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• W1991034982 endingPage "654" @default.
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• W1991034982 abstract "Staphylococcal protein A is a cell wall constituent of most strains of Staphylococcus aureus, and it is characterized by its binding affinity to some immunological classes. A mutated low molecular weight type protein A (LPA; Mwt = 27 kDa) which consists of the domains, E, D, A, B and 13 residues of the C-domain was prepared in this study. Since LPA does not possess a cell wall-bound region in contrast to wild-type protein A (WPA; Mwt = 42 kDa), we have established a methodology of large scale purification of LPA without using any extracellular expression systems such as Escherichia coli. Using this relatively abundant protein, the immobilization of the LPA with silk fibroin of Bombyx mori was performed. Thermal stability of LPA immobilized with silk fibroin is higher than that of free LPA at high temperature judging from the immunoglobulin G (IgG)-binding affinity. However, the apparent value of its affinity decreased relative to that of immobilized WPA. These results indicate that structural information is essential to explore improvement of IgG-binding affinity of immobilized LPA. Therefore, secondary structure of free LPA was detected by its characteristic helical pattern in circular dichroism (CD) in aqueous solution. In addition to this, tertiary fold of four IgG-binding domains were investigated by two-dimensional 1H-NMR spectra. Four significantly high-field shifted cross-peaks attributed to methyl signals of alanine residues suggest that all four domains pack into a three helix bundle motif in solution. These structural data and properties of IgG-binding affinity suggest that spatial arrangement of four IgG-binding domains are packed into a compact globular molecular shape. This causes a certain active site of immobilized LPA to be buried in the silk fibroin fiber." @default.
• W1991034982 created "2016-06-24" @default.
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• W1991034982 date "1999-04-01" @default.
• W1991034982 modified "2023-10-18" @default.
• W1991034982 title "Spectroscopic investigation of tertiary fold of staphylococcal protein A to explore its engineering application" @default.
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• W1991034982 doi "https://doi.org/10.1016/s0142-9612(98)00220-8" @default.
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