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Default alpha-->beta transition of beta-lactoglobulin as evidenced by heteronuclear NMR.

alpha-->beta transition of beta-lactoglobulin as evidenced by heteronuclear NMR.

Related Articles alpha-->beta transition of beta-lactoglobulin as evidenced by heteronuclear NMR.

J Mol Biol. 1998 Nov 6;283(4):731-9

Authors: Kuwata K, Hoshino M, Era S, Batt CA, Goto Y

Whereas bovine beta-lactoglobulin is a predominantly beta-sheet protein, it has a marked alpha-helical preference and can be considered to be a useful model of the alpha-->beta transition, a key issue for understanding the folding and biological function of a number of proteins. In order to understand the mechanism of the alpha-->beta transition, the backbone structures of the recombinant bovine beta-lactoglobulin A in the native state and in the highly helical state induced by 2,2,2-trifluoroethanol were characterized by 1H, 13C and 15N multidimensional NMR spectroscopy. Overall, the secondary structures in the native state were similar to those of the crystal structure. On the other hand, beta-lactoglobulin in the 2,2,2-trifluoroethanol state was composed of many alpha-helical segments. The presence of the persistent alpha-helices in the helical state and the core beta-sheet in the native state suggested that during folding native-like core beta-sheet and several non-native helices are formed first and the remaining beta-sheet is subsequently "induced" through interaction with the pre-existing beta-sheet.

PMID: 9790836 [PubMed - indexed for MEDLINE]



Source: PubMed
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