| Literature DB >> 10781568 |
O Kwon1, D Georgellis, A S Lynch, D Boyd, E C Lin.
Abstract
The Arc two-component signal transduction system of Escherichia coli regulates the expression of numerous operons in response to respiratory growth conditions. Cellular redox state or proton motive force (Delta(H(+))) has been proposed to be the signal for the membrane-associated ArcB sensor kinase. This study provided evidence for a short ArcB periplasmic bridge that contains a His47. The dispensability of this amino acid, the only amino acid with a pK in the physiological range, renders the Delta(H(+)) model unlikely. Furthermore, results from substituting membrane segments of ArcB with counterparts of MalF indicate that the region does not play a stereospecific role in signal reception.Entities:
Mesh:
Substances:
Year: 2000 PMID: 10781568 PMCID: PMC102008 DOI: 10.1128/JB.182.10.2960-2966.2000
Source DB: PubMed Journal: J Bacteriol ISSN: 0021-9193 Impact factor: 3.490