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Related Experiment Video

Updated: Aug 2, 2025

High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment
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Biochemically prepared C-reactive protein conformational states differentially affect C1q binding.

Carrie L Moon1, Aml A Alnaas1, Yuheng Cai2

  • 1Department of Chemistry and Biochemistry, University of Denver, Denver, CO 80210, United States.

BBA Advances
|April 21, 2023
PubMed
Summary
This summary is machine-generated.

C-reactive protein (CRP) unfolding reveals distinct structural states. Preparation methods determine if modified CRP retains binding function with complement protein C1q, impacting immune response.

Keywords:
ANSCircular dichroismComplement immune responseDynamic light scatteringELISANon-denaturing PAGETryptophan fluorescencemCRPpCRP

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Area of Science:

  • Biochemistry
  • Immunology
  • Structural Biology

Background:

  • C-reactive protein (CRP) is a key inflammatory marker for various diseases.
  • CRP's biochemical and structural variations influencing complement binding are not well understood.
  • Modified CRP conformations may differentially affect disease states and activate immune responses.

Purpose of the Study:

  • To compare CRP unfolding using chemical denaturants.
  • To identify CRP states that bind the complement immune response protein C1q.
  • To understand how preparation methods affect CRP's biological binding mimicry.

Main Methods:

  • Perturbation of pentameric CRP using guanidine HCl, urea/EDTA, and heat with SDS.
  • Analysis of CRP states using non-denaturing polyacrylamide gel electrophoresis.
  • Measurement of CRP-C1q binding using enzyme-linked immunosorbent assays.

Main Results:

  • All treatments induced a monomeric CRP state.
  • Specific denaturant concentrations or dilute SDS with heat maintained CRP function.
  • CRP function was assessed by its binding to C1q.

Conclusions:

  • CRP unfolding yields monomeric states.
  • CRP's functional binding to C1q depends on specific preparation conditions.
  • The final modified CRP form and its binding mimicry are preparation-dependent.