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• W2001567411 abstract "High pressure 1H/15N two-dimensional NMR spectroscopy has been used to study conformational fluctuation in bovine beta-lactoglobulin at pH 2.0 and 36 degrees C. Pressure dependencies of 1H and 15N chemical shifts and cross-peak intensities were analyzed at more than 80 independent atom sites between 30 and 2000 bar. Unusually large and non-linear chemical shift pressure dependencies are found for residues centering in the hydrophobic core region, suggesting the existence of low-lying excited native states (N') of the protein. Measurement of 1H/15N cross-peak intensities at individual amide sites as a function of pressure suggests that unfolding events occur independently in two sides of the beta-barrel, i.e. the hydrophobic core side (betaF-H) (producing I2) and the non-core side (betaB-E) (producing I1). At 1 bar the stability is higher for the core region (DeltaG0 = 6.5(+/-2.0) kcal/mol) than for the non-core region (4.6(+/-1.3) kcal/mol), but at high pressure the stability is reversed due to a larger DeltaV value of unfolding for the core region (90.0(+/-35.2) ml/mol) than that for the non-core region (57.4(+/-14.4) ml/mol), possibly due to an uneven distribution of cavities. The DeltaG0 profile along the amino acid sequence obtained from the pressure experiment is found to coincide well with that estimated from hydrogen exchange experiments. Altogether, the high pressure NMR experiment has revealed a variety of fluctuating conformers of beta-lactoglobulin, notably N, N', I1, I2 and the totally unfolded conformer U. Fluctuation of N to I1 and I2 conformers with open barrel structures could be a common design of lipocalin family proteins which bind various hydrophobic compounds in its barrel structure." @default.
• W2001567411 created "2016-06-24" @default.
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• W2001567411 date "2001-02-01" @default.
• W2001567411 modified "2023-09-25" @default.
• W2001567411 title "High pressure NMR reveals a variety of fluctuating conformers in β-lactoglobulin" @default.
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• W2001567411 doi "https://doi.org/10.1006/jmbi.2000.4350" @default.
• W2001567411 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11162115" @default.
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