Abstract:
:We found that cells of Vibrio parahaemolyticus possess an energy-dependent efflux system for norfloxacin. We cloned a gene for a putative norfloxacin efflux protein from the chromosomal DNA of V. parahaemolyticus by using an Escherichia coli mutant lacking the major multidrug efflux system AcrAB as the host and sequenced the gene (norM). Cells of E. coli transformed with a plasmid carrying the norM gene showed elevated energy-dependent efflux of norfloxacin. The transformants showed elevated resistance not only to norfloxacin and ciprofloxacin but also to the structurally unrelated compounds ethidium, kanamycin, and streptomycin. These results suggest that this is a multidrug efflux system. The hydropathy pattern of the deduced amino acid sequence of NorM suggested the presence of 12 transmembrane domains. The deduced primary structure of NorM showed 57% identity and 88% similarity with that of a hypothetical E. coli membrane protein, YdhE. No reported drug efflux protein in the sequence databases showed significant sequence similarity with NorM. Thus, NorM seems to be a novel type of multidrug efflux protein. We cloned the ydhE gene from E. coli. Cells of E. coli transformed with the cloned ydhE gene showed elevated resistance to norfloxacin, ciprofloxacin, acriflavine, and tetraphenylphosphonium ion, but not to ethidium, when MICs were measured. Thus, it seems that NorM and YdhE differ somehow in substrate specificity.
journal_name
Antimicrob Agents Chemotherjournal_title
Antimicrobial agents and chemotherapyauthors
Morita Y,Kodama K,Shiota S,Mine T,Kataoka A,Mizushima T,Tsuchiya Tdoi
10.1128/AAC.42.7.1778subject
Has Abstractpub_date
1998-07-01 00:00:00pages
1778-82issue
7eissn
0066-4804issn
1098-6596journal_volume
42pub_type
杂志文章abstract::Argyrins are natural products with antibacterial activity against Gram-negative pathogens, such as Pseudomonas aeruginosa, Burkholderia multivorans, and Stenotrophomonas maltophilia We previously showed that argyrin B targets elongation factor G (FusA). Here, we show that argyrin B activity against P. aeruginosa PAO1 ...
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abstract::The pharmacokinetics of zidovudine (ZDV) are established in patients with various stages of human immunodeficiency virus (HIV) disease. This study was conducted to determine the pharmacokinetic parameters of ZDV in patients with asymptomatic HIV infection and liver disease. HIV-infected volunteers with normal renal fu...
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journal_title:Antimicrobial agents and chemotherapy
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doi:10.1128/aac.26.4.599
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abstract::An in vitro tissue culture system consisting of reaggregated embryonic brain cells was used to evaluate the inhibition of herpes simplex type 1 (HSV-1) by several antiviral compounds. The efficacy of acyclovir, vidarabine, bromovinyldeoxyuridine, and 9-(1,3-dihydroxy-2-propoxymethyl) guanine in HSV-1-infected Vero cel...
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更新日期:1986-12-01 00:00:00
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更新日期:1993-10-01 00:00:00
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doi:10.1128/aac.34.12.2429
更新日期:1990-12-01 00:00:00
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更新日期:2001-04-01 00:00:00
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journal_title:Antimicrobial agents and chemotherapy
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更新日期:2014-06-01 00:00:00
abstract::Expression of eight transporter genes of Escherichia coli K-12 and its DeltaacrAB mutant prior to and after induction of both strains to tetracycline resistance and after reversal of induced resistance were analyzed by quantitative reverse transcriptase PCR. All transporter genes were overexpressed after induced resis...
journal_title:Antimicrobial agents and chemotherapy
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更新日期:2005-08-01 00:00:00
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abstract::In order to study the mechanism of insusceptibility of Spiroplasma citri to rifampin, we have cloned and sequenced its rpoB gene, which encodes the beta subunit of RNA polymerase. By comparison of the deduced amino acid sequence with sequences of beta subunits from susceptible and resistant bacteria, it was possible t...
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doi:10.1128/AAC.40.4.858
更新日期:1996-04-01 00:00:00
abstract::Hepatitis C virus (HCV) genotype (GT) 2 represents approximately 9% of all viral infections globally. While treatment outcomes for GT2-infected patients have improved substantially with direct-acting antiviral agents (DAAs) compared to interferon-α, the presence of polymorphisms in NS5A can impact efficacy of NS5A inh...
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doi:10.1128/aac.38.12.2702
更新日期:1994-12-01 00:00:00
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journal_title:Antimicrobial agents and chemotherapy
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更新日期:1983-01-01 00:00:00
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journal_title:Antimicrobial agents and chemotherapy
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更新日期:2004-11-01 00:00:00
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journal_title:Antimicrobial agents and chemotherapy
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更新日期:2004-11-01 00:00:00
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journal_title:Antimicrobial agents and chemotherapy
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journal_title:Antimicrobial agents and chemotherapy
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abstract::Omadacycline is a first-in-class aminomethylcycline antibiotic with microbiological activity against Gram-positive and Gram-negative aerobes and anaerobes and atypical bacteria that is being developed for the treatment of acute bacterial skin and skin structure infections (ABSSSI) and community-acquired bacterial pneu...
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pub_type: 杂志文章,随机对照试验
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更新日期:2016-11-21 00:00:00