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J Bacteriol

Title:		Substrate specificity and function of the pheromone receptor AinR in Vibrio fischeri ES114
Author(s):		Kimbrough JH; Stabb EV;
Address:		"Department of Microbiology, University of Georgia, Athens, Georgia, USA"
Journal Title:		J Bacteriol
Year:		2013
Volume:		20130920
Issue:		22
Page Number:		5223 - 5232
DOI:		10.1128/JB.00913-13
ISSN/ISBN:		1098-5530 (Electronic) 0021-9193 (Print) 0021-9193 (Linking)
Abstract:		"Two distinct but interrelated pheromone-signaling systems, LuxI/LuxR and AinS/AinR, positively control bioluminescence in Vibrio fischeri. Although each system generates an acyl-homoserine lactone (AHL) signal, the protein sequences of LuxI/LuxR and AinS/AinR are unrelated. AinS and LuxI generate the pheromones N-octanoyl-AHL (C8-AHL) and N-3-oxo-hexanoyl-AHL (3OC6-AHL), respectively. LuxR is a transcriptional activator that responds to 3OC6-AHL, and to a lesser extent to C8-AHL. AinR is hypothesized to respond to C8-AHL and, based on homology to Vibrio harveyi LuxN, to mediate the repression of a Qrr regulatory RNA. However, a DeltaainR mutation decreased luminescence, which was not predicted based on V. harveyi LuxN, raising the possibility of a distinct regulatory mechanism for AinR. Here we show that ainR can complement a luxN mutant, suggesting functional similarity. Moreover, in V. fischeri, we observed ainR-dependent repression of a Pqrr-lacZ transcriptional reporter in the presence of C8-AHL, consistent with its hypothesized regulatory role. The system appears quite sensitive, with a half-maximal effect on a Pqrr reporter at 140 pM C8-AHL. Several other AHLs with substituted and unsubstituted acyl chains between 6 and 10 carbons also displayed an AinR-dependent effect on Pqrr-lacZ; however, AHLs with acyl chains of four carbons or 12 or more carbons lacked activity. Interestingly, 3OC6-AHL also affected expression from the qrr promoter, but this effect was largely luxR dependent, indicating a previously unknown connection between these systems. Finally, we propose a preliminary explanation for the unexpected luminescence phenotype of the DeltaainR mutant"
Keywords:		"4-Butyrolactone/analogs & derivatives/metabolism Aliivibrio fischeri/metabolism/*physiology Artificial Gene Fusion Bacterial Proteins/*metabolism Gene Expression Regulation, Bacterial Genes, Reporter Homoserine/analogs & derivatives/metabolism Lactones/me;"
Notes:		"MedlineKimbrough, John H Stabb, Eric V eng Research Support, U.S. Gov't, Non-P.H.S. 2013/09/24 J Bacteriol. 2013 Nov; 195(22):5223-32. doi: 10.1128/JB.00913-13. Epub 2013 Sep 20"