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Default 1H-NMR characterization of L-tryptophan binding to TRAP, the trp RNA-binding attenuat

1H-NMR characterization of L-tryptophan binding to TRAP, the trp RNA-binding attenuation protein of Bacillus subtilis.

Related Articles 1H-NMR characterization of L-tryptophan binding to TRAP, the trp RNA-binding attenuation protein of Bacillus subtilis.

Biochem J. 1996 May 1;315 ( Pt 3):895-900

Authors: Ramesh V, Brown T

A 1H-NMR study of the binding of L-tryptophan to the trp RNA-binding attenuation protein of Bacillus subtilis (TRAP), an ondecamer (91.6 kDa), has been implemented. The assignment of the aromatic indole ring proton resonances of the bound tryptophan ligand has been successfully carried out by two-dimensional chemical exchange experiments. The observation of only a single set of chemical shifts of the bound ligand demonstrates that the tryptophan binding site is identical in all the 11 subunits of the protein. Further, the large change in ligand chemical shifts suggests that the conformation of tryptophan ligand undergoes a significant rearrangement after complex formation with TRAP. This is further substantiated by the extensive ligand-induced chemical shift changes observed to the protein resonances and identification of several strong ligand-protein intermolecular nuclear Overhauser effects. A correlation of these preliminary NMR data with the X-ray crystal structure of the TRAP-tryptophan complex also suggests, tentatively, that the observed changes to the NMR spectra of the protein might correspond to changes associated with residues surrounding the tryptophan binding pocket owing to complex formation.

PMID: 8645174 [PubMed - indexed for MEDLINE]



Source: PubMed
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