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Bacterial Translocation and Protein Secretion01:26

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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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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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Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
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Updated: Jan 26, 2026

Label-Free Imaging of Single Proteins Secreted from Living Cells via iSCAT Microscopy
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Single-Cell Protein Secretion Detection and Profiling.

Zhuo Chen1, Jonathan J Chen1, Rong Fan1,2

  • 1Department of Biomedical Engineering, Yale University, New Haven, Connecticut 06520, USA;

Annual Review of Analytical Chemistry (Palo Alto, Calif.)
|April 13, 2019
PubMed
Summary
This summary is machine-generated.

Researchers review bioanalytical technologies for detecting single-cell protein secretions. Advanced microengineered systems offer multiplex measurement and dynamic tracking, advancing cell communication studies and clinical applications.

Keywords:
multiplex assayprotein secretionsecretion dynamicssingle-cell analysis

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Area of Science:

  • Biotechnology
  • Cell Biology
  • Analytical Chemistry

Background:

  • Secreted proteins are crucial for biological processes like cell communication, differentiation, migration, and homeostasis.
  • Detecting protein secretions from single cells is vital for understanding these complex biological functions.

Purpose of the Study:

  • To review and compare bioanalytical technologies for single-cell protein secretion detection.
  • To highlight advances in microengineered systems for multiplexed and dynamic secretion analysis.
  • To discuss future opportunities for systems-level research and clinical applications.

Main Methods:

  • Review of conventional bioanalytical approaches for protein detection.
  • Detailed analysis of microengineered platforms: droplet microfluidics, micro-/nanowell assays, and microchamber assays.
  • Comparison of advantages and limitations of various microscale systems.

Main Results:

  • Microengineered systems enable sensitive detection and multiplex measurement of single-cell protein secretions.
  • These platforms facilitate tracking of protein secretion dynamics, aiding cell-cell communication network studies.
  • Comparison of different microfluidic and microscale assay technologies.

Conclusions:

  • Microengineered systems represent significant advances in single-cell protein secretion analysis.
  • These technologies enhance the study of cellular secretion functions at the systems level.
  • Future opportunities lie in immune monitoring and cancer treatment applications.