Genetic and biochemical characterization of an acquired subgroup B3 metallo-β-lactamase gene, blaAIM-1, and its unique genetic context in Pseudomonas aeruginosa from Australia

DongEun Yong, Mark A. Toleman, Jan Bell, Brett Ritchie, Rachael Pratt, Henry Ryley, Timothy R. Walsh

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Three clinical Pseudomonas aeruginosa isolates (WCH2677, WCH2813, and WCH2837) isolated from the Women's and Children's Hospital, Adelaide, Australia, produced a metallo-β-lactamase (MBL)-positive Etest result. All isolates were PCR negative for known MBL genes. A gene bank was created, and an MBL gene, designated blaAIM-1, was cloned and fully characterized. The encoded enzyme, AIM-1, is a group B3 MBL that has the highest level of identity to THIN-B and L1. It is chromosomal and flanked by two copies (one intact and one truncated) of an ISCR element, ISCR15. Southern hybridization studies indicated the movement of both ISCR15 and blaAIM-1 within the three different clinical isolates. AIM-1 hydrolyzes most β-lactams, with the exception of aztreonam and, to a lesser extent, ceftazidime; however, it possesses significantly higher kcat values for cefepime and carbapenems than most other MBLs. AIM-1 was the first mobile group B3 enzyme detected and signals further problems for already beleaguered antimicrobial regimes to treat serious P. aeruginosa and other Gram-negative infections.

Original languageEnglish
Pages (from-to)6154-6159
Number of pages6
JournalAntimicrobial agents and chemotherapy
Volume56
Issue number12
DOIs
Publication statusPublished - 2012 Dec 1

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Pseudomonas aeruginosa
Molecular Biology
Disk Diffusion Antimicrobial Tests
Genes
Aztreonam
Lactams
Carbapenems
Ceftazidime
Enzymes
Polymerase Chain Reaction
Infection
cefepime

All Science Journal Classification (ASJC) codes

  • Pharmacology
  • Pharmacology (medical)
  • Infectious Diseases

Cite this

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abstract = "Three clinical Pseudomonas aeruginosa isolates (WCH2677, WCH2813, and WCH2837) isolated from the Women's and Children's Hospital, Adelaide, Australia, produced a metallo-β-lactamase (MBL)-positive Etest result. All isolates were PCR negative for known MBL genes. A gene bank was created, and an MBL gene, designated blaAIM-1, was cloned and fully characterized. The encoded enzyme, AIM-1, is a group B3 MBL that has the highest level of identity to THIN-B and L1. It is chromosomal and flanked by two copies (one intact and one truncated) of an ISCR element, ISCR15. Southern hybridization studies indicated the movement of both ISCR15 and blaAIM-1 within the three different clinical isolates. AIM-1 hydrolyzes most β-lactams, with the exception of aztreonam and, to a lesser extent, ceftazidime; however, it possesses significantly higher kcat values for cefepime and carbapenems than most other MBLs. AIM-1 was the first mobile group B3 enzyme detected and signals further problems for already beleaguered antimicrobial regimes to treat serious P. aeruginosa and other Gram-negative infections.",
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Genetic and biochemical characterization of an acquired subgroup B3 metallo-β-lactamase gene, blaAIM-1, and its unique genetic context in Pseudomonas aeruginosa from Australia. / Yong, DongEun; Toleman, Mark A.; Bell, Jan; Ritchie, Brett; Pratt, Rachael; Ryley, Henry; Walsh, Timothy R.

In: Antimicrobial agents and chemotherapy, Vol. 56, No. 12, 01.12.2012, p. 6154-6159.

Research output: Contribution to journalArticle

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