The different roles of hcp1 and hcp2 of the type VI secretion system in Escherichia coli strain CE129. (3rd September 2018)

• Record Type: Journal Article
• Authors: Ding, Xueyan; Zhang, Qi; Wang, Heng; Quan, Guomei; Zhang, Dong; Ren, Wenkai; Liao, Yuexia; Xia, Pengpeng; Zhu, Guoqiang
• Is Part Of: Journal of basic microbiology. Volume 58:issue 11(2018)
• Page Start: 938
• Page End: 946
• Publication Date: 2018-09-03
• Subjects: avian pathogenic Escherichia coli (APEC) -- hemolysin co‐regulation proteins (HCP) -- type VI secretion system (T6SS) -- virulence; Microbiology -- Periodicals; 579
• DOI: 10.1002/jobm.201800156
• Languages: English
• ISSNs: 0233-111X

Abstract

Abstract : Type VI secretion system (T6SS) is a secretory system found in Gram‐negative bacteria. One of the main structures for T6SS is Hcp (hemolysin co‐regulation protein) pipeline. To investigate the role of Hcp major sub‐unit genes hcp1 and hcp2, we deleted hcp1 and hcp2 genes for constructing the in‐frame gene deletion mutants. The properties of biofilm formation and the adhesion to chicken embryo fibroblasts cells (DF1 cells) were reduced in the hcp2 mutant. The knockout of hcp1 and hcp 2 genes reduced the ability of the avian pathogenic Escherichia coli (APEC) strain CE129 to infect developing chicken embryos. The expression of quorum sensing (QS)‐associated genes luxS, lsrR, and pfs were down‐regulated in the hcp1 mutant, and the expression of type 1 fimbriae gene fimA and the adhesion‐related genes fimC and papC were decreased in the hcp2 mutant, as well as the expression of anti‐serum survival factor genes ompA and iss were inhibited in both hcp1 and hcp2 mutants. These results described above from this study help to further elaborate the role of HCP in APEC.