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Related Concept Videos

Factors Affecting Protein-Drug Binding: Protein-Related Factors01:20

Factors Affecting Protein-Drug Binding: Protein-Related Factors

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Drug binding to proteins is a key aspect of pharmacokinetics and can influence a drug's distribution, absorption, and elimination in the body. Several factors, including the drug's physiochemical properties, protein concentration, disease states, and the number of binding sites on the protein, influence this process.
The physicochemical properties of a drug play a significant role in its ability to bind to proteins. Lipophilic drugs, which dissolve in fats, oils, and lipids, can be...
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Factors Affecting Protein-Drug Binding: Drug Interactions01:23

Factors Affecting Protein-Drug Binding: Drug Interactions

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Drug interactions are a critical aspect of pharmacology and can occur when two or more drugs compete for the same binding site. This competition can result in one drug displacing another, altering the effect of the displaced drug. Drug interactions are complex processes that rely heavily on how much of the displacer drug is present and how strongly it can bind to the same sites as the displaced drug.
Displacement interactions can have varying outcomes, ranging from toxicity to virtually...
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Factors Affecting Protein-Drug Binding: Drug-Related Factors01:18

Factors Affecting Protein-Drug Binding: Drug-Related Factors

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Drug binding to proteins is a complex phenomenon influenced by various drug-related factors, each playing a significant role in the interaction between drugs and proteins within the body.
One crucial factor in drug-protein binding is the drug's lipophilicity or its affinity for fat. More lipophilic drugs tend to have higher binding extents. For example, highly lipophilic drugs like cloxacillin exhibit substantial protein binding, with as much as 95% of the drug binding to proteins. In...
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Factors Affecting Protein-Drug Binding: Patient-Related Factors01:29

Factors Affecting Protein-Drug Binding: Patient-Related Factors

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Protein-drug binding, a pivotal aspect of pharmacokinetics, is subject to considerable variability influenced by an array of patient-related factors. The intricate interplay of age, individual differences, and pathological conditions significantly impact the binding dynamics and subsequent pharmacological effects.
Age stands as a key determinant in protein-drug binding. Neonates, characterized by low albumin content, experience heightened concentrations of unbound drugs such as phenytoin and...
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Allosteric Proteins-ATCase01:19

Allosteric Proteins-ATCase

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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to  N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Designing Silk-silk Protein Alloy Materials for Biomedical Applications
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Factors affecting alum-protein interactions.

Min Huang1, Wei Wang2

  • 1Pharmaceutical Research and Development, Biotherapeutic Pharmaceutical Sciences, Pfizer Inc., 1 Burtt Rd, Andover, MA 01810, United States.

International Journal of Pharmaceutics
|March 11, 2014
PubMed
Summary
This summary is machine-generated.

Aluminum adjuvants enhance vaccine immune responses by binding antigens. This study reveals electrostatic interactions are key, with Alhydrogel showing higher antigen capacity than Adjuphos, guiding vaccine formulation.

Keywords:
AdjuvantAdsorptionAlumDesorptionFormulationProtein

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Area of Science:

  • Vaccine Adjuvants
  • Immunology
  • Materials Science

Background:

  • Aluminum-containing adjuvants (alum) are critical in many commercial vaccines.
  • Their immune-boosting effect is linked to antigen adsorption onto adjuvant particles.
  • Understanding antigen-adsorbent interactions is vital for effective vaccine design.

Purpose of the Study:

  • To investigate the adsorption mechanisms and capacities of model proteins on aluminum adjuvants.
  • To identify factors influencing antigen adsorption and desorption on Alhydrogel® and Adjuphos®.
  • To provide insights for optimizing protein antigen-based vaccine formulations.

Main Methods:

  • Surface adsorption experiments using model proteins on Alhydrogel® and Adjuphos®.
  • Analysis of adsorption mechanisms, capacities, and influencing factors.
  • Evaluation of parameters like protein molecular weight, salt concentration, and buffer composition.

Main Results:

  • Electrostatic interactions predominantly drive protein adsorption, with exceptions like ovalbumin.
  • Alhydrogel® demonstrated significantly higher antigen adsorption capacity compared to Adjuphos®.
  • Adsorption capacity was notably influenced by protein molecular weight, NaCl, phosphate buffer, denaturants, and particle size.

Conclusions:

  • Adjuvant formulation requires careful consideration of antigen properties and environmental factors.
  • Optimizing antigen adsorption is crucial for maximizing vaccine efficacy.
  • This research offers guidance for developing improved aluminum-adjuvanted vaccines.