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Related Concept Videos

Ligand Binding Sites02:40

Ligand Binding Sites

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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.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
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Critical reagents for ligand-binding assays: process development methodologies to enable high-quality reagents.

Caroline Kittinger1, Jared Delmar2, Lisa Hewitt3

  • 1Purification Process Sciences, BioPharmaceuticals Development, R&D, AstraZeneca, Gaithersburg, MD 20878, USA.

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|January 12, 2022
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Summary

Developing biotherapeutics relies on ligand-binding assays (LBAs). Process development for generating conjugated critical reagents ensures LBA performance by controlling conjugation, purification, and formulation.

Keywords:
biopharmaceuticalconjugated critical reagentligand-binding assayprocess development

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Area of Science:

  • Biopharmaceutical Development
  • Analytical Chemistry
  • Assay Development

Background:

  • Biotherapeutic development necessitates robust pharmacokinetic/pharmacodynamic (PK/PD) and immunogenicity assays, often utilizing ligand-binding assay (LBA) formats.
  • Conjugated critical reagents, formed by linking biotherapeutics or anti-drug antibodies with labels, are essential for LBA performance.
  • The quality of these conjugated reagents directly influences LBA reliability, underscoring the need for stringent process control during their generation.

Purpose of the Study:

  • To advocate for the integration of process development methodologies into the production of conjugated critical reagents for LBAs.
  • To elucidate the impact of conjugation reactions, purification techniques, and formulation conditions on the quality of critical reagents.
  • To present a practical approach for developing robust process conditions for various molecular classes of critical reagents.

Main Methods:

  • Application of process development methodologies to critical reagent production.
  • Case studies demonstrating the development of process conditions for antibody and peptide-based critical reagents.
  • Evaluation of conjugation chemistry, purification strategies, and formulation parameters.

Main Results:

  • Demonstrated successful development of process conditions for generating conjugated critical reagents.
  • Case studies provided insights into optimizing reagent quality for different molecular types (antibodies, peptides).
  • The developed approach offers a framework for consistent and reliable critical reagent production.

Conclusions:

  • Integrating process development into critical reagent generation is crucial for ensuring LBA performance and biotherapeutic quality control.
  • The presented methodologies and case studies offer a scalable approach for producing high-quality conjugated critical reagents.
  • This strategy supports the reliable development and manufacturing of future biotherapeutics.