Cephalosporinase over-expression resulting from insertion of ISAba1 in Acinetobacter baumannii
نویسندگان
چکیده
منابع مشابه
Extended-spectrum cephalosporinase in Acinetobacter baumannii.
An AmpC-type beta-lactamase conferring high-level resistance to expanded-spectrum cephalosporins and monobactams was characterized from an Acinetobacter baumannii clinical isolate. This class C beta-lactamase (named ADC-33) possessed a Pro210Arg substitution together with a duplication of an Ala residue at position 215 (inside the Omega-loop) compared to a reference AmpC cephalosporinase from A...
متن کاملFunctional analysis of insertion sequence ISAba1, responsible for genomic plasticity of Acinetobacter baumannii.
ISAba1 is an insertion sequence that is widely distributed in Acinetobacter baumannii. We demonstrated here that ISAba1 and the composite transposon Tn2006 are capable of transposition, generating 9-bp target site duplications. The expression of the ISAba1 transposase-encoding gene was downregulated by translational frameshifting.
متن کاملA Truncated AdeS Kinase Protein Generated by ISAba1 Insertion Correlates with Tigecycline Resistance in Acinetobacter baumannii
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 col...
متن کاملAmpC cephalosporinase hyperproduction in Acinetobacter baumannii clinical strains.
OBJECTIVE To compare the genetic environments of ampC genes in different Acinetobacter baumannii isolates showing different levels of beta-lactam resistance. METHODS The patterns of beta-lactam resistance and beta-lactamase production were investigated for 42 A. baumannii clinical strains. The MICs of various beta-lactams were determined in the presence or absence of the class C cephalosporin...
متن کاملOccurrence of OXA-107 and ISAba1 in carbapenem-resistant isolates of Acinetobacter baumannii from Croatia.
Carbapenem-resistant isolates of Acinetobacter baumannii from intensive care units at Split University Hospital, Split, Croatia, were studied. Most (100 of 106) had ISAba1 inserted upstream of a bla(OXA-107) gene, encoding an unusual OXA-51-type oxacillinase. Pulsed-field gel electrophoresis revealed that the isolates formed three clusters belonging to the sequence group 2 (European clone 1) li...
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ژورنال
عنوان ژورنال: Clinical Microbiology and Infection
سال: 2006
ISSN: 1198-743X
DOI: 10.1111/j.1469-0691.2005.01320.x