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- W2140069190 abstract "Acid denaturation of Aspergillus niger glucoamylase was studied using different conformational probes. Both far-UV CD spectral signal (MRE222 nm) and tryptophan fluorescence remained unchanged in the pH range, 7.0–3.0 but decreased significantly below pH 3.0, whereas ANS fluorescence showed a marked increase below pH 1.5. Maximal changes in MRE222 nm and ANS fluorescence were noticed at pH 1.0. Acid-denatured state of glucoamylase at pH 1.0 retained a significant amount of secondary structure as reflected from far-UV CD spectra but showed a deformed tertiary structure with significant exposure of nonpolar groups as well as tryptophan residues as revealed by increased ANS fluorescence, decreased tryptophan fluorescence and three-dimensional fluorescence spectral signals and increase in Ksv value in acrylamide quenching experiments. Acid-denatured state showed no significant variation in the CD spectral signal throughout the temperature range, 0–100 °C. However, a late cooperative transition was observed upon GdnHCl treatment, compared to the native enzyme. All these results suggested that the acid-denatured state of glucoamylase at pH 1.0 represented the molten globule-like state." @default.
- W2140069190 created "2016-06-24" @default.
- W2140069190 creator A5009405308 @default.
- W2140069190 creator A5084330827 @default.
- W2140069190 date "2012-05-01" @default.
- W2140069190 modified "2023-09-26" @default.
- W2140069190 title "Formation of molten globule-like state during acid denaturation of Aspergillus niger glucoamylase" @default.
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- W2140069190 doi "https://doi.org/10.1016/j.procbio.2012.02.008" @default.
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