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• W2802499213 abstract "Protein aggregation can follow different pathways, and these can result in different net aggregation rates and kinetic profiles. α-chymotypsinogen A (aCgn) was used as a model system to quantitatively and qualitatively assess an approach that combines ex situ size-exclusion chromatography (SEC) with in situ laser scattering (LS) to monitor aggregation vs. time. Aggregation was monitored for a series of temperatures and initial dimer (ID) levels for starting conditions that were primarily (> 97%) monomer, and under initial-rate conditions (limited to low monomer conversion-less than 20% monomer mass loss), as these conditions are of most to interest to many pharmaceutical and biotechnology applications. SEC results show that modest decreases of ID levels can greatly reduce monomer loss rates, but do not affect the effective activation energy for aggregation. The normalized aggregation rates determined from LS were typically ∼ 1 order of magnitude higher than the corresponding rates from SEC. Furthermore, LS signals vs. time became variable and highly nonlinear with decreasing ID level, temperature, and/or total protein concentration. Temperature-cycling LS experiments showed this corresponded to conditions where dimer/oligomer seeding was suppressed, and high levels of reversible oligomers (prenuclei) were formed prior to nucleation and growth of stable aggregates. In those conditions, aggregation rates inferred from LS and SEC are greatly different, as the techniques monitor different stages of the aggregation process. Overall, the results illustrate an approach for interrogating non-native protein aggregation pathways, and potential pitfalls if one relies on a single method to monitor aggregation-this holds more generally than the particular methods here." @default.
• W2802499213 created "2018-05-17" @default.
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• W2802499213 date "2018-06-13" @default.
• W2802499213 modified "2023-10-03" @default.
• W2802499213 title "Parallel chromatography and in situ scattering to interrogate competing protein aggregation pathways" @default.
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• W2802499213 doi "https://doi.org/10.1002/pro.3435" @default.
• W2802499213 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6032348" @default.
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