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Default Two- and three-dimensional 1H NMR studies of a wheat phospholipid transfer protein: s

Two- and three-dimensional 1H NMR studies of a wheat phospholipid transfer protein: sequential resonance assignments and secondary structure.

Related Articles Two- and three-dimensional 1H NMR studies of a wheat phospholipid transfer protein: sequential resonance assignments and secondary structure.

Biochemistry. 1991 Dec 10;30(49):11600-8

Authors: Simorre JP, Caille A, Marion D, Marion D, Ptak M

Two- and three-dimensional 1H NMR experiments have been used to sequentially assign nearly all proton resonances of the 90 residues of wheat phospholipid transfer protein. Only a few side-chain protons were not identified because of degeneracy or overlapping. The identification of spin systems and the sequential assignment were made at the same time by combining the data of the two- and three-dimensional experiments. The classical two-dimensional COSY, HOHAHA, and NOESY experiments benefit from both good resolution and high sensitivity, allowing the detection of long-range dipolar connectivities. The three-dimensional HOHAHA-NOESY experiment offers the advantage of a faster and unambiguous assignment. As a matter of fact, homonuclear three-dimensional NMR spectroscopy proved to be a very efficient method for resonance assignments of protein 1H NMR spectra which cannot be unraveled by 2D methods. An assignment strategy which overcomes most of the ambiguities has been proposed, in which each individual assignment toward the C-terminal end is supported by another in the opposite direction originating from a completely different part of the spectrum. Location of secondary structures of the phospholipid transfer protein was determined by using the method of analysis introduced here and was confirmed by 3J alpha NH coupling and NH exchange rates. Except for the C-terminal part, the polypeptide chain appears to be organized mainly as helical fragments connected by disulfide bridges. Further modeling will display the overall folding of the protein and should provide a better understanding of its interactions with lipids.

PMID: 1660724 [PubMed - indexed for MEDLINE]



Source: PubMed
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