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• W1918230834 endingPage "2593" @default.
• W1918230834 startingPage "2584" @default.
• W1918230834 abstract "Using a newly constructed Bacteroides fragilis-Escherichia coli cloning shuttle vector, pJST61, we have cloned the cefoxitin (FOX)-imipenem (IMP) resistance determinant from B. fragilis TAL2480. FOX-IMP resistance in this strain results from the production of a periplasmic, Zn2(+)-containing beta-lactamase which hydrolyzes carbapenems and cephamycins and whose activity is resistant to clavulanic acid but sensitive to Zn2(+)-binding reagents, including EDTA. The pJST61 vector permits efficient library construction in E. coli and allows for the transfer of the library to B. fragilis recipients for the screening or selection of specific phenotypes. The library clone containing the FOX-IMP resistance gene was detected after transfer to B. fragilis TM4000 (Fox-Imps) selecting for Foxr. One of the isolates carrying plasmid pJST241 is resistant to FOX and IMP and synthesizes a periplasmic protein with substrate and inhibitor properties identical to those of strain TAL2480. On the basis of deletion analysis, Tn1000 insertion mutations, and DNA sequencing, we have defined the 747-base cfiA (FOX-IMP resistance) gene within the 3.6-kilobase cloned insert in pJST241. The cfiA gene contains an open reading frame that could code for a precursor protein of 249 amino acids and with a molecular mass of 27,260 daltons. A potential signal sequence has been identified at the N terminus of this protein; cleavage within this sequence would result in a protein of 231 amino acids with a molecular mass of 25,249 daltons. The CfiA protein shows remarkable similarities to the exported, Zn2(+)-requiring, type II beta-lactamase Blm proteins from Bacillus cereus 569/H and 5/B/6. Although overall amino acid identity is only 32%, the Zn ligand-binding His and Cys residues are precisely conserved and the amino acids in the vicinity of these sites show strong similarities (greater than 80%) when the CfiA and Blm proteins are compared." @default.
• W1918230834 created "2016-06-24" @default.
• W1918230834 creator A5060553768 @default.
• W1918230834 creator A5069753242 @default.
• W1918230834 date "1990-05-01" @default.
• W1918230834 modified "2023-09-27" @default.
• W1918230834 title "Sequencing the gene for an imipenem-cefoxitin-hydrolyzing enzyme (CfiA) from Bacteroides fragilis TAL2480 reveals strong similarity between CfiA and Bacillus cereus beta-lactamase II" @default.
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• W1918230834 doi "https://doi.org/10.1128/jb.172.5.2584-2593.1990" @default.
• W1918230834 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/208901" @default.
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