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Detergent-free Ultrafast Reconstitution of Membrane Proteins into Lipid Bilayers Using Fusogenic Complementary-charged Proteoliposomes.
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Immobilization Strategies for Functional Complement Convertase Assembly at Lipid Membrane Interfaces.

Saziye Yorulmaz Avsar1,2,3, Joshua A Jackman1,2, Min Chul Kim1,2

  • 1School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798 Singapore.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 7, 2017
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Summary
This summary is machine-generated.

Protein immobilization method critically impacts complement convertase assembly. Covalent attachment of C3b protein to lipid bilayers enables functional convertase formation and inhibitor evaluation, unlike noncovalent methods.

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Area of Science:

  • Biochemistry
  • Immunology
  • Materials Science

Background:

  • Complement convertases are crucial for innate immune responses.
  • Protein adsorption initiates the self-assembly of these complexes.
  • Understanding assembly mechanisms is key for therapeutic development.

Purpose of the Study:

  • Investigate how C3b protein immobilization affects alternative pathway C3 convertase assembly.
  • Compare covalent versus noncovalent tethering strategies on supported lipid bilayers.
  • Evaluate the functional convertase assembly for complement inhibitor screening.

Main Methods:

  • Utilized a supported lipid bilayer platform.
  • Employed Quartz Crystal Microbalance-Dissipation (QCM-D) for real-time kinetic measurements.
  • Assessed C3b protein adsorption and subsequent convertase formation with factors B and D.

Main Results:

  • Covalent immobilization of C3b on maleimide-functionalized bilayers promoted functional C3 convertase assembly.
  • Noncovalent attachment of C3b to negatively charged bilayers allowed protein uptake but not functional convertase formation.
  • The attachment strategy for C3b protein is critical for membrane-associated convertase assembly.

Conclusions:

  • The immobilization method for C3b protein dictates the success of C3 convertase self-assembly.
  • Covalent tethering provides a viable platform for studying functional convertase and evaluating complement inhibitors like compstatin.
  • Findings offer guidance for designing and assessing membrane-associated biomacromolecular complexes.