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- W2044733286 abstract "The SARS coronavirus main proteinase (SARS CoV main proteinase) is required for the replication of the severe acute respiratory syndrome coronavirus (SARS CoV), the virus that causes SARS. One function of the enzyme is to process viral polyproteins. The active form of the SARS CoV main proteinase is a homodimer. In the literature, estimates of the monomer−dimer equilibrium dissociation constant, KD, have varied more than 650000-fold, from <1 nM to more than 200 μM. Because of these discrepancies and because compounds that interfere with activation of the enzyme by dimerization may be potential antiviral agents, we investigated the monomer−dimer equilibrium by three different techniques: small-angle X-ray scattering, chemical cross-linking, and enzyme kinetics. Analysis of small-angle X-ray scattering data from a series of measurements at different SARS CoV main proteinase concentrations yielded KD values of 5.8 ± 0.8 μM (obtained from the entire scattering curve), 6.5 ± 2.2 μM (obtained from the radii of gyration), and 6.8 ± 1.5 μM (obtained from the forward scattering). The KD from chemical cross-linking was 12.7 ± 1.1 μM, and from enzyme kinetics, it was 5.2 ± 0.4 μM. While each of these three techniques can present different, potential limitations, they all yielded similar KD values." @default.
- W2044733286 created "2016-06-24" @default.
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- W2044733286 date "2006-11-17" @default.
- W2044733286 modified "2023-09-25" @default.
- W2044733286 title "SARS CoV Main Proteinase: The Monomer−Dimer Equilibrium Dissociation Constant" @default.
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- W2044733286 doi "https://doi.org/10.1021/bi061746y" @default.
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