Structural insight into the low affinity between Thermotoga maritima CheA and CheB compared to their Escherichia coli/Salmonella typhimurium counterparts
Park, S.Y., Crane, B.R.(2011) Int J Biol Macromol 49: 794-800
- PubMed: 21816169 
- DOI: https://doi.org/10.1016/j.ijbiomac.2011.07.012
- Primary Citation of Related Structures:  
3T8Y - PubMed Abstract: 
CheA-mediated CheB phosphorylation and the subsequent CheB-mediated demethylation of the chemoreceptors are important steps required for the bacterial chemotactic adaptation response. Although Escherichia coli CheB has been reported to interact with CheA competitively against CheY, we have observed that Thermotoga maritima CheB has no detectable CheA-binding. By determining the CheY-like domain crystal structure of T. maritima CheB, and comparing against the T. maritima CheY and Salmonella typhimurium CheB structures, we propose that the two consecutive glutamates in the β4/α4 loop of T. maritima CheB that is absent in T. maritima CheY and in E. coli/S. typhimurium CheB may be one factor contributing to the low CheA affinity.
Organizational Affiliation: 
School of Systems Biomedical Science, College of Natural Sciences, Soongsil University, Seoul, Republic of Korea. psy@ssu.ac.kr