The 1.9 A resolution crystal structure of phosphono-CheY, an analogue of the active form of the response regulator, CheY.Halkides, C.J., McEvoy, M.M., Casper, E., Matsumura, P., Volz, K., Dahlquist, F.W.
(2000) Biochemistry 39: 5280-5286
- PubMed: 10819997
- DOI: 10.1021/bi9925524
- Primary Citation of Related Structures:
- PubMed Abstract:
- Synthesis and Biochemical Characterization of an Analogue of CheY-phosphate, a Signal Transduction Protein in Bacterial Chemotaxis
Halkides, C.J., Zhu, X., Phillion, D.P., Matsumura, P., Dahlquist, F.W.
(1998) Biochemistry 37: 13674
- Uncoupled Phosphorylation and Activation in Bacterial Chemotaxis: the 2.3 A Structure of an Aspartate to Lysine Mutant at Position 13 of CheY
Jiang, M., Bourret, R.B., Simon, M.I., Volz, K.
(1997) J Biol Chem 272: 11850
- Crystal Structures of CheY Mutants Y106W and T87I/Y106W. CheY Activation Correlates with Movement of Residue 106.
Zhu, X., Rebello, J., Matsumura, P., Volz, K.
(1997) J Biol Chem 272: 5000
- Tyrosine 106 Plays an Important Role in Chemotaxis Signal Transduction in Escherichia Coli
Zhu, X.Y., Amsler, C.D., Volz, K., Matsumura, P.
(1996) J Bacteriol 178: 4208
- Uncoupled Phosphorylation and Activation in Bacterial Chemotaxis. The 2.1 A Structure of a Threonine to Isoleucine Mutant at Position 87 of CheY
Ganguli, S., Wang, H., Matsumura, P., Volz, K.
(1995) J Biol Chem 270: 17386
To structurally characterize the activated state of the transiently phosphorylated signal transduction protein CheY, we have constructed an alpha-thiophosphonate derivative of the CheY D57C point mutant and determined its three-dimensional structure at 1 ...
To structurally characterize the activated state of the transiently phosphorylated signal transduction protein CheY, we have constructed an alpha-thiophosphonate derivative of the CheY D57C point mutant and determined its three-dimensional structure at 1.85 A resolution. We have also characterized this analogue with high-resolution NMR and studied its binding to a peptide derived from FliM, CheY's target component of the flagellar motor. The chemically modified derivative, phosphono-CheY, exhibits many of the chemical properties of phosphorylated wild-type CheY, except that it is indefinitely stable. Electron density for the alpha-thiophosphonate substitution is clear and readily interpretable; omit refinement density at the phosphorus atom is greater than 10sigma. The molecule shows a number of localized conformational changes that are believed to constitute the postphosphorylation activation events. The most obvious of these changes include movement of the side chain of the active site base, Lys 109, and a predominately buried conformation of the side chain of Tyr 106. In addition, there are a number of more subtle changes more distant from the active site involving the alpha4 and alpha5 helices. These results are consistent with our previous structural interpretations of other CheY activation mutants, and with our earlier hypotheses concerning CheY activation through propagation of structural changes away from the active site.
Department of Chemistry, University of North Carolina at Wilmington, Wilmington, North Carolina 28403-3297, USA.