Multidimensional 1H and 15N NMR investigation of glutamine-binding protein of Escheri
Multidimensional 1H and 15N NMR investigation of glutamine-binding protein of Escherichia coli.
Related Articles Multidimensional 1H and 15N NMR investigation of glutamine-binding protein of Escherichia coli. J Biomol NMR. 1992 Mar;2(2):149-60 Authors: Tjandra N, Simplaceanu V, Cottam PF, Ho C Specific and uniform 15N labelings along with site-directed mutagenesis of glutamine-binding protein have been utilized to obtain assignments of the His156, Trp32 and Trp220 residues. These assignments have been made not only to further study the importance of these 3 amino acid residues in protein-ligand and protein-protein interactions associated with the active transport of L-glutamine across the cytoplasmic membrane of Escherichia coli, but also to serve as the starting points in the sequence-specific backbone assignment. The assignment of H epsilon 2 of His156 refines the earlier model where this particular proton forms an intermolecular hydrogen bond to the delta-carbonyl of L-glutamine, while assignments of both Trp32 and Trp220 show the variation in local structures which ensure the specificity in ligand binding and protein-protein interaction. Using 3D NOESY-HMQC NMR, amide connectivities can be traced along 8-9 amino acid residues at a time. This paper illustrates the usefulness of combining 15N isotopic labeling and multinuclear, multidimensional NMR techniques for a structural investigation of a protein with a molecular weight of 25,000. PMID: 1422149 [PubMed - indexed for MEDLINE] Source: PubMed |
All times are GMT. The time now is 05:38 AM. |
Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
Copyright, BioNMR.com, 2003-2013