Structural highlights
Function
CHEY_THEMA Involved in the transmission of sensory signals from the chemoreceptors to the flagellar motors. CheY seems to regulate the clockwise (CW) rotation (By similarity).
Publication Abstract from PubMed
In bacterial chemotaxis, the levels of phosphorylated CheY in association with FliM determine the sense of the flagella rotation, which in turn controls the bacterial swimming behavior. We report the 1.7A resolution crystallographic structure of the Thermotoga maritima BeF(3)(-)-activated CheY in complex with the CheY-binding N-terminal region of FliM. Analysis of the structure in comparison to the previously reported Escherichia coli counterpart reveals that similar regions of H4-beta5-H5 in CheY and the helix in FliM are used for the complex interfaces. Our structure also indicates that the correlated movement of Phe101 and Ser82 (F-S coupling) in T. maritima CheY upon phosphorylation and FliM binding, parallels that of Tyr106 and Thr87 (Y-T coupling) demonstrated in E. coli CheY. Furthermore, significant displacements of the beta4-H4 loop in both CheYs impose a crucial role of this loop, which can be related to flagellar switch component binding or to propagating changes that is necessary during the CheY-mediated reversal of the motor.
The crystal structure of an activated Thermotoga maritima CheY with N-terminal region of FliM.,Ahn DR, Song H, Kim J, Lee S, Park S Int J Biol Macromol. 2013 Mar;54:76-83. doi: 10.1016/j.ijbiomac.2012.12.003. Epub, 2012 Dec 10. PMID:23237794[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Ahn DR, Song H, Kim J, Lee S, Park S. The crystal structure of an activated Thermotoga maritima CheY with N-terminal region of FliM. Int J Biol Macromol. 2013 Mar;54:76-83. doi: 10.1016/j.ijbiomac.2012.12.003. Epub, 2012 Dec 10. PMID:23237794 doi:http://dx.doi.org/10.1016/j.ijbiomac.2012.12.003
