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Related Concept Videos

Protein-Drug Binding: Determination Methods01:22

Protein-Drug Binding: Determination Methods

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Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...
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Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
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The Equilibrium Binding Constant and Binding Strength02:18

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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Protein Purification-free Method of Binding Affinity Determination by Microscale Thermophoresis
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A simple micro-method for determining precise oligosaccharidic specificity of mannose-binding lectins.

Henri Debray1, Bernadette Coddeville, Liezelotte R Bomfim

  • 1Unité de Glycobiologie Structurale et Fonctionnelle UMR CNRS/USTL n degrees 8576 Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France. henri.debray@univ-lille1.fr

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A new, cost-effective method rapidly defines mannose-specific lectin interactions with oligomannosides. This technique aids in selecting optimal ligands for structural studies and characterizing complex carbohydrate mixtures.

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Area of Science:

  • Carbohydrate Chemistry
  • Biochemistry
  • Glycobiology

Background:

  • Mannose-specific lectins play crucial roles in biological recognition.
  • Understanding lectin specificity is vital for applications in diagnostics and therapeutics.
  • Oligomannoside structures are key components of N-glycans with diverse biological functions.

Purpose of the Study:

  • To develop a simple, rapid, and inexpensive method for determining the fine specificity of mannose-specific lectins.
  • To enable the selection of optimal oligomannosidic ligands for structural studies of lectin-ligand complexes.
  • To provide a tool for the characterization and fractionation of oligomannose-type structures in complex biological samples.

Main Methods:

  • Preparation of a mixture of N-[(14)C]-acetylated glycoasparagines containing all possible oligomannoside-type N-glycans.
  • Immobilization of mannose-specific lectins onto Sepharose-4B for interaction studies.
  • Separation and visualization of bound glycans using high-performance thin-layer chromatography (HPTLC) and autoradiography.

Main Results:

  • The developed method successfully defined the fine specificity of artocarpin (jackfruit lectin) towards oligomannoside structures.
  • Demonstrated the utility of the method in identifying the best oligomannosidic ligand for a specific lectin.
  • Validated the potential of immobilized lectins, characterized by this method, as tools for glycan analysis.

Conclusions:

  • A novel and efficient method for assessing mannose-specific lectin-oligo-mannoside interactions has been established.
  • This method facilitates the selection of precise ligands for structural and functional studies of lectins.
  • The technique offers a valuable approach for the purification and identification of complex N-glycans.