The high resolution crystal structures of two interacting proteins from the phosphoenolpyruvate:sugar phosphotransferase system, the histidine-containing phosphocarrier protein (HPr) and the IIA domain of glucose permease (IIA(Glc)) from Bacillus sub ...
The high resolution crystal structures of two interacting proteins from the phosphoenolpyruvate:sugar phosphotransferase system, the histidine-containing phosphocarrier protein (HPr) and the IIA domain of glucose permease (IIA(Glc)) from Bacillus subtilis, provide the basis for modeling the transient binary complex formed during the phosphoryl group transfer. The complementarity of the interacting surfaces implies that no major conformational transition is required. The negatively charged phosphoryl group is buried in the interface, suggesting a key role for electrostatic interactions. It is proposed that the phosphoryl transfer is triggered by a switch between two salt bridges involving Arg-17 of the HPr. The first, prior to phosphoryl group transfer, is intramolecular, with the phosphorylated His-15. The second, during the transfer, is intermolecular, with 2 aspartate residues associated with the active site of IIA(Glc). Such alternating ion pairs may be mechanistically important in other protein-protein phosphotransfer reactions.
Related Citations:
Structure of the Iia Domain of the Glucose Permease of Bacillus Subtilis at 2.2 Angstroms Resolution Liao, D.-I., Kapadia, G., Reddy, P., Saier Junior, M.H., Reizer, J., Herzberg, O. (1991) Biochemistry 30: 9583
Crystallization of the Iia Domain of the Glucose Permease of Bacillus Subtilis Kapadia, G., Chen, C.C.H., Reddy, P., Saier Junior, M.H., Reizer, J., Herzberg, O. (1991) J Mol Biol 221: 1079
Three-Dimensional Structure of the Escherichia Coli Phosphocarrier Protein IIIGlc Worthylake, D., Meadow, N.D., Roseman, S., Liao, D.-I., Herzberg, O., Remington, S.J. (1991) Proc Natl Acad Sci U S A 88: 10382
Organizational Affiliation:
Center for Advanced Research in Biotechnology, Maryland Biotechnology Institute, University of Maryland, Rockville 20850.
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