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Co-immunoprecipitation Assay Using Endogenous Nuclear Proteins from Cells Cultured Under Hypoxic Conditions
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Published on: August 2, 2018

[Study on the interaction between p-HPcZn and myoglobin].

Shao-hua Wei1, Shan Lu, Chun Ji

  • 1School of Chemistry and Environmental Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University, Nanjing 210097, China. shwei@njnu.edu.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|December 20, 2008
PubMed
Summary
This summary is machine-generated.

The study reveals that p-HPcZn interacts strongly with myoglobin, forming a complex that effectively quenches myoglobin fluorescence via static quenching. This interaction also alters myoglobin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Spectroscopy

Background:

  • Myoglobin is a vital protein for oxygen transport.
  • Understanding protein-ligand interactions is crucial in biochemistry.
  • Metalloporphyrins like p-HPcZn can interact with proteins.

Purpose of the Study:

  • To investigate the interaction between p-HPcZn and myoglobin.
  • To determine the mechanism and characteristics of this interaction.
  • To analyze the effect of the interaction on myoglobin's structure and fluorescence.

Main Methods:

  • Fluorescence spectroscopy
  • Synchronous fluorescence spectroscopy
  • Temperature-dependent fluorescence measurements

Main Results:

  • p-HPcZn effectively quenches myoglobin fluorescence.
  • The interaction proceeds via a static quenching mechanism, indicating complex formation.
  • Binding parameters (Ka = 2.481 X 10^5 M^-1) and binding sites (n = 0.444) were determined.
  • The interaction significantly alters myoglobin's conformation.

Conclusions:

  • A strong interaction exists between p-HPcZn and myoglobin.
  • Complex formation and static quenching are key features of this interaction.
  • The binding of p-HPcZn induces conformational changes in myoglobin.