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Related Experiment Videos

Oriented, active Escherichia coli RNA polymerase: an atomic force microscope study

N H Thomson1, B L Smith, N Almqvist

  • 1Department of Physics, University of California Santa Barbara, Santa Barbara, California 93106, USA.

Biophysical Journal
|January 23, 1999
PubMed
Summary
This summary is machine-generated.

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Researchers imaged single, active Escherichia coli RNA polymerase (RNAP) molecules using atomic force microscopy (AFM). This was achieved by immobilizing RNAP onto ultraflat gold surfaces via specific protein-surface binding methods for enhanced molecular imaging.

Area of Science:

  • Biophysics
  • Surface Science
  • Molecular Biology

Background:

  • Atomic Force Microscopy (AFM) is a powerful tool for imaging biological molecules.
  • Immobilizing single protein molecules with controlled orientation is crucial for studying their function.
  • Ultraflat gold surfaces provide an ideal substrate for high-resolution imaging.

Purpose of the Study:

  • To develop a method for imaging single, oriented, and active Escherichia coli RNA polymerase (RNAP) molecules.
  • To utilize tapping-mode AFM for visualizing RNAP under aqueous buffer conditions.
  • To confirm the activity of immobilized RNAP molecules.

Main Methods:

  • Combining a protein-binding system with ultraflat gold surfaces.
  • Creating a mixed self-assembled monolayer of ethylene-glycol (EG) and N-nitrilotriacetic acid (NTA) alkanethiols on gold.

Related Experiment Videos

  • Specifically immobilizing histidine-tagged RNAP (hisRNAP) via NTA-nickel complexation.
  • Imaging using tapping-mode atomic force microscopy (AFM) under aqueous buffer.

    • Main Results:

    • Successfully imaged single, oriented, active hisRNAP molecules using AFM.
    • Demonstrated specific immobilization of hisRNAP on the NTA-functionalized surface.
    • Observed phase segregation of the mixed alkanethiol monolayer.
    • Confirmed RNAP activity through the production of large RNA transcripts, which were subsequently imaged.

    Conclusions:

    • The combined system enables the imaging of single, oriented, active RNAP molecules under aqueous conditions.
    • This technique provides a novel approach for studying enzyme activity at the single-molecule level.
    • The method is adaptable for visualizing other protein-DNA interactions and enzymatic processes.