Four LysR-type transcriptional regulator family proteins (LTTRs) involved in antibiotic resistance in Aeromonas hydrophila

  • Yuying Fu
  • Qilan Cai
  • Yuqian Wang
  • Wanxin Li
  • Jing Yu
  • Guidi Yang
  • Wenxiong LinEmail author
  • Xiangmin LinEmail author
Original Paper


Aeromonas hydrophila is a Gram-negative bacterium that causes serious infections in aquaculture and exhibits significant multidrug resistance. The LysR-type transcriptional regulator (LTTR) family proteins are a well-known group of transcriptional regulators involved in diverse physiological functions. However, the role of LTTRs in the regulation of bacterial resistance to antibiotics is still largely unknown. In this study, to further investigate the role of four putative LTTR family proteins (A0KIU1, A0KJ82, A0KPK0, and A0KQ63) in antibiotic resistance in A. hydrophila, their genes were cloned and overexpressed in engineered Escherichia coli. After the optimization of experimental conditions including incubation time, temperature, and IPTG concentration, these proteins were successfully purified, and their specific antibodies against mice were obtained. Using western blot analysis, we found that these LTTR family proteins were downregulated in A. hydrophila following antibiotic treatment, indicating that they may be involved in the regulation of antibiotic resistance. Additionally, minimum inhibitory concentration (MIC) assays of chloramphenicol (CM), chlortetracycline (CTC), ciprofloxacin (CF), furazolidone (FZ), and balofloxacin (BF) in E. coli showed that overexpression of these LTTRs led to increased sensitivity to several antibiotics. To further validate their functional role in antibiotic resistance, we demonstrated that bacteria with loss of A0KQ63 (ΔAHA_3980) exhibited multi-drug resistance properties. Our results indicate that these LTTR family proteins may play an important role in the antibiotic resistance of A. hydrophila, and the that underlying mechanisms controlling antibiotic resistance should be further investigated.


Aeromonas hydrophila LysR-type transcriptional regulator (LTTR) family protein Antibiotic resistance 



This work was sponsored by grants from NSFC Projects (Nos. 31470238 and 31670129), the Program for Innovative Research Team in Fujian Agricultural and Forestry University (No.712018009), and the Fujian-Taiwan Joint Innovative Center for Germplasm Resources and Cultivation of Crops (FJ 2011 Program, No. 2015–75, China). We also thank Dr. Srinivasan Ramanathan and Accdon ( for providing linguistic assistance during the preparation of this manuscript.


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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, College of Life SciencesFujian Agriculture and Forestry UniversityFuzhouPeople’s Republic of China
  2. 2.Key Laboratory of Crop Ecology and Molecular Physiology (Fujian Agriculture and Forestry University)Fujian Province UniversityFuzhouPeople’s Republic of China
  3. 3.Agroecological InstituteFujian Agriculture and Forestry UniversityFuzhouPeople’s Republic of China

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