Abstract:
:In the Staphylococcus aureus ATCC25923 strain, the flqB mutation in the 5'untranslated region (5'UTR) of the norA gene causes increased norA mRNA expression and high efflux activity (HEA). The involvement of the norA gene 5'UTR in HEA has not been explored in S. epidermidis; therefore, we examined the function of this region in S. epidermidis clinical isolates. The selection of isolates with HEA was performed based on ethidium bromide (EtBr) MIC values and efflux efficiency (EF) using the semi-automated fluorometric method. The function of the 5'UTR was studied by quantifying the levels of norA expression (RT-qPCR) and by identifying 5'UTR mutations by sequence analysis. Only 10 isolates from a total of 165 (6.1%) had HEA (EtBr MIC = 300 μg/ml and EF ranged from 48.4 to 97.2%). Eight of 10 isolates with HEA had the 5'UTR 95ΔG mutation. Isolates carrying the 95ΔG mutation had higher levels of norA expression compared with those that did not. To corroborate that the 95ΔG mutation is involved in HEA, a strain adapted to EtBr was obtained in vitro. This strain also presented the 95ΔG mutation and had a high level of norA expression and EF, indicating that the 95ΔG mutation is important for the HEA phenotype. The 95ΔG mutation produces a different structure in the Shine-Dalgarno region, which may promote better translation of norA mRNA. To our knowledge, this is the first report to demonstrate the participation of the 5'UTR 95ΔG mutation of the norA gene in the HEA phenotype of S. epidermidis isolates. Here, we propose that the efflux of EtBr is caused by an increment in the transcription and/or translation of the norA gene.
journal_name
Microb Pathogjournal_title
Microbial pathogenesisauthors
García-Gómez E,Jaso-Vera ME,Juárez-Verdayes MA,Alcántar-Curiel MD,Zenteno JC,Betanzos-Cabrera G,Peralta H,Rodríguez-Martínez S,Cancino-Díaz ME,Jan-Roblero J,Cancino-Diaz JCdoi
10.1016/j.micpath.2016.12.021subject
Has Abstractpub_date
2017-02-01 00:00:00pages
139-148eissn
0882-4010issn
1096-1208pii
S0882-4010(16)30258-3journal_volume
103pub_type
杂志文章abstract::Animal studies with Candida albicans have provided models for understanding fungal virulence and antifungal drug development. To non-invasively monitor long-term Candida murine infections, clinical isolates were stably transformed with a codon-optimized luciferase gene to constitutively express luciferase. Chronic sys...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2005.11.003
更新日期:2006-02-01 00:00:00
abstract::The re-emerging field of phage therapy is the potential biocontrol agents for the transfer of virulence factor and to kill their bacterial hosts. In this study, the lytic Vibrio vulnificus phages were studied to provide a better understanding of phage-host interactions and development of phage therapy. Four new V. vul...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2017.09.024
更新日期:2017-10-01 00:00:00
abstract::A. baumannii has been considered as Priority-I as suggested by the World Health Organization (WHO) and the most critical pathogenic microorganism for causing nosocomial infection in imunno-compromised hospital-acquired patients due to multi-drug resistance (MDR). In the current study, we utilized "Computer-aided ligan...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2020.104205
更新日期:2020-10-01 00:00:00
abstract::In the present study, we isolated Lactobacillus sakei strain DGH5 from raw beef meat. This bacterium plays an inhibitory effect against food-spoiling bacteria and food-borne pathogens, including Listeria monocytogenes, a gram-positive and pathogenic bacterium. Lactobacillus sakei strain DGH5 was identified through bot...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2017.02.008
更新日期:2017-05-01 00:00:00
abstract::CpG DNA is a potent activator of the innate immune system. Here the protective effects of CpG DNA are assessed against the facultative intracellular pathogen Francisella tularensis. Dosing of mice with CpG DNA provided protection against disease caused by F. tularensis subsp. holarctica live vaccine strain (LVS) but d...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2013.04.013
更新日期:2013-10-01 00:00:00
abstract::Our previous studies have shown that the adhesive ability of Enterococcus faecalis is dependent on the strain and is further modified by growth in serum. The data reported here demonstrate that E. faecalis adherence is mediated by carbohydrate residues present on the bacterial cell surface. Some of these (D-mannose an...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/0882-4010(91)90036-a
更新日期:1991-12-01 00:00:00
abstract::Adhesion is the first step for Candida species to form biofilms on medical devices implanted in the human host. Both the physicochemical nature of the biomaterial and cell wall proteins (CWP) of the pathogen play a determinant role in the process. While it is true that some CWP have been identified in vitro, little is...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2017.04.009
更新日期:2017-06-01 00:00:00
abstract::Recently, microbial exopolysaccharides (EPSs) have offered very large field for medical applications owing to their bioactive characteristics. This study aimed to obtain antitumor EPS and to optimize its production using different optimization approaches. Eighty EPSs-producing bacteria were obtained from mud samples. ...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2019.103947
更新日期:2020-03-01 00:00:00
abstract::ADP-ribosylating protein exotoxins from Vibrio cholerae (CT) and Escherichia coli (LT-I) share two short regions of sequence similarity with Bordetella pertussis toxin (PT). Previous studies have indicated that substitution of arginine for lysine 7 within the first region of CT drastically decreases ADP ribosyltransfe...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1006/mpat.1994.1079
更新日期:1994-11-01 00:00:00
abstract::We analyzed here the complete genome sequences of a highly virulent Flavobacterium columnare Pf1 strain isolated in our laboratory. The complete genome consists of a 3,171,081 bp circular DNA with 2784 predicted protein-coding genes. Among these, 286 genes were predicted as antibiotic resistance genes, including 32 RN...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2017.08.035
更新日期:2017-10-01 00:00:00
abstract::Fast emerging antibiotic resistance in pathogens requires special attention for strengthening the reservoir of antimicrobial compounds. In view of this, several peptides with known antimicrobial activities have been reported to enhance the efficacy of antibiotics against multidrug resistant (MDR) pathogens. In the pre...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2018.08.023
更新日期:2018-11-01 00:00:00
abstract::The goal of this study was to demonstrate the participation in cellular damage of a Trichomonas vaginalis proteinase with a molecular mass of 65 kDa (CP65). By two dimensional gelatin-gel electrophoresis of trichomonad proteins we detected four spots with proteolytic activity on the 65 kDa region, but only one, pI 7.2...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1006/mpat.1999.0336
更新日期:2000-04-01 00:00:00
abstract::Uropathogenic Escherichia coli (UPEC) comprise a heterogeneous group of strains. In a previous epidemiological survey performed on 230 UPEC isolates, five virulence profiles were described, each one defined by the presence of some virulence determinants and by the absence of others. Phylogenetic groups and antibiotic ...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2014.11.002
更新日期:2014-12-01 00:00:00
abstract::Iron is an environmental signal which regulates the coordinate expression of genes associated with virulence in many pathogenic bacteria. In response to iron-deprivation, lysogenic Corynebacterium diphtheriae C7 (beta) synthesizes and secretes diphtheria toxin and siderophore and induces a high-affinity iron uptake sy...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/0882-4010(90)90015-i
更新日期:1990-10-01 00:00:00
abstract::Animals nurtured with a high-concentrate diet for a more extended period can cause subacute ruminal acidosis (SARA). In this study, twelve mid-lactating goats were separated into two groups (n = 6): a high concentrate diet (HC) control and a high concentrate with buffer (HCB) treatment group. Rumen fistula was install...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2018.05.045
更新日期:2018-09-01 00:00:00
abstract::In this study we generated and characterized a series of monoclonal antibodies (mAbs) against GII.6 norovirus (NoV) virus like particles (VLPs). Mice were immunized with purified GII.6 NoV VLPs and peptide-bovine serum albumin (BSA) conjugates with the peptide sequence (31 aa) derived from the trypsin cleavage region....
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2020.104100
更新日期:2020-02-26 00:00:00
abstract::A cytotoxin to Vero cells (Shiga-like toxin), which was neutralized by antibody against purified Shiga toxin produced by Shigella dysenteriae 1, was purified from Escherichia coli O157:H7, isolated from a patient with hemorrhagic colitis. The purification procedure consisted of ammonium sulfate fractionation, DEAE-cel...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/0882-4010(87)90076-3
更新日期:1987-05-01 00:00:00
abstract::Two-component regulatory proteins, histidine kinases and response regulators, function in bacteria as sensing and adaptive factors in response to a wide range of environmental stimuli. Conserved histidine and glycine regions of histidine kinase sensor proteins were used to design degenerate oligonucleotide primers for...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1006/mpat.1998.0265
更新日期:1999-04-01 00:00:00
abstract::Rhoptry proteins (ROPs) play a significant role in various stages of Toxoplasma gondii (T. gondii) life cycle, being critical for both invasion and intracellular survival. ROP38 is a key manipulator of host gene expression and has a function in tachyzoite to bradyzoite conversion. In this study, we've employed various...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2020.104488
更新日期:2020-12-01 00:00:00
abstract::The prominent and phenotypically variable immunogenic protein of Trichomonas vaginalis, termed P270, is present in all isolates. Most, if not all, patients make antibody to the DREGRD epitope contained in the 333 bp tandemly repeating element (TRE). The complete sequence of p270 of a fresh clinical isolate was recentl...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1006/mpat.1999.0281
更新日期:1999-08-01 00:00:00
abstract::The emerging prevalence of multidrug-resistance in Gram-negative pathogens, due to conventional antimicrobial therapeutics, has led the researchers to emphasize on development of alternative novel strategies to suppress the bacterial virulence and pathogenicity through inhibition of quorum sensing (QS) and biofilms. Q...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2018.11.030
更新日期:2019-01-01 00:00:00
abstract::The failure of drugs for effective treatment against infectious diseases can be attributed to resistant forms of causative agents. The evasive nature of Mycobacterium tuberculosis is partly associated to its physical features, such as having a thick cell wall and incorporation of beneficial mutations leading to drug r...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2019.02.003
更新日期:2019-04-01 00:00:00
abstract::Capnocytophaga canimorsus is a part of healthy oral flora of dogs and cats. However, when it is transmitted to human subjects via animal bites or scratches, it can cause severe complications like endocarditis or even lethal septic shock, especially in immunocompromised persons. In this study, we performed the first wh...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2018.10.020
更新日期:2018-12-01 00:00:00
abstract::Catheter associated urinary tract infection (CAUTI) is a highly prevalent hospital-acquired infection that is predominantly caused by uropathogenic Escherichia coli (UPEC). It adheres on catheter surface using type I pili as the initial step of pathogenesis that progresses to form biofilm. In this study, potential inh...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2019.103772
更新日期:2020-01-01 00:00:00
abstract::Edwardsiella piscicida is a Gram-negative pathogen that causes disease in diverse aquatic organisms. The disease leads to extensive losses in commercial aquaculture species, including farmed U.S. catfish. The type III secretion system (T3SS) often contributes to virulence of Gram-negative bacteria. The E. piscicida es...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2020.104108
更新日期:2020-06-01 00:00:00
abstract:BACKGROUND:Malaria is a public health concern that leads to about a million deaths worldwide every year. Malaria is caused by the genus Plasmodium, which includes P. falciparum, P. vivax, P. malariae, and P. ovale. Molecular phylogeny is essential to better recognition the evolution of the genus Plasmodium genus and de...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2019.103782
更新日期:2019-12-01 00:00:00
abstract::Vibrio cholerae elaborates zonula occludens toxin (Zot), a protein that increases the permeability of small intestinal mucosa by opening intercellular tight junctions. The zot gene is located, together with the genes encoding CT and Ace enterotoxins, within the genome of V. cholerae filamentous phage CTXsmall ef, Cyri...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1006/mpat.1999.0312
更新日期:1999-12-01 00:00:00
abstract::Many pathogens of the Pasteurellaceae and Neisseriaceae possess a surface receptor that binds transferrin (Tf) as an initial step in an iron acquisition process. This receptor is comprised of two proteins, transferrin binding protein A (TbpA) and transferrin binding protein B (TbpB). Since the ability to recognize the...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1006/mpat.1998.0226
更新日期:1998-10-01 00:00:00
abstract::The mechanism of Cronobacter pathogenesis in neonatal meningitis and potential virulence factors (aside from host cell invasion ability) remain largely unknown. To ascertain whether Cronobacter can invade and transcytose across intestinal epithelial cells, enter into the blood stream and then transcytose across the bl...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/j.micpath.2011.10.003
更新日期:2012-02-01 00:00:00
abstract::Chlamydia pneumoniae is associated with several chronic human diseases, including chronic obstructive pulmonary disease and atherosclerotic cardiovascular disease. During chronic disease, organisms are believed to exist in a persistent phase that is not well understood at the genetic level. Long-term in vitro continuo...
journal_title:Microbial pathogenesis
pub_type: 杂志文章
doi:10.1016/s0882-4010(02)00187-0
更新日期:2003-01-01 00:00:00