CLC number: S858.94; Q78
On-line Access: 2020-03-02
Received: 2019-06-22
Revision Accepted: 2019-09-25
Crosschecked: 2019-12-25
Cited: 0
Clicked: 3273
Wei Yang, Wu-You Wang, Wei Zhao, Jian-Guo Cheng, Yin Wang, Xue-Ping Yao, Ze-Xiao Yang, Dong Yu, Yan Luo. Preliminary study on the role of novel LysR family gene kp05372 in Klebsiella pneumoniae of forest musk deer[J]. Journal of Zhejiang University Science B, 2020, 21(2): 137-154.
@article{title="Preliminary study on the role of novel LysR family gene kp05372 in Klebsiella pneumoniae of forest musk deer",
author="Wei Yang, Wu-You Wang, Wei Zhao, Jian-Guo Cheng, Yin Wang, Xue-Ping Yao, Ze-Xiao Yang, Dong Yu, Yan Luo",
journal="Journal of Zhejiang University Science B",
volume="21",
number="2",
pages="137-154",
year="2020",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.B1900440"
}
%0 Journal Article
%T Preliminary study on the role of novel LysR family gene kp05372 in Klebsiella pneumoniae of forest musk deer
%A Wei Yang
%A Wu-You Wang
%A Wei Zhao
%A Jian-Guo Cheng
%A Yin Wang
%A Xue-Ping Yao
%A Ze-Xiao Yang
%A Dong Yu
%A Yan Luo
%J Journal of Zhejiang University SCIENCE B
%V 21
%N 2
%P 137-154
%@ 1673-1581
%D 2020
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.B1900440
TY - JOUR
T1 - Preliminary study on the role of novel LysR family gene kp05372 in Klebsiella pneumoniae of forest musk deer
A1 - Wei Yang
A1 - Wu-You Wang
A1 - Wei Zhao
A1 - Jian-Guo Cheng
A1 - Yin Wang
A1 - Xue-Ping Yao
A1 - Ze-Xiao Yang
A1 - Dong Yu
A1 - Yan Luo
J0 - Journal of Zhejiang University Science B
VL - 21
IS - 2
SP - 137
EP - 154
%@ 1673-1581
Y1 - 2020
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.B1900440
Abstract: LysR-type transcriptional regulators are involved in the regulation of numerous cellular metabolic processes in Klebsiella pneumoniae, leading to severe infection. Earlier, we found a novel LysR family gene, named kp05372, in a strain of K. pneumoniae (designated GPKP) isolated from forest musk deer. To study the function of this gene in relation to the biological characteristics of GPKP, we used the suicide plasmid and conjugative transfer methods to construct deletion mutant strain GPKP-Δkp05372; moreover, we also constructed the GPKP-Δkp05372+ complemented strain. The role of this gene was determined by comparing the following characteristics of three strains: growth curves, biofilm formation, drug resistance, stress resistance, median lethal dose (LD50), organ colonization ability, and the histopathology of GPKP. Real-time polymerase chain reaction (RT-PCR) was used to test the expression level of seven genes upstream of kp05372. There was no significant difference in the growth rates when comparing the three bacterial strains, and no significant difference was recorded at different osmotic pressures, temperatures, salt contents, or hydrogen peroxide concentrations. The GPKP-Δkp05372 mutant formed a weak biofilm, and the other two strains formed medium biofilm. The drug resistance of the GPKP-Δkp05372 mutant toward cephalothin, cotrimoxazole, and polymyxin B was changed. The acid tolerance of the deletion strain was stronger than that of the other two strains. The LD50 values of the wild-type and complemented strains were 174-fold and 77-fold higher than that of the GPKP-Δkp05372 mutant, respectively. The colonization ability of the GPKP-Δkp05372 mutant in the heart, liver, spleen, kidney, and intestine was the weakest. The three strains caused different histopathological changes in the liver and lungs. In the GPKP-Δkp05372 mutant, the relative expression levels of kp05374 and kp05379 were increased to 1.32-fold and 1.42-fold, respectively, while the level of kp05378 was decreased by 42%. Overall, the deletion of kp05372 gene leads to changes in the following: drug resistance and acid tolerance; decreases in virulence, biofilm formation, and colonization ability of GPKP; and regulation of the upstream region of adjacent genes.
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