Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 64244
Title Apoflavodoxin (un)folding followed at the residue level by NMR
Author(s) Mierlo, C.P.M. van; Oever, J.M.P. van den; Steensma, E.
Source Protein Science 9 (2000). - ISSN 0961-8368 - p. 145 - 157.
Department(s) Biochemistry
Physical Chemistry and Colloid Science
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2000
Abstract The denaturant-induced (un)folding of apoflavodoxin from Azotobacter vinelandii has been followed at the residue level by NMR spectroscopy. NH groups of 21 residues of the protein could be followed in a series of 1H-15N heteronuclear single-quantum coherence spectra recorded at increasing concentrations of guanidinium hydrochloride despite the formation of protein aggregate. These NH groups are distributed throughout the whole apoflavodoxin structure. The midpoints of unfolding determined by NMR coincide with the one obtained by fluorescence emission spectroscopy. Both techniques give rise to unfolding curves with transition zones at significantly lower denaturant concentrations than the one obtained by circular dichroism spectroscopy. The NMR (un)folding data support a mechanism for apoflavodoxin folding in which a relatively stable intermediate is involved. Native apoflavodoxin is shown to cooperatively unfold to a molten globule-like state with extremely broadened NMR resonances. This initial unfolding step is slow on the NMR chemical shift timescale. The subsequent unfolding of the molten globule is faster on the NMR chemical shift timescale and the limited appearance of 1H-15N HSQC cross peaks of unfolded apoflavodoxin in the denaturant range studied indicates that it is noncooperative.
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