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Probing intranuclear environments at the single-molecule level.

David Grünwald1, Robert M Martin, Volker Buschmann

  • 1Institute of Physical and Theoretical Chemistry, Rheinische Friedrich-Wilhelms-University, 53115 Bonn, Germany.

Biophysical Journal
|December 11, 2007
PubMed
Summary
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Nuclear structures do not significantly impede average-sized protein mobility. Single-molecule tracking reveals accessible nuclear compartments, suggesting regulation by concentration, not physical barriers.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Nuclear structure and function depend on molecular accessibility.
  • The extent to which nuclear compartments restrict molecular mobility is largely unknown.

Purpose of the Study:

  • To investigate the mobility and accessibility of an average-sized protein within distinct nuclear compartments.
  • To determine if nuclear structures physically limit molecular transport.

Main Methods:

  • Injected fluorescently labeled streptavidin into mouse cells.
  • Tracked single streptavidin molecules in the nucleus using high-speed fluorescence microscopy.
  • Analyzed molecular mobility in various nuclear subcompartments, including heterochromatin and the nucleolus.

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Main Results:

  • All nuclear subcompartments were accessible to streptavidin.
  • Condensed heterochromatin showed transient trapping but did not exclude molecules.
  • The nucleolus allowed unimpeded passage, contrary to conventional microscopy observations.
  • Single-molecule tracking revealed nuclear accessibility not limited by physical structures.

Conclusions:

  • Nuclear processes are likely regulated by reactant concentration and binding site availability, not physical accessibility.
  • Single-molecule tracking offers novel insights into nuclear protein dynamics.
  • Conventional microscopy may misinterpret molecular exclusion in compartments like the nucleolus.