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Antibody Structure01:10

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Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
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Changes in polymorphic forms can significantly influence the bioavailability of poorly soluble drugs. Although the FDA defines pharmaceutical equivalence based on having the same active ingredient, dosage form, and route of administration, it does not automatically disqualify products with different polymorphic forms. This means two products with different polymorphs can still be deemed pharmaceutically equivalent. However, polymorphic differences can affect properties like wettability,...
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Modeling antigen-antibody nanoparticle bioconjugates and their polymorphs.

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  • 1Department of Chemistry, University of North Dakota, Grand Forks, North Dakota 58202, USA.

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We developed a coarse-grained model for nanoparticle-antibody-antigen binding, identifying recognition and anchoring states. This reveals the role of state switching in the melting of nanoparticle-biomolecule crystals.

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Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Nanomaterials integrated with biomolecules enable novel biosensor designs and hybrid structures.
  • Understanding nanoparticle-biomolecule interactions is crucial for advanced applications.

Purpose of the Study:

  • To develop a coarse-grained model for nanoparticles grafted with antibodies binding to antigens.
  • To investigate the thermodynamic and structural properties of resulting hybrid structures.

Main Methods:

  • Coarse-grained molecular simulation.
  • Calculation of thermodynamic and structural features for body-centered cubic, simple cubic, and face-centered cubic phases.
  • Analysis of melt properties.

Main Results:

  • Identified two states in antigen-antibody binding: recognition and anchoring.
  • Determined the stability domains for three crystal polymorphs (BCC, SC, FCC).
  • Elucidated the role of state switching between anchoring and recognition during melting.

Conclusions:

  • The study provides insights into the complex microscopic mechanisms governing nanoparticle-biomolecule systems.
  • Understanding phase stability and melting behavior is key for designing functional hybrid nanomaterials.