The structure of the IIBGlc domain of the Escherichia coli transporter for glucose was determined by multidimensional heteronuclear NMR. The glucose transporter (IICBGlc) belongs to the bacterial phosphotransferase system. It mediates uptake with concomittant phosphorylation of glucose ...
The structure of the IIBGlc domain of the Escherichia coli transporter for glucose was determined by multidimensional heteronuclear NMR. The glucose transporter (IICBGlc) belongs to the bacterial phosphotransferase system. It mediates uptake with concomittant phosphorylation of glucose. The N-terminal IICGlc domain spans the membrane, the C-terminal IIBGlc domain (residues 386-477) contains the phosphorylation site, Cys421. The structure of the subclonal IIB domain was determined based on 927 conformational constraints, including 744 NOE derived upper bounds, 43 constraints of ranges of dihedral angles based on measurements of vicinal coupling constants, and 70 upper and lower bound constraints associated with 35 hydrogen bonds. The distance geometry interpretation of the NMR data is based on the previously published sequence-specific 1H, 15N, and 13C resonance assignments [Golic Grdadolnik et al. (1994) Eur. J. Biochem. 219, 945-952]. The sequence of the secondary structure elements of IIB is alpha 1 beta 1 beta 2 alpha 2 beta 3 beta 4 alpha 3. The basic fold consists of a split alpha/beta-sandwich composed of an antiparallel sheet with strand order beta 1 beta 2 beta 4 beta 3 and three alpha-helices superimposed onto one side of the sheet. The hydrophobic helix alpha 1 is packed against helices alpha 2, alpha 3, and the beta-sheet. The phosphorylation site (Cys421) is at the end of beta 1 on the solvent-exposed face of the sheet surrounded by Asp419, Thr423 Arg424, Arg426, and Gln456 which are invariant in 15 homologous IIB domains from other PTS transporters.
Related Citations:
The Glucose Transporter of Escherichia Coli. Assignment of the 1H, 13C and 15N Resonances and Identification of the Secondary Structure of the Soluble Iib Domain Golic Grdadolnik, S., Eberstadt, M., Gemmecker, G., Kessler, H., Buhr, A., Erni, B. (1994) Eur J Biochem 219: 945
The Glucose Transporter of Escherichia Coli Buhr, A., Flukiger, K., Erni, B. (1994) J Biol Chem 269: 23437
Cysteine Phosphorylation of the Glucose Transporter of Escherichia Coli Meins, M., Jeno, P., Muller, D., Richter, W.J., Rosenbusch, J.P., Erni, B. (1993) J Biol Chem 268: 11604
Glucose-Permease of the Bacterial Phosphotransferase System. Gene Cloning, Overproduction, and Amino Acid Sequence of Enzyme Iiglc Erni, B., Zanolari, B. (1986) J Biol Chem 261: 16398
Organizational Affiliation:
Institut für Organische Chemie und Biochemie, Technische Universität München, Germany.
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