Results 21 to 30 of about 28,237 (223)

AmpR ofStenotrophomonas maltophiliais involved in stenobactin synthesis and enhanced β-lactam resistance in an iron-depleted condition [PDF]

Journal of Antimicrobial Chemotherapy, 2020
AbstractBackgroundIron is an essential nutrient for almost all aerobic organisms, including Stenotrophomonas maltophilia. Fur is the only known transcriptional regulator presumptively involved in iron homeostasis in S. maltophilia. AmpR, a LysR-type transcriptional regulator, is known to regulate β-lactamase expression and β-lactam resistance in S ...
Chun‐Hsing Liao, Wei-Chien Chen, Li-Hua Li, Yi-Tsung Lin, Sz-Yun Pan, Tsuey‐Ching Yang   +5 more
openalex   +3 more sources

Introducing AMPR technique for zero crossing bandwidth expansion in outphasing PA [PDF]

AIP Conference Proceedings
Outphasing systems utilize radio-frequency high-efficiency Power Amplifiers (PAs). Here we analyze impairment distortion as result of Signal Component Separator (SCS) that accounts for most of the nonlinearities in outphasing systems. Phase modulation is the general canonical form for the SCS process, which generates two constant envelope outphased ...
Somayeh Mohammady, Pavel Afanasyev
openalex   +3 more sources

Investigation of thePseudomonas aeruginosa ampRgene and its role at the chromosomalampCβ-lactamase promoter [PDF]

FEMS Microbiology Letters, 1993
The complete sequence of the Pseudomonas aeruginosa beta-lactamase regulator gene ampR has been determined. The amino acid sequence encoded by this gene is compared with other members of the LysR family of transcription factors. The P. aeruginosa ampC promoter was subcloned and gel mobility shift assays were used to demonstrate specific binding of AmpR
Julia Lodge, Stephen Busby, Laura J. V. Piddock   +2 more
openalex   +3 more sources

Cloning, Sequence Analyses, Expression, and Distribution of ampC-ampR from Morganella morganii Clinical Isolates [PDF]

Antimicrobial Agents and Chemotherapy, 1999
ABSTRACT Shotgun cloning experiments with restriction enzyme-digested genomic DNA from Morganella morganii 1, which expresses high levels of cephalosporinase, into the pBKCMV cloning vector gave a recombinant plasmid, pPON-1, which encoded four entire genes: ampC , ampR
Laurent Poirel, M Guibert, Delphine Girlich, Thierry Naas, Patrice Nordmann   +4 more
openalex   +3 more sources

In Vivo Development of Aztreonam Resistance in Meropenem-Resistant Pseudomonas aeruginosa Owing to Overexpression of the blaPDC-16

Microbiology Spectrum, 2023
The rapid acquisition of antibiotic resistance of Pseudomonas aeruginosa has been a complex problem in clinics. Two meropenem-resistant P. aeruginosa isolates were collected from the same patient on May 24, 2021, and June 4, 2021, respectively. The first
Li Ding, Yue Sun, Yizhuo Zhang, Siquan Shen, Fupin Hu   +4 more
doaj   +1 more source

Romo1-Derived Antimicrobial Peptide Is a New Antimicrobial Agent against Multidrug-Resistant Bacteria in a Murine Model of Sepsis

mBio, 2020
To overcome increasing bacterial resistance to conventional antibiotics, many antimicrobial peptides (AMPs) derived from host defense proteins have been developed.
Hye-Ra Lee, Deok-gyun You, Hong Kyu Kim, Jang Wook Sohn, Min Ja Kim, Jong Kuk Park, Gi Young Lee, Young Do Yoo   +7 more
doaj   +1 more source

CFE-1, a Novel Plasmid-Encoded AmpC β-Lactamase with anampRGene Originating fromCitrobacter freundii [PDF]

Antimicrobial Agents and Chemotherapy, 2004
ABSTRACTA clinical isolate ofEscherichia colifrom a patient in Japan, isolate KU6400, was found to produce a plasmid-encoded β-lactamase that conferred resistance to extended-spectrum cephalosporins and cephamycins. Resistance arising from production of a β-lactamase could be transferred by either conjugation or transformation with plasmid pKU601 intoE.
Ryuichi Nakano, Ryoichi Okamoto, Yumiko Nakano, Kenichi Kaneko, Naohiro Okitsu, Yoshio Hosaka, Matsuhisa Inoue   +6 more
openalex   +3 more sources

Enhanced deoxyviolacein bioproduction via enzyme condensation with a yeast glycolytic enzyme-derived peptide tag. [PDF]

Biotechnol Prog
Fusion of a 27‐amino‐acid peptide tag derived from a glycolytic enzyme enabled artificial assembly formation of the two violacein biosynthetic enzymes, VioE and VioC. This assembly resulted in enhanced biosynthesis of deoxyviolacein. Abstract In microbial production, regulating endogenous and exogenous synthetic pathways is essential.
Ito R, Ito-Harashima S, Segawa N, Miura N, Kataoka M.   +4 more
europepmc   +2 more sources

ampR Gene Mutations That Greatly Increase Class C β-Lactamase Activity in Enterobacter cloacae [PDF]

Antimicrobial Agents and Chemotherapy, 2000
ABSTRACT The ampC and ampR genes of Enterobacter cloacae GN7471 were cloned into pMW218 to yield pKU403. Four mutant plasmids derived from pKU403 (pKU404, pKU405, pKU406, and pKU407) were isolated in an AmpD mutant of Escherichia coli ...
Akio Kuga, Ryoichi Okamoto, Matsuhisa Inoue   +2 more
openalex   +4 more sources

High-Resolution Genotyping Unveils Identical Ampicillin-Resistant Enterococcus faecium Strains in Different Sources and Countries: A One Health Approach

Microorganisms, 2022
Multidrug-resistant (MDR) Enterococcus faecium (Efm) infections continue to increase worldwide, although epidemiological studies remain scarce in lower middle-income countries. We aimed to explore which strains circulate in E.
Ana R. Freitas, Ana P. Tedim, Ana C. Almeida-Santos, Bárbara Duarte, Houyem Elghaieb, Mohamed S. Abbassi, Abdennaceur Hassen, Carla Novais, Luísa Peixe   +8 more
doaj   +1 more source