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Authors: Kubota, Hiroaki and Uwamino, Yoshifumi and Matsui, Mari and Sekizuka, Tsuyoshi and Suzuki, Yasunori and Okuno, Rumi and Uchitani, Yumi and Ariyoshi, Tsukasa and Aoki, Wataru and Suzuki, Satowa and Kuroda, Makoto and Shinkai, Takayuki and Yokoyama, Keiko and Sadamasu, Kenji and Funakoshi, Takeru and Murata, Mitsuru and Hasegawa, Naoki and Iwata, Satoshi

A carbapenem-resistant Enterobacter cloacae complex isolated in Tokyo, Japan, produced a carbapenemase that was detected by a Carba NP test and a modified carbapenem inactivation method, but none of the 'Big Five' carbapenemase genes was detected by PCR. This study aimed to identify the carbapenemase.Carbapenemase genes were screened by WGS. Next, we generated a recombinant plasmid in which the carbapenemase gene was inserted. We also extracted the carbapenemase gene-carrying plasmid from the E. cloacae complex. The effects of both plasmids on the antibiotic susceptibility of Escherichia coli were then tested. The carbapenemase gene-carrying plasmid in the E. cloacae complex was completely sequenced.A novel carbapenemase gene, blaFRI-4, encoded an amino acid sequence that was 93.2% identical to French imipenemase (FRI-1). E. coli transformed with blaFRI-4 showed reduced carbapenem susceptibility. A complete sequence of the blaFRI-4-carrying 98?508?bp IncFII/IncR plasmid (pTMTA61661) showed that blaFRI-4 and the surrounding region (18.7?kb) were duplicated.The FRI-4-producing E. cloacae complex was isolated in Japan, whereas all other FRI variants have been found in Europe, suggesting that the spread of FRI carbapenemases is global.

Journal: The Journal of antimicrobial chemotherapy
DOI: 10.1093/jac/dky291
Year: 2018

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