Open AccessAcuC, a histone deacetylase, contributes to the pathogenicity of Aeromonas hydrophila
Author(s) -
Jiang Qingling,
Chen Wenbo,
Qin Yingxue,
Huang Lixing,
Xu Xiaojin,
Zhao Lingmin,
Yan Qingpi
Publication year - 2017
Publication title -
microbiologyopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.881
H-Index - 36
ISSN - 2045-8827
DOI - 10.1002/mbo3.468
Subject(s) - aeromonas hydrophila , virulence , microbiology and biotechnology , biology , mutant , transposon mutagenesis , mutagenesis , transposable element , plasmid , genetics , gene , bacteria
The interactions of pathogens and phagocytes are complex. Our study demonstrated that Aeromonas hydrophila B11 can survive in the macrophagocytes of Tilapia mossambica . To explore the regulatory processes of A. hydrophila survival in the macrophagocytes, we used the mini‐ Tn10 transposon mutagenesis system to build a mutant library by mixing Escherichia coli Sm10 ( pLOFK m) and A. hydrophila B11. In total, 102 mutant colonies were detected, and 11 of them showed reduced survival in macrophagocytes. The mutant with the most severe phenotype, AM 73, was chosen for further research. The ORF interrupted by mini‐ Tn10 in AM 73 was approximately 960 bp and was deposited in GenBank with the accession number SRP 049226. The 319 amino acid protein encoded by the ORF showed a high degree of identity (89%) with proteins in the histone deacetylase/AcuC/AphA family of A. hydrophila subsp. hydrophila ATCC 7966. A strain ( AC 73) in which the acuC mutation was complemented was constructed by generating the recombinant expression plasmid pACYC 184‐ acuC and introducing it into the AM 73 mutant strain. Our experiments revealed that strain AM 73 was deficient in biofilm formation, adhesion, survival in macrophagocytes, and virulence compared with A. hydrophila B11, and all of these biological properties were improved in strain AC 73. The expression of 10 significant virulence genes was significantly inhibited in strain AM 73. The results indicated that AcuC was an important regulatory protein contributing to the pathogenicity of A. hydrophila .