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- W2049967398 abstract "Ovalbumin, a member of the serpin superfamily, is transformed via an intermediate state into a non-cleaved, thermostabilized form (S-ovalbumin) during either the storage of unfertilized eggs or development of fertilized eggs; essentially the same thermostabilization also occurs upon in vitro incubation of isolated ovalbumin under alkaline conditions. To investigate the implications of a partial insertion of the α-helical serpin loop into β-sheet A that has been proposed as a conformational mechanism for S-ovalbumin production, we examined the thermostabilization process of ovalbumin with different loop structures. When the thermostabilization processes were compared for the intact, P1-P1′-cleaved and P1-P1′/P8-P7-cleaved forms of egg white ovalbumin, both the rates for the conversion from the native to intermediate and from the intermediate to S-ovalbumin were almost indistinguishable among the three protein forms. Furthermore, the fully loop-inserted form of recombinant ovalbumin mutant R339T that had been thermostabilized by P1-P1′ cleavage with Tm values from 72 to 88°C was further thermostabilized by an alkaline treatment, yielding a final product (loop inserted S-ovalbumin) with a Tm value of 93°C. No significant difference was found between native ovalbumin and S-ovalbumin in respect of the rate of proteolytic cleavage of the loop by elastase and subtilisin. These data strongly suggest that S-ovalbumin is produced by a mechanism other than that of the partial loop insertion model." @default.
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- W2049967398 date "2003-01-01" @default.
- W2049967398 modified "2023-09-24" @default.
- W2049967398 title "Thermostabilization of Ovalbumin by an Alkaline Treatment: Examination for the Possible Implications of an Altered Serpin Loop Structure" @default.
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- W2049967398 doi "https://doi.org/10.1271/bbb.67.830" @default.
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