Physiological Functions of <i>SecD</i> in <i>Aeromonas hydrophila</i>

FU Yuying; ZHANG Lishan; SRINWASAN Ramanathan; LI Wanxin

doi:10.19303/j.issn.1008-0384.2023.05.011

Volume 38 Issue 5

May 2023

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FU Y Y, ZHANG L S, SRINWASAN R, et al. Physiological Functions of SecD in Aeromonas hydrophila [J]. Fujian Journal of Agricultural Sciences，2023，38（5）：598−606 doi: 10.19303/j.issn.1008-0384.2023.05.011

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FU Y Y, ZHANG L S, SRINWASAN R, et al. Physiological Functions of SecD in Aeromonas hydrophila [J]. Fujian Journal of Agricultural Sciences，2023，38（5）：598−606 doi: 10.19303/j.issn.1008-0384.2023.05.011

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Physiological Functions of SecD in Aeromonas hydrophila

doi: 10.19303/j.issn.1008-0384.2023.05.011

FU Yuying^1
,,
ZHANG Lishan^{2, 3},
SRINWASAN Ramanathan^{2, 3},
LI Wanxin^{4
,
,}

1.
School of Safety and Environment, Fujian Chuanzheng Communications College, Fuzhou, Fujian　350007, China
2.
School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, Fujian　350002, China
3.
Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring, Fuzhou, Fujian　350002, China
4.
School of Public Health, Fujian Medical University, Fuzhou, Fujian　350122, China

Received Date: 2022-09-26
Rev Recd Date: 2023-03-09

Available Online: 2023-04-14

Publish Date: 2023-05-28

Abstract

Abstract

Objective Physiological functions of the Sec pathway subunit secD of Aeromonas hydrophila were studied. Method An secD-knockout A.hydrophila was constructed by homologous recombination with pRE112 suicide vector. Effects of the genetic deletion on the physiological phenotypes including hemolytic and extracellular protease activities were determined on sheep’s blood and skim milk agar plates; on the biofilm formation, by crystal violet staining combined with SpectraMax® i3; on the bacterial acid-base and hyperosmolarity tolerance, according to the growth curve; and on the minimal inhibitory concentration (MIC) of antibiotics, using the broth microdilution method. Result Compared to wild-type, the constructed ∆secD A.hydrophila showed no significant differences in growth and tolerance to pH 5, 6, 7, and 8. The activities of hemolytic and extracellular protease, as well as the resistance to high osmotic pressure or pH 9 were enhanced. The biofilm forming ability significantly declined. And the resistance to antibiotics varied, as the MIC increased 4 times on oxytetracycline, tetracycline, enoxacin, or meropenem and two times on ciprofloxacin and norfloxacin, but decreased 2 times on erythromycin and 4 times on cefotaxime. Conclusion The Sec pathway subunit secD was confirmed to be involved in the transport of virulence factors and resistance to antibiotics in A.hydrophila. It could be a key element in studies for developing antimicrobial applications and prevention of disease infected by the pathogen.
- Aeromonas hydrophila,
- secD,
- Sec pathway,
- physiological functions

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References(27)

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