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Authors: Qu, Daofeng and Shen, Yang and Hu, Lingfei and Jiang, Xiaoyuan and Yin, Zhe and Gao, Bo and Zhao, Yuee and Yang, Wenhui and Yang, Huiying and Han, Jianzhong and Zhou, Dongsheng

IncR, IncFII, IncpA1763-KPC, and IncN1 plasmids have been increasingly found among Enterobacteriaceae species, but plasmids with hybrid structures derived from the above-mentioned incompatibility groups have not yet been described.Plasmids p721005-KPC, p504051-KPC, and pA3295-KPC were fully sequenced and compared with previously sequenced related plasmids pHN84KPC (IncR), pKPHS2 (IncFIIK), pKOX_NDM1 (IncFIIY), pHN7A8 (IncFIIpHN7A8), and R46 (IncN1).The backbone of p721005-KPC/p504051-KPC was a hybrid of the entire 10-kb IncR-type backbone from pHN84KPC, the entire 64.3-kb IncFIIK-type maintenance, and conjugal transfer regions from pKPHS2, a 15.5-kb IncFIIY-type maintenance region from pKOX_NDM1 and a 5.6-kb IncpA1763-KPC-type backbone region from pA1763-KPC, and it contained a primary IncR replicon and two auxiliary IncpA1763-KPC and IncN1 replicons. The backbone of pA3295-KPC was a hybrid of a 7.2-kb IncFIIpHN7A8-type backbone region from pHN7A8, the almost entire 33.3-kb IncN1-type maintenance and conjugal transfer regions highly similar to R46, a 26.2-kb IncFIIK-type maintenance regions from pKPHS2, the above 15.5-kb IncFIIY-type maintenance region, and the above 5.6-kb IncpA1763-KPC-type backbone region, and it contained a primary Inc-FIIpHN7A8 replicon and two auxiliary IncpA1763-KPC and IncN1 replicons. Each of p721005-KPC, p504051-KPC, and pA3295-KPC acquired a wealth of accessory modules, carrying a range of intact and residue mobile elements (such as insertion sequences, unit transposons, and integrons) and resistance markers (such as blaKPC, tetA, dfrA, and qnr).In each of p721005-KPC, p504051-KPC, and pA3295-KPC, multiple replicons in coordination with maintenance and conjugation regions of various origins would maintain a broad host range and a stable replication at a steady-state plasmid copy number.

Journal: Infection and drug resistance
DOI: 10.2147/IDR.S189168
Year: 2019

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