NMR STRUCTURE OF THE C10S MUTANT OF ENZYME IIB CELLOBIOSE OF THE PHOSPHOENOL-PYRUVATE DEPENDENT PHOSPHOTRANSFERASE SYSTEM OF ESCHERICHIA COLI, 17 STRUCTURES
The NMR side-chain assignments and solution structure of enzyme IIBcellobiose of the phosphoenolpyruvate-dependent phosphotransferase system of Escherichia coli.
The assignment of the side-chain NMR resonances and the determination of the three-dimensional solution structure of the C10S mutant of enzyme IIBcellobiose (IIBcel) of the phosphoenolpyruvate-dependent phosphotransferase system of Escherichia coli are presented ...
The assignment of the side-chain NMR resonances and the determination of the three-dimensional solution structure of the C10S mutant of enzyme IIBcellobiose (IIBcel) of the phosphoenolpyruvate-dependent phosphotransferase system of Escherichia coli are presented. The side-chain resonances were assigned nearly completely using a variety of mostly heteronuclear NMR experiments, including HCCH-TOCSY, HCCH-COSY, and COCCH-TOCSY experiments as well as CBCACOHA, CBCA(CO)NH, and HBHA(CBCA)(CO)NH experiments. In order to obtain the three-dimensional structure, NOE data were collected from 15N-NOESY-HSQC, 13C-HSQC-NOESY, and 2D NOE experiments. The distance restraints derived from these NOE data were used in distance geometry calculations followed by molecular dynamics and simulated annealing protocols. In an iterative procedure, additional NOE assignments were derived from the calculated structures and new structures were calculated. The final set of structures, calculated with approximately 2000 unambiguous and ambiguous distance restraints, has an rms deviation of 1.1 A on C alpha atoms. IIBcel consists of a four stranded parallel beta-sheet, in the order 2134. The sheet is flanked with two and three alpha-helices on either side. Residue 10, a cysteine in the wild-type enzyme, which is phosphorylated during the catalytic cycle, is located at the end of the first beta-strand. A loop that is proposed to be involved in the binding of the phosphoryl-group follows the cysteine. The loop appears to be disordered in the unphosphorylated state.
Related Citations:
Enzyme Iibcellobiose of the Phosphoenol-Pyruvate-Dependent Phosphotransferase System of Escherichia Coli: Backbone Assignment and Secondary Structure Determined by Three-Dimensional NMR Spectroscopy Ab, E., Schuurman-Wolters, G.K., Saier, M.H., Reizer, J., Jacuinod, M., Roepstorff, P., Dijkstra, K., Scheek, R.M., Robillard, G.T. (1994) Protein Sci 3: 282
Characterization and Nucleotide Sequence of the Cryptic Cel Operon of Escherichia Coli K12 Parker, L.L., Hall, B.G. (1990) Genetics 124: 455
The Cellobiose Permease of Escherichia Coli Consists of Three Proteins and is Homologous to the Lactose Permease of Staphylococcus Aureus Reizer, J., Reizer, A., Saier Junior, M.H. (1990) Res Microbiol 141: 1061
Organizational Affiliation:
Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, The Netherlands.
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