2022 journal article
Development of peptide affinity ligands for the purification of polyclonal and monoclonal Fabs from recombinant fluids
JOURNAL OF CHROMATOGRAPHY A, 1687.
author keywords: Peptide ligands; Affinity chromatography; Fragment antigen binding; Monoclonal antibodies; Cell culture harvests
MeSH headings : Cricetinae; Animals; Humans; Cricetulus; Ligands; CHO Cells; Molecular Docking Simulation; Protein Binding; Peptides / chemistry; Antibodies, Monoclonal; Chromatography, Affinity
TL;DR:
The de novo discovery of peptide ligands that target different regions of human Fab and enable product release under mild conditions are discovered and afforded values of yield and purity comparable to those provided by Protein L resins.
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UN Sustainable Development Goal Categories
3. Good Health and Well-being
(Web of Science)
Source: Web Of Science
Added: January 17, 2023
Engineered multi-specific monoclonal antibodies (msAbs) and antibody fragments offer valuable therapeutic options against metabolic disorders, aggressive cancers, and viral infections. The advancement in molecular design and recombinant expression of these next-generation drugs, however, is not equaled by the progress in downstream bioprocess technology. The purification of msAbs and fragments requires affinity adsorbents with orthogonal biorecognition of different portions of the antibody structure, namely its Fc (fragment crystallizable) and Fab (fragment antigen-binding) regions or the C H 1-3 and C L chains. Current adsorbents rely on protein ligands that, while featuring high binding capacity and selectivity, need harsh elution conditions and suffer from high cost, limited biochemical stability, and potential release of immunogenic fragments. Responding to these challenges, we undertook the de novo discovery of peptide ligands that target different regions of human Fab and enable product release under mild conditions. The ligands were discovered by screening a focused library of 12-mer peptides against a feedstock comprising human Fab and Chinese hamster ovary host cell proteins (CHO HCPs). The identified ligands were evaluated via binding studies as well as molecular docking simulations, returning excellent values of binding capacity (Q max ∼ 20 mg of Fab per mL of resin) and dissociation constant (K D = 2.16·10 -6 M). Selected ligand FRWNFHRNTFFP and commercial Protein L ligands were further characterized by measuring the dynamic binding capacity (DBC 10% ) at different residence times (RT) and performing the purification of polyclonal and monoclonal Fabs from CHO-K1 cell culture fluids. The peptide ligand featured DBC 10% ∼ 6-16 mg/mL (RT of 2 min) and afforded values of yield (93-96%) and purity (89-96%) comparable to those provided by Protein L resins.