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Related Concept Videos

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...

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CD Spectroscopy to Study DNA-Protein Interactions
06:48

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Published on: February 10, 2022

A sensitive method based on fluorescence-detected circular dichroism for protein local structure analysis.

Tatsuo Nehira1, Kaoru Ishihara, Koichi Matsuo

  • 1Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan. tnehira@hiroshima-u.ac.jp

Analytical Biochemistry
|September 4, 2012
PubMed
Summary

We developed an improved fluorescence-detected circular dichroism (FDCD) method for analyzing protein structures. This technique uses a novel device to detect subtle tertiary structural changes and pinpoint local protein structures with high sensitivity.

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Area of Science:

  • Biochemistry
  • Spectroscopy
  • Structural Biology

Background:

  • Conventional circular dichroism (CD) spectroscopy is limited in detecting subtle tertiary structural changes in proteins.
  • Analyzing protein structures in complex biological solutions remains challenging.

Purpose of the Study:

  • To report an improved fluorescence-detected circular dichroism (FDCD) analytical method for probing protein three-dimensional structures.
  • To introduce a novel FDCD device with an ellipsoidal mirror that eliminates artifacts and enhances sensitivity.
  • To demonstrate the method's applicability to diverse proteins and its ability to detect localized structural changes.

Main Methods:

  • Development of a novel FDCD device incorporating an ellipsoidal mirror for use with standard CD spectrometers.
  • Application of the FDCD method using intrinsic tryptophan fluorescence or introduced fluorescent labels.
  • Utilizing FDCD to monitor structural changes in metmyoglobin during pH-induced denaturation.
  • Observing structural alterations in fluorescently labeled calmodulin upon Ca(2+) binding and peptide interactions.

Main Results:

  • The improved FDCD method is applicable to both intrinsically fluorescent and labeled proteins.
  • FDCD detected tertiary structural changes in metmyoglobin during pH-induced denaturation, which were undetectable by conventional CD.
  • FDCD enabled selective observation of target proteins in complex solutions and pinpointed local structural changes in calmodulin.

Conclusions:

  • The novel ellipsoidal mirror FDCD device offers an artifact-free approach for protein structure analysis.
  • FDCD spectroscopy provides enhanced sensitivity for detecting tertiary structural changes and localized structural information.
  • FDCD represents a valuable tool for "pinpoint analysis" of protein structures in biological contexts.