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Comparison of Class 2 Integron Integrase Activities

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Abstract

Integrons play important roles in the dissemination of antimicrobial resistant genes among bacteria. Class 2 integrons usually has an internal stop codon, TAA, in integrase genes (intI2), leading to a truncated integrase, IntI2*. However, a few class 2 integrons with a natural full-length integrase have been reported. In this study, the sequences of natural full-length intI2 were extracted from INTEGRALL database and analyzed. A total of 236 sequences of intI2 were retrieved from INTEGRALL database, only seven of which were natural full-length intI2 genes and could be divided into five types according to their coding amino acid sequence. Quantitative real-time PCR was used to detect gene cassette sat2 integration and excision efficiency catalyzed by different natural full-length IntI2s. The results showed that all five IntI2s could catalyze attI2 × attCsat2 integration and attCdfrA1/sat2 × attCsat2/aadA1 excision in Escherichia coli. Integration and excision frequency catalyzed by IntI2A176 was highest and was about twofold as high as those catalyzed by IntI2S175_A176. The secondary structure of the IntI2 was predicted by online software. Polymorphisms of these five IntI2s were limited within residues 172, 174, 175, 176 and 256, and these residues were all far away from the predicted DNA binding regions or catalyzed sites. Influence of amino acid sequence polymorphisms of these natural full-length IntI2s on their catalyzed activities is limited.

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Adapted from ref. [19] with permission from Blackwell Publishing Ltd)

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant No. 81572034, the Development Fund for Shanghai Talents under Grant No. 2018098, Fengxian District (Society) Science and Technology Development Fund Project under Grant No. 20151001.

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Authors and Affiliations

  1. Department of Laboratory Medicine, Anhui University of Science and Technology Affiliated Fengxian Hospital, 6600 Nanfeng Road, Shanghai, 201499, China

    Xiaotong Wang, Nana Kong, Mei Cao, Long Zhang, Muzhen Sun & Quhao Wei

  2. Department of Laboratory Medicine, Southern Medical University Affiliated Fengxian Hospital, 6600 Nanfeng Road, Shanghai, 201499, China

    Linlin Xiao & Quhao Wei

  3. Department of Laboratory Medicine, Jinshan Hospital, Shanghai Medical College, Fudan University, 1508 Longhang Road, Shanghai, 201508, China

    Gang Li

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  1. Xiaotong Wang
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Contributions

QW and XW conceived the study. GL coordinated the study. XW, NK, MC, LZ and MS performed the experiments. XW and QW analyzed the data and wrote the manuscript. QW and GL revised the manuscript.

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Correspondence to Gang Li or Quhao Wei.

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Wang, X., Kong, N., Cao, M. et al. Comparison of Class 2 Integron Integrase Activities. Curr Microbiol 78, 967–978 (2021). https://doi.org/10.1007/s00284-021-02352-9

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