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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Diffusion01:12

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
Bacterial Translocation and Protein Secretion01:26

Bacterial Translocation and Protein Secretion

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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Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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How to quantify protein diffusion in the bacterial membrane.

Siet M J L van den Wildenberg1, Yves J M Bollen, Erwin J G Peterman

  • 1Department of Physics and Astronomy, VU University, De Boelelaan 1081, 1081HV Amsterdam, The Netherlands.

Biopolymers
|January 18, 2011
PubMed
Summary
This summary is machine-generated.

Quantifying bacterial membrane protein diffusion is crucial for understanding cell functions. This study introduces a new method using single-molecule fluorescence data to reveal heterogeneous protein movement, essential for bacterial processes.

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Area of Science:

  • Membrane biophysics
  • Bacterial cell biology
  • Single-molecule biophysics

Background:

  • Lateral protein diffusion in biological membranes is vital for numerous cellular processes.
  • Studying protein diffusion in bacteria is challenging due to cell size, unlike in eukaryotes.
  • Existing techniques like FCS, FRAP, and SMF have limitations for bacterial applications.

Purpose of the Study:

  • To review experimental techniques for quantifying membrane protein diffusion in bacteria.
  • To propose a novel method for extracting diffusion coefficients from single-molecule fluorescence data.
  • To quantify the diffusion of the bacterial membrane protein TatA.

Main Methods:

  • Review of established diffusion measurement techniques (FCS, FRAP, SMF).
  • Development and application of cumulative probability distributions (CPDs) for analyzing single-molecule fluorescence trajectories.
  • Computer simulations to assess the impact of cell dimensions and membrane curvature.

Main Results:

  • Identified at least two mobile populations of the TatA protein.
  • Determined distinct diffusion coefficients for these populations: 7 nm(2) ms(-1) and 169 nm(2) ms(-1).
  • Demonstrated that CPD analysis effectively quantifies heterogeneous diffusion in bacterial membranes.

Conclusions:

  • The proposed CPD method allows for the extraction of multiple diffusion coefficients from SMF data in bacteria.
  • Heterogeneous diffusion of TatA is essential for its function in protein translocation.
  • This approach is broadly applicable for studying membrane protein dynamics in living bacteria.