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Plos One : a Truncated Ades Kinase Protein Generated by is Aba1 Insertion Correlates with Tigecycline Resistance in Acinetobacter Baumannii, Volume 7

By Webber, Mark, Alexander

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Book Id: WPLBN0003933213
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos One : a Truncated Ades Kinase Protein Generated by is Aba1 Insertion Correlates with Tigecycline Resistance in Acinetobacter Baumannii, Volume 7  
Author: Webber, Mark, Alexander
Volume: Volume 7
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary)
Historic
Publication Date:
Publisher: Plos

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Webber, M. A. (n.d.). Plos One : a Truncated Ades Kinase Protein Generated by is Aba1 Insertion Correlates with Tigecycline Resistance in Acinetobacter Baumannii, Volume 7. Retrieved from http://kindle.worldlibrary.net/


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Description : Over-expression of AdeABC efflux pump stimulated continuously by the mutated AdeRS two component system has been found to result in antimicrobial resistance, even tigecycline (TGC) resistance, in multidrug-resistant Acinetobacter baumannii (MRAB). Although the insertion sequence, ISAba1, contributes to one of the AdeRS mutations, the detail mechanism remains unclear. In the present study we collected 130 TGC-resistant isolates from 317 carbapenem resistant MRAB (MRAB-C) isolates, and 38 of them were characterized with ISAba1 insertion in the adeS gene. The relationship between the expression of AdeABC efflux pump and TGC resistant was verified indirectly by successfully reducing TGC resistance with NMP, an efflux pump inhibitor. Further analysis showed that the remaining gene following the ISAba1 insertion was still transcribed to generate a truncated AdeS protein by the Pout promoter on ISAba1 instead of frame shift or pre-termination. Through introducing a series of recombinant adeRS constructs into a adeRS knockout strain, we demonstrated the truncated AdeS protein was constitutively produced and stimulating the expression of AdeABC efflux pump via interaction with AdeR. Our findings suggest a mechanism of antimicrobial resistance induced by an aberrant cytoplasmic sensor derived from an insertion element.

 

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