AUTHOR CORRECTION Volume 5, no. 6, doi: 10.1128/mBio.02283-14 , 2014. In Results, in the paragraph headed “The VprA-VprB two-component system responds to polymyxin, bile, and mildly acidic pH” (PDF page?5), the fourth and fifth sentences should be modified to read as follows (revised text is indicated in bold): “Alternatively, when wild-type cells were exposed to divalent cations such as Ca~(2+)(10?mM) and Mg~(2+)(10?mM), vprA and almE synthesis was downregulated. It has been reported that a small, but statistically significant, change in the expression of vc1319-vc1320 , also known as carS-R , occurs during growth of V.?cholerae in the presence of Ca~(2+)(77). However, in the current work, statistically significant changes were observed only in almE transcripts (see Fig.?S5A in the supplemental material), suggesting that V.?cholerae moderately responds to divalent cations with a predicted reduction in glycine-lipid A modification.” In Discussion (PDF page?8), the end of paragraph?5 should read as follows (revised text is indicated in bold): “Overall, this study establishes that the VprAB TCS positively regulates the almEFG operon to control glycine-lipid A modification (Fig.?7). Furthermore, the current work is consistent with previous microarray data which show that vc1319-vc1320 is involved in alm gene expression (77).” In References, due to the new text indicated above, the following reference should be added. 77. Bilecen K, Yildiz FH. 2009. Identification of a calcium-controlled negative regulatory system affecting Vibrio cholerae biofilm formation. Environ Microbiol 11:2015–2029. doi:10.1111/j.1462-2920.2009.01923.x.
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