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• W2065252488 abstract "The effect of calcium ions on the structure and stability of recombinant human DNase I (rhDNase) in the aqueous and solid (lyophilized) states was investigated. Fourier transform infrared (FTIR) spectroscopy was used to examine the overall secondary structure, while chemical stability was monitored in terms of deamidation and soluble aggregate formation at 40 °C. The exogenous calcium was removed by EGTA. This process can remove all but approximately one calcium ion per protein molecule. Analysis of the FTIR spectra in the amide III region in either the aqueous or lyophilized state demonstrated that removal of exogenous Ca2+ by EGTA-treatment had little effect on the secondary structure (and lyophilization-induced rearrangement thereof). For the aqueous solution, circular dichroism was used as an independent technique and confirmed that there was no large overall change in the secondary or tertiary structure upon the removal of calcium. The primary degradation route for the aqueous protein was deamidation. For the EGTA-treated protein, there was also severe covalent aggregation, e.g., formation of intermolecular disulfides facilitated by the cleavage of Cys173-Cys209. The aggregates exhibited a markedly different secondary structure compared to the native protein. For instance, the β-sheet band observed at ca. 1620 cm−1 wavenumber in the amide I second derivative spectra was increased. Enzymatic activity was completely lost upon aggregation, consistent with the cleavage of the aforementioned native disulfide. For the protein lyophilized in the presence of Ca2+, there was no increase in deamidated species during solid-state storage; however, some aggregation was observed. For the lyophilized EGTA-treated protein, aggregation was even more pronounced, and there was some loss in enzymatic activity upon reconstitution. Thus, the removal of calcium ions by EGTA-treatment decreased the stability of rhDNase in both the aqueous and solid states even though no large overall calcium-induced structural changes could be observed by the techniques used in this study." @default.
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• W2065252488 date "1999-04-01" @default.
• W2065252488 modified "2023-10-16" @default.
• W2065252488 title "Influence of calcium ions on the structure and stability of recombinant human deoxyribonuclease I in the aqueous and lyophilized states" @default.
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• W2065252488 doi "https://doi.org/10.1021/js980273g" @default.
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