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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...
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Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...

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Related Experiment Video

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Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions
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Published on: August 27, 2014

Two-dimensional enzyme diffusion in laterally confined DNA monolayers.

Matteo Castronovo1, Agnese Lucesoli, Pietro Parisse

  • 1Department of Biology, Temple University, 1900 North 12th Street, Philadelphia, Philadelphia 19122, USA. matteo.castronovo@temple.edu

Nature Communications
|May 5, 2011
PubMed
Summary

Enzymes confined in brushy matrices cannot access double-stranded DNA (dsDNA) from the top. Instead, they enter from the sides, diffusing within the matrix to perform reactions, offering new biotechnology insights.

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Area of Science:

  • Biochemistry
  • Biotechnology
  • Molecular Biology

Background:

  • Confinement and crowding significantly impact biomolecular function.
  • Understanding these effects can reveal molecular mechanisms and advance biotechnology.
  • Restriction enzyme reactions are fundamental to molecular biology.

Purpose of the Study:

  • To investigate restriction enzyme reactions with double-stranded DNA (dsDNA) under confinement.
  • To explore how matrix density and confinement affect enzyme access and diffusion.
  • To develop a model explaining enzyme behavior in confined environments.

Main Methods:

  • Utilized molecular manipulation techniques.
  • Employed brushy matrices with controlled, variable densities for dsDNA confinement.
  • Designed high-density molecular barriers to limit enzyme diffusion.

Main Results:

  • Enzymes cannot access dsDNA from the top-matrix interface.
  • Enzymes enter the matrix from the sides and diffuse two-dimensionally.
  • High-density barriers effectively arrest enzyme diffusion, controlling reaction sites.

Conclusions:

  • Steric hindrance within the matrix dictates enzyme diffusion pathways.
  • Confinement significantly alters enzyme accessibility and reaction dynamics.
  • This phenomenon has potential implications for novel biotechnology tools and understanding cellular processes.