AI Article Synopsis
- Antibody-drug conjugates (ADCs) using thiol-maleimide chemistry are typically created at neutral or higher pH levels.
- Alkaline conditions can cause instability in disulfide bonds of IgG antibodies, notably affecting IgG2 and IgG4 types, while acidic conditions show different results based on the antibody's disulfide bond configuration.
- ADCs produced from IgG2-A and IgG2-B antibodies under basic conditions had similar drug-to-antibody ratios due to bond scrambling, while acidic conditions influenced conjugate distributions differently.
Article Abstract
Antibody-drug conjugates (ADCs) that are formed using thiol-maleimide chemistry are commonly produced by reactions that occur at or above neutral pHs. Alkaline environments can promote disulfide bond scrambling, and may result in the reconfiguration of interchain disulfide bonds in IgG antibodies, particularly in the IgG2 and IgG4 subclasses. IgG2-A and IgG2-B antibodies generated under basic conditions yielded ADCs with comparable average drug-to-antibody ratios and conjugate distributions. In contrast, the antibody disulfide configuration affected the distribution of ADCs generated under acidic conditions. The similarities of the ADCs derived from alkaline reactions were attributed to the scrambling of interchain disulfide bonds during the partial reduction step, where conversion of the IgG2-A isoform to the IgG2-B isoform was favored.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6284598 | PMC |
| http://dx.doi.org/10.1080/19420862.2018.1521128 | DOI Listing |
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