1ntr
From Proteopedia
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SOLUTION STRUCTURE OF THE N-TERMINAL RECEIVER DOMAIN OF NTRC
Overview
NTRC is a transcriptional enhancer binding protein whose N-terminal domain, is a member of the family of receiver domains of two-component regulatory, systems. Using 3D and 4D NMR spectroscopy, we have completed the 1H, 15N, and 13C assignments and determined the solution structure of the, N-terminal receiver domain of the NTRC protein. Determination of the, three-dimensional structure was carried out with the program X-PLOR, (Brunger, 1992) using a total of 915 NMR-derived distance and dihedral, angle restraints. The resultant family of structures has an average root, mean square deviation of 0.81 A from the average structure for the, backbone atoms involved in well-defined secondary structure. The structure, is comprised of five alpha-helices and a five-stranded parallel, beta-sheet, in a (beta/alpha)5 topology. Comparison of the solution, structure of the NTRC receiver domain with the crystal structures of the, homologous protein CheY in both the Mg(2+)-free and Mg(2+)-bound forms, [Stock, A.M., Mottonen, J. M., Stock, J. B., & Schutt, C. E. (1989) Nature, 337, 745-749; Volz, K., & Matsumura, P. (1991) J. Biol. Chem. 296, 15511-15519; Stock, A. M., Martinez-Hackert, E., Rasmussen, B. F., West, A. H., Stock, J. B., Ringe, D., & Petsko, G. A. (1993) Biochemistry 32, 13375-13380; Bellsolell, L., Prieto, J., Serrano, L., & Coll, M. (1994) J., Mol. Biol. 238, 489-495] reveals a very similar fold, with the only, significant difference occurring in the positioning of helix 4 relative to, the rest of the protein. Examination of the conformation of consensus, residues of the receiver domain superfamily [Volz, K. (1993) Biochemistry, 32, 11741-11753] in the structures of the NTRC receiver domain and CheY, establishes the structural importance of residues whose side chains are, involved in hydrogen bonding or hydrophobic core interactions. The, importance of some nonconsensus residues which may be conserved for their, ability to fulfill helix capping roles is also discussed.
About this Structure
1NTR is a Single protein structure of sequence from Salmonella typhimurium. Full crystallographic information is available from OCA.
Reference
Three-dimensional solution structure of the N-terminal receiver domain of NTRC., Volkman BF, Nohaile MJ, Amy NK, Kustu S, Wemmer DE, Biochemistry. 1995 Jan 31;34(4):1413-24. PMID:7827089
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