國家衛生研究院 NHRI:Item 3990099045/13740
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/13740


    Title: RamAp is an efflux pump regulator carried by an IncHI2 plasmid
    Authors: Hong, YP;Wang, YW;Chen, BH;Song, HY;Chiou, CS;Chen, YT
    Contributors: Institute of Molecular and Genomic Medicine
    Abstract: In investigating the epidemiological trends of Salmonella enterica serovar Goldcoast, we have previously identified several closely related strains with different MICs to azithromycin and quinolones. Genome sequencing and comparison of two very similar MDR strains, R18.0877 and R18.1656, has led to the identification of an extra plasmid-borne ramA gene, ramAp, on the large IncHI2 plasmid carried by R18.0877. The ramAp is located in a 953-bp region on the plasmid, which is identical to that of the Klebsiella quasipneumoniae chromosomal ramA loci. A truncated ISEcp1 located at the adjacent upstream of the putative regulatory region of the ramAp may likely contribute to its mobilization and expression. Introducing the ramAp and the truncated ISEcp1 into E. coli have resulted in elevated expression of efflux pump genes and elevated MICs to chloramphenicol, azithromycin, nalidixic acid, ciprofloxacin, sulfamethoxazole, trimethoprim, tetracycline, and tigecycline. The ramAp is an extra efflux pump activator gene that potentially could be transmitted with the IncHI2 plasmid among bacteria. It is plausible that, with high interspecific conservation, the plasmid-encoded regulator reduces drug susceptibility by activating existing efflux pump systems of the host and thus can be regarded as a new type of auxiliary antimicrobial resistance determinant. Sequences of similar plasmids were found worldwide. Its impact on the emergence of antimicrobial resistance among bacterial pathogens is worrisome.
    Date: 2022-01
    Relation: Antimicrobial Agents and Chemotherapy. 2022 Jan 18;66(1):Article number e01152-21.
    Link to: http://dx.doi.org/10.1128/aac.01152-21
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0066-4804&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000747519500011
    Cited Times(Scopus): https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85123088433
    Appears in Collections:[Others] Periodical Articles

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