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Journal of Bacteriology, April 2003, p. 2667-2672, Vol. 185, No. 8
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.8.2667-2672.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Global Analysis of Genes Regulated by EvgA of the Two-Component Regulatory System in Escherichia coli

Kunihiko Nishino,1,2,3 Yoshihiko Inazumi,1,3 and Akihito Yamaguchi1,2,3*

Department of Cell Membrane Biology, Institute of Scientific and Industrial Research, Osaka University, Ibaraki,1 Core Research for Evolution Science and Technology, Japan Science and Technology Corporation, Osaka 567-0047,2 Faculty of Pharmaceutical Science, Osaka University, Suita, Osaka 565-0871, Japan3

Received 22 August 2002/ Accepted 28 January 2003


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ABSTRACT
 
The response regulator EvgA controls expression of multiple genes conferring antibiotic resistance in Escherichia coli (K. Nishino and A. Yamaguchi, J. Bacteriol. 184:2319-2323, 2002). To understand the whole picture of EvgA regulation, DNA macroarray analysis of the effect of EvgA overproduction was performed. EvgA activated genes related to acid resistance, osmotic adaptation, and drug resistance.


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TEXT
 
Bacteria have developed signaling systems for eliciting a variety of adaptive responses to their environment. These adaptive responses are often mediated by two-component regulatory systems, generally consisting of a sensor kinase and a response regulator (1, 17, 35, 36, 45). In a previous study, Nishino and Yamaguchi found that the EvgAS two-component system modulates drug resistance of Escherichia coli by regulating the expression of drug transporters (32, 33). The response regulator EvgA modulates the expression of emrKY (20), which encodes a bile salt-specific exporter (31, 33), and yhiUV, which encodes a multidrug exporter (31, 32). Overexpression of EvgA in the background of a deficiency of E. coli major multidrug exporter AcrB (25) confers drug resistance against antibiotics, dyes, and bile salts (33). EvgA also significantly regulates the expression of yfdX, whose function is unknown (32, 33). However, the physiological role of the EvgAS system is unknown.

We hypothesized that EvgA must control the expression of a wide range of genes. E. coli macroarrays have been successfully used to quantify the entire complement of individual mRNA transcripts (5, 7, 44, 46). Therefore, in order to reveal the whole picture of the EvgA-controlled genes, macroarray analysis of the effect of EvgA overproduction was employed in this study.

Effect of overexpression of evgA on gene expression. DNA macroarrays, which contain most of the genomic open reading frames of E. coli (8), allowed comprehensive studies on EvgA-controlled E. coli gene expression. The strain NK1230 has a single copy of evgA in its chromosome and harbors a mock plasmid, pUC119, while NK1231 bears high-copy-number plasmid pUCA, which carries the evgA gene (Table 1). The growth rates of the two strains were indistinguishable (data not shown). The comprehensive transcript profiles of these two strains prepared from exponential-phase cells were compared as follows. Cells were grown at 37°C in Luria-Bertani (LB) medium (41) and were rapidly collected for total RNA extraction when the culture reached an optical density at 600 nm of 0.6. Total RNA was isolated by using an RNeasy Protect Bacteria Mini kit (Qiagen). 33P-labeled cDNAs were prepared from RNA extracted from NK1230 and NK1231 by using cDNA-labeling primers (Sigma-Genosys). Labeled cDNAs were hybridized to the Panorama E. coli gene arrays (Sigma-Genosys), and phosphorimager files and autoradiograms were obtained according to the manufacturer's instructions as described previously (7, 46). The increased evgA gene dosage in NK1231 resulted in a 41.8-fold elevation of cognate evgA transcripts, and the expression of 23 genes (open reading frames) was elevated more than fourfold while the expression of 3 genes was repressed by a factor of at least 4 (Table 2).


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  		TABLE 1. Strains and plasmids


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  		TABLE 2. E. coli genes whose relative expression levels were increased or decreased by evgA amplification

Known genes in EvgA regulon. In previous studies, Nishino and Yamaguchi reported that overproduction of EvgA increases the expression of yhiUV, emrKY, and yfdX (32, 33). In the DNA macroarray analysis, the enhancement of the gene expression of yhiU, yhiV, and yfdX was 1.8-, 4.4-, and 54.4-fold, respectively. Significant enhancement of emrK and emrY was not observed in the macroarray analysis. Therefore, we reinvestigated the EvgA-dependent induction of these genes by quantitative real-time reverse transcription-PCR (qRT-PCR) as follows. Bulk cDNA samples were synthesized from total RNA derived from E. coli cells by using TaqMan reverse transcription reagents (PE Applied Biosystems) and random hexamers as primers. A real-time PCR was performed with each specific primer pair (Table 3) by using SYBR Green PCR Master Mix (PE Applied Biosystems). rrsA of the 16S rRNA gene was chosen as the normalizing gene. The reactions were run on an ABI PRISM 7000 Sequence Detection System (PE Applied Biosystems).


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  		TABLE 3. Primer pairs used to compare transcript levels

The degree of enhancement of expression of yhiU, yhiV, yfdX, emrK, and emrY was 250, 67, 1,600, 15, and 12, respectively (Table 4). The degree of induction measured by macroarray analysis was obviously lower than that measured by qRT-PCR, probably because the dynamic range of the former analysis is narrower than that of the latter measurement. The order of the degree of the enhancement was consistent between assays except for that of yhiU. The unexpectedly low induction of yhiU gene expression measured by the macroarray analysis might be due to the inefficient primers for yhiU used in this analysis. The detection limit of the enhancement in the macroarray analysis was also poorer than was the case with > qRT-PCR, because the former method could not detect the EvgA-dependent enhancement of emrKY genes.


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  		TABLE 4. Fold induction of specific transcripts attributed to evgA amplification as determined by probing of macroarrays and amplification of cDNA samples

Enhanced expression of genes near evgAS. Amplification of the evgA gene elevated the expression of genes located near the evgA gene in the E. coli chromosome (Fig. 1A). That is, two genes (emrKY) upstream and six genes (yfdXWUVE and ypdI) downstream of evgAS were controlled by EvgA. These genes, except for ypdI, are transcribed in the opposite direction from that of evgAS. The emrKY transcript expression was increased as described above. The yfdXWUVE and ypdI transcripts were increased 54-, 6.8-, 1.0-, 3.0-, 4.0-, and 1.9-fold, respectively, in macroarray analysis. qRT-PCR showed increased expression of yfdXWUVE and ypdI by a factor of 1,600, 1,300, 890, 500, 170, and 30, respectively. These values were again larger than the values obtained from the macroarray analysis, while the orders of degree were roughly consistent with each other, except for that of yfdU, which might be due to the inefficient primer for yfdU in the macroarray analysis. It was previously reported that EvgA binds upstream of emrK, and this region contains the inverted repeat sequence TTCTTAC-GTAAGAA (20). By using the SEARCH PATTERN utility (http://genolist.pasteur.fr/Colibri/) we also found that the upstream region of yfdW contains the same sequence (TTCTTAC-GTAAGAA) (Table 5). A similar sequence is also located in the upstream regions of yfdE (TTCTTCA-GTAAGAA), yfdX (TTCTTGC-GTAAGAT), and ypdI (ATCTTAC-GCAAGAA) (Fig. 1A and Table 5). This fact suggests that EvgA may directly regulate yfdE, yfdW, yfdX, and ypdI as well as emrK.



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  		FIG. 1. Two clusters of EvgA-regulated operons and genes. (A) Gene clusters near the evgAS two-component regulatory system. (B) Gene clusters near the yhiUV multidrug exporter system. Arrows denote the direction of transcription. Putative EvgA-binding motifs are indicated by triangles. Expression changes of genes detected by real-time qRT-PCR are indicated under the gene names. Numbers in parentheses indicate the expression level changes detected by macroarray analyses. Kilobase pairs (kb) indicate the position on E. coli chromosomal DNA as annotated on the Coribri website (http://genolist.pasteur.fr/Colibri/). N.D., not determined.


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  		TABLE 5. Putative EvgA-binding motifs in EvgA-regulated genes that are located near evgAS or yhiUVa

Enhanced expression of genes near yhiUV. Amplification of the evgA gene elevated the expression of genes located near yhiUV in the E. coli chromosome (Fig. 1B). That is, seven genes (hdeABD, slp, and yhiDEF) upstream and three genes (gadAX and yhiW) downstream of yhiUV were controlled by EvgA. Regulation of yhiUV by EvgA was described above. The gadAX, hdeABD, slp, and yhiDEFW transcripts were increased 41-, 3.6-, 84-, 42-, 2.7-, 2.0-, 1.2-, 6.2-, 1.9-, and 2.8-fold, respectively, in macroarray analysis. qRT-PCR showed increased expression of gadAX, hdeABD, and yhiEW by a factor of 320, 13, 480, 530, 120, 400, and 17, respectively. These values were again larger than the values obtained from the macroarray analysis, while the orders of degree were roughly consistent between assays. We searched for a putative EvgA-binding motif in the upstream region of them. As a result, we found the motif in the upstream regions of gadA, hdeA, hdeD, slp, yhiD, yhiW, yhiE, and yhiU (Fig. 1B and Table 5). This fact suggests that these genes may be controlled directly by EvgA. The gadA gene encodes a glutamate decarboxylase (Table 2) (5, 10), and hdeA encodes a chaperone-like protein (13). Both gadA and hdeA play important roles in acid survival. slp encodes a carbon starvation-inducible lipoprotein that stabilizes the outer membrane (2). The functions of hdeD and yhiDWEU are not well understood.

Genes downregulated by EvgA. Amplification of evgA caused a decrease in expression of 26 genes by a factor of 2 or more (3 genes that were decreased in expression by a factor of 4 or more are listed in Table 2). Of these genes, 12 were involved in metabolism (ansB [factor of 2.9], aspA [3.8], frdA [2.5], garD [2.0], glpQ [4.5], narG [2.7], pflB [2.2], sgaE [2.9], tdcD [2.1], tdcE [2.4], tnaA [7.1], and tnaL [5.0]), and 7 were involved in motility (fimA [factor of 2.9], fimF [2.8], fimH [2.7], fimI [3.2], fliA [2.2], fliC [2.2], and yebV [2.2]). These data suggest that overexpression of evgA may repress the motility of E. coli. We also investigated the expression level changes of fimAFHI and fliAC by qRT-PCR (Table 4). qRT-PCR showed decreased expression of all of these genes, and decreased values were larger than the values obtained from the macroarray analysis, just as in the case of genes whose expression was increased by EvgA.

Effect of EvgA on acid survival. The list of upregulated genes (Table 2) contains several genes encoding proteins induced at low pH. That is, gadC (formerly called xasA) encodes a probable GABA/glutamate antiporter (11, 16), and gadA and gadB (gadB transcript expression was increased 3.8-fold) encode two glutamate decarboxylases (Table 2) (5, 10). The hdeA-encoded protein has been proposed to have a chaperone-like function under extremely acidic conditions (13). Recently, Hommais et al. reported that gadX (formerly called yhiX; gadX transcript expression was increased 3.6-fold) plays a role in the control of genes induced by low pH (18). This prompted us to study the effect of evgA overexpression on resistance to acidic stress. The overnight (20-h) cultures in LB medium (pH 6.5) were diluted 1:1,000 (dilution to 3 x 106 CFU/ml) into prewarmed LB (pH 2.0). Acid challenge was carried out for 2 h at 37°C. Viable cell counts were determined at 2 h after the acid challenge, and then the percentage of survival was calculated as 100 times the number of CFU per milliliter remaining after acid treatment divided by the initial number of CFU per milliliter at time zero. The normal E. coli cells showed a low level of resistance (0.1% survival) to acid stress. A large increase in resistance (7.9% survival) was measured in evgA-overexpressing cells compared to that measured with the normal cells (a nearly 80-fold increase).

Effect of EvgA on survival under high osmolarity. Several genes induced by EvgA are involved in the response to high osmolarity. That is, the osmC gene, which is induced by high osmolarity (14), showed an increased mRNA level in the evgA-overexpressing cells. The osmY gene expression is also a locus of hyperosmotic stress response (34). The ompA deletion mutant is significantly more sensitive than that of its parent strain to acidic environment and high osmolarity (47), and the expression of this gene was induced by EvgA overproduction. Nakashima et al. reported that the expression of OmpX is affected by both the medium osmolarity and pressure (29). osmCY and ompAX transcript expressions were increased 2.7-, 3.1-, 2.4-, and 3.1-fold, respectively, in macroarray analysis. We analyzed the role of EvgA in the response to osmotic stress. E. coli cells were grown overnight in LB medium. Cells were diluted 1:1,000 in fresh LB medium supplemented with 3 M NaCl for 1 h at 37°C and then were plated on LB. Viable cells were counted after 16 h at 37°C. A 6.5-fold increase in resistance to high ionic strength was measured in the evgA-overexpressing cells (55.7% survival) compared to that measured in the normal cells (8.7% survival).

Conclusions. This work investigated the utility of the macroarray analysis in determining the global effects of evgA gene dosage amplification. In this study, we found a lot of genes whose EvgA dependence was not known previously. We discovered that the increased expression of several genes in the EvgA-overexpressing cells resulted in a better ability of cells to survive at low pH and high osmolarity than that of normal cells.

EvgA affects the expression of gene clusters located near emrKY and yhiUV. Since these two clusters contain several EvgA-binding motifs (Fig. 1), most of these are probably controlled directly by EvgA. EmrKY and YhiUV drug exporters need the outer membrane protein TolC for their function, like some other drug transporters of E. coli (16a, 21, 28, 30). Also, EvgA overproduction moderately increased the expression of tolC (Table 4).

Recently it was reported that expression of the gene cluster located near yhiUV is also increased by a deficit of H-NS protein (18). H-NS is a nucleoid-associated protein that is required for the organization of chromosomal DNA (3, 6, 15, 48), and it also functions as a transcription factor (18, 19). We found that there are several overlapping genes whose expression levels were increased both by EvgA overproduction and by the lack of H-NS (indicated in Table 2) (18). Overproduction of EvgA did not change the expression level of hns detected either by macroarray or by qRT-PCR analysis (Table 4), but the expression level of evgA is increased in the H-NS-deficient strain compared to that of its wild-type parent strain (18). This overlap might be due to EvgA overproduction in the H-NS-deficient strain.

Ma et al. reported that the expression of the acrAB multidrug exporter system is induced by treatment with fatty acids, sodium chloride, or ethanol (24). Lomovskaya et al. reported that the emrAB multidrug exporter system is induced by treatment with salicylic acid or 2,4-dinitrophenol (23). It was reported that the expression of yhiUV is controlled by RpoS (4, 43), a conserved alternative sigma factor, that is needed for E. coli to survive stresses associated with starvation, such as heat shock (22, 27), oxidative stress (22, 27), osmotic challenge (27), and near-UV light (42). These events indicate that there is a strong relationship between regulation of drug transporters and stress responses. EvgS may sense some kind of stress. Bock and Gross suggested that EvgS is connected with the oxidation status of the cell via the link to the ubiquinone pool (9). Recently, information about factors that affect the expression of evgAS was obtained from microarray studies. Specifically, it was found that addition of autoinducer 2, a signaling pheromone of quorum sensing, represses the expression of evgS (12) and that the superoxide-generating agent paraquat represses the expression of evgA (37).

Further investigation of the natural signal that activates EvgS is needed in order to understand the biological significance of the EvgS-EvgA signal transduction system and may provide further insights into the role of multidrug transporters in the physiology of the cell.


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ACKNOWLEDGMENTS
 
We thank Tomofusa Tsuchiya for strain KAM3. K. Nishino is supported by a research fellowship from the Japan Society for the Promotion of Science for Young Scientists. This work was supported by Grants-in-Aid from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.


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FOOTNOTES
 
* Corresponding author. Mailing address: Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan. Phone: 81-6-6879-8545. Fax: 81-6-6879-8549. E-mail: akihito{at}sanken.osaka-u.ac.jp. Back


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Journal of Bacteriology, April 2003, p. 2667-2672, Vol. 185, No. 8
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.8.2667-2672.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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