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- W2019940733 abstract "We have characterised a series of C-terminal fragments of barnase by different biophysical techniques to find out when they acquire secondary and tertiary native-like structure. Fragments B96-110 (which comprises the last 15 residues of the intact protein) up to B37-110 (which involves most of the protein except the two first helices and a loop) were mainly disordered. Only fragment B23-110, which lacks α-helix1, showed native-like near and far-UV CD and fluorescence spectra. The intensities of these spectra were lower than those of the full-length protein, which suggests the absence of complete side-chain packing. Urea denaturation followed by fluorescence, far-UV CD and gel-filtration chromatography techniques indicated a co-operative transition only for B23-110. None of the fragments melted co-operatively with temperature. Thus, the formation of secondary and tertiary structure requires most of the polypeptide chain to be present, that is, secondary and tertiary structure are formed in parallel. This agrees with the proposed model for barnase folding, where the residual structure in small fragments is weak and flickering, and it is only consolidated when there are enough tertiary interactions. Thus, the development of structure in the series of C-terminal fragments follows a similar behaviour to that observed in the series of N-terminal fragments of barnase." @default.
- W2019940733 created "2016-06-24" @default.
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- W2019940733 date "1999-03-01" @default.
- W2019940733 modified "2023-10-18" @default.
- W2019940733 title "Acquisition of native-like interactions in C-terminal fragments of barnase 1 1Edited by J. Karn" @default.
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- W2019940733 doi "https://doi.org/10.1006/jmbi.1999.2602" @default.
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