained therapeutic levels. Delivery is achieved through intravenous, intramuscular, or subcutaneous routes, each selected based on the drug's properties...

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Updated: Jun 7, 2026

Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
10:41

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

Published on: January 4, 2017

Bacterial contact-dependent delivery systems.

Christopher S Hayes1, Stephanie K Aoki, David A Low

  • 1Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara, California 93106, USA.

Annual Review of Genetics
|November 5, 2010
PubMed
Summary
This summary is machine-generated.

Bacteria use specialized cell surface systems to deliver effectors, enhancing survival. These include Type III, IV, V (contact-dependent growth inhibition), and VI secretion systems, each with unique delivery mechanisms.

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Last Updated: Jun 7, 2026

Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
10:41

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Published on: January 4, 2017

Cell Squeezing as a Robust, Microfluidic Intracellular Delivery Platform
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Published on: March 25, 2015

Area of Science:

  • Microbiology
  • Bacterial Cell Biology
  • Molecular Biology

Background:

  • Bacteria possess sophisticated cell-surface systems for intercellular communication and warfare.
  • These systems enable bacteria to sense and interact with neighboring target cells, influencing survival and growth.

Purpose of the Study:

  • To review and categorize the main classes of bacterial cell surface structures involved in effector delivery.
  • To elucidate the distinct mechanisms employed by different bacterial secretion systems.

Main Methods:

  • Literature review of bacterial secretion systems.
  • Comparative analysis of structural and functional characteristics of Type III, IV, V, and VI secretion systems.

Main Results:

  • Identified four primary classes of bacterial cell surface structures for effector delivery: Type III, IV, V (CDI), and VI secretion systems.
  • Described the unique delivery mechanisms: T3SS (flagellum-like tube), T4SS (pilus-based), CDI (surface protein), and T6SS (phage-like tube).
  • Highlighted the diverse targets, including prokaryotic and eukaryotic cells.

Conclusions:

  • Bacterial secretion systems are diverse and crucial for inter-bacterial interactions and host manipulation.
  • Understanding these systems provides insights into bacterial pathogenesis and survival strategies.