NDLI: A Dual-Signaling Mechanism Mediated by the ArcB Hybrid Sensor Kinase Containing the Histidine-Containing Phosphotransfer Domain in Escherichia coli

Content Provider	PubMed Central
Author	Matsushika, Akinori Mizuno, Takeshi
Copyright Year	1998
Abstract	The two components ArcB and ArcA play a crucial role in the signal transduction implicated in the complex transcriptional regulatory network that allows Escherichia coli to sense various respiratory growth conditions. ArcB is a hybrid sensor kinase having multiple phosphorylation sites in its primary amino acid sequence, including a transmitter, a receiver, and a histidine-containing phosphotransfer (HPt) domain. ArcA is a DNA-binding transcriptional regulator with a receiver domain. Results of recent in vitro studies revealed multistep His-to-Asp phosphotransfer circuitry in the ArcB-ArcA signaling system. For this report we conducted a series of in vivo experiments using a set of crucial ArcB mutants to evaluate the regulation of the sdh operon. The results suggested that the phosphorylated His-717 site in the HPt domain of ArcB is essential for anaerobic repression of sdh. Nonetheless, the ArcB mutant lacking this crucial His-717 site does not necessarily exhibit a null phenotype with respect to ArcB-ArcA signaling. The HPt mutant appears to maintain an ability to signal ArcA, particularly under aerobic conditions, which results in a significant repression of sdh. Based on these and other in vivo results, we propose a model in which ArcB functions in its own right as a dual-signaling sensor that is capable of propagating two types of stimuli through two distinct phosphotransfer pathways.
Starting Page	3973
File Format	PDF
ISSN	10985530
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	15
Volume Number	180
Language	English
Publisher	American Society for Microbiology
Publisher Date	1998-08-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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