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The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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Concanavalin A-polysaccharides binding affinity analysis using a quartz crystal microbalance.

Fohona S Coulibaly1, Bi-Botti C Youan1

  • 1Laboratory of Future Nanomedicines and Theoretical Chronopharmaceutics, Division of Pharmaceutical Sciences, School of Pharmacy, University of Missouri-Kansas City, 2464 Charlotte, Kansas City 64108, MO, USA.

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|April 29, 2014
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Summary
This summary is machine-generated.

This study demonstrates quartz crystal microbalance (QCM) biosensors for analyzing Concanavalin A (Con A) binding to polysaccharides. Con A-mannan interactions show potential for targeted drug delivery applications.

Keywords:
Binding affinityConcanavalin AFrequency shiftGlycogenMannanQCM

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Area of Science:

  • Biochemistry and Biophysics
  • Biosensor Technology
  • Carbohydrate Chemistry

Background:

  • Limited comparative data exists for Concanavalin A (Con A) binding affinities to polysaccharides like glycogen and mannan.
  • Quartz crystal microbalance (QCM) offers a cost-effective and time-efficient platform for biosensor analysis.
  • Con A, a lectin, is known for its specific binding to mannose and glucose residues found in various polysaccharides.

Purpose of the Study:

  • To investigate the feasibility of using QCM in flow injection mode for monitoring Con A-polysaccharide binding.
  • To determine and compare the binding constants (association and dissociation) of Con A with glycogen and mannan.
  • To explore the potential application of Con A-polysaccharide complexes in drug delivery systems.

Main Methods:

  • Immobilization of Con A onto a 5MHz gold crystal surface using carbodiimide crosslinking chemistry.
  • Monitoring Con A attachment efficiency via Fourier Transform Infrared Spectroscopy (FTIR).
  • Quantifying binding affinities through saturation binding experiments using QCM, measuring frequency shifts upon polysaccharide injection.
  • Determining polysaccharide molecular weights (MW) using size exclusion chromatography (SEC).

Main Results:

  • Con A was successfully immobilized on the gold crystal surface.
  • The molecular weights of oyster glycogen and Saccharomyces cerevisiae mannan were determined as 604±0.002 kDa and 54±0.002 kDa, respectively.
  • Equilibrium association (KA) and dissociation (KD) constants for Con A-glycogen were 3.93±0.7×10^6 M⁻¹ and 0.25±0.06 μM, respectively.
  • Frequency and motional resistance shifts (ΔF/ΔR) supported the validity of Sauerbrey's rigidity approximation for both interactions.

Conclusions:

  • QCM is a viable and efficient technique for determining binding constants between immobilized lectins and polysaccharides.
  • The study provides comparative binding data for Con A with glycogen and mannan.
  • The Con A-mannan complex demonstrates potential for targeted insulin delivery and the retrieval of glucose-rich substances and glycoproteins, especially when rapid drug release is required.