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- W2600197774 abstract "<b><i>Aims:</i></b> This work investigated the relative strengths of different <i>bla</i><sub>SHV</sub> promoter-associated sequences and their regulation function in <i>bla</i><sub>SHV</sub> expression and β-lactam resistance. <b><i>Methods:</i></b> Recombinant plasmids with the promoter-associated sequences (P-W, P-S, P-IS, and P-WPD), <i>tac</i> promoter, and combined fragments of promoter and <i>bla</i><sub>SHV</sub> were separately constructed and transformed into <i>Escherichia coli</i> DH5α. The relative strengths of the promoters indicated by the intensities of green fluorescent protein and the mRNA expression levels of <i>bla</i><sub>SHV</sub> were compared. The minimum inhibitory concentration and extended spectrum β-lactamase phenotypes were evaluated. <b><i>Results:</i></b> The relative strengths were ranked as P-<i>tac</i> > P-WPD > P-IS > P-S > P-W. The mRNA expression and β-lactam resistance levels of the different promoter-associated sequence groups were generally consistent with the strength rank, but the extent of <i>gfp</i> and <i>bla</i><sub>SHV</sub> mRNA levels varied significantly in each group. The β-lactam resistance levels were inconsistent with the strength rank in certain <i>bla</i><sub>SHV</sub> groups. In relation to the different promoter-associated sequences,<i> bla</i><sub>SHV-ESBLs</sub> displayed significantly different change modes of β-lactam resistance compared with <i>bla</i><sub>SHV-non-ESBLs</sub>. <b><i>Conclusion:</i></b> The mRNA expression and β-lactam resistance of the <i>bla</i><sub>SHV</sub> showed consistencies and inconsistencies with the strengths of the promoter-associated sequences. The mechanisms accounting for these discrepancies need further investigation." @default.
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- W2600197774 date "2017-01-01" @default.
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- W2600197774 title "Relative Strengths and Regulation of Different Promoter-Associated Sequences for Various <b><i>bla</i></b><sub>SHV</sub> Genes and Their Relationships to β-Lactam Resistance" @default.
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- W2600197774 doi "https://doi.org/10.1159/000458708" @default.
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