Engagement of heterogeneous nuclear ribonucleoprotein M with listeriolysin O induces type I interferon expression and restricts Listeria monocytogenes growth in host cells.
Listeriolysin O (LLO) is a key virulence factor secreted by the Gram-positive, facultative intracellular pathogen Listeria monocytogenes (LM). Its role in host cell response is still not very clear. Using pull-down assay, mass spectrometry analysis and immunoprecipitation approaches, we found that LLO interacted with heterogeneous nuclear ribonucleoprotein M (hnRNPM), a member of RNA splicing complex apparatus, and the binding domain of LLO for hnRNP M was located between amino acids 26 and 176. Knockdown of hnRNP M inhibited LLO-induced activation of IFN-α, IFN-β and AP-1 promoters and enhanced LM growth in host cells. Thus, engagement of hnRNP M with LLO induces type I interferon expression and restricts LM growth in host cells, suggesting a critical role of hnRNP M in LLO-induced immune responses in host cells. These findings will contribute to further understandings of the molecular mechanisms underlying the host defense against LM infection.
State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, China.
Zheng
Z
Luo
Zhonghua
Z
Li
Kun
K
Chen
Ruochen
R
Liu
Xiaoqi
X
Li
Hong
H
Cao
Shijun J
SJ
Zheng
D000818:Animals; D001427:Bacterial Toxins / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D002460:Cell Line; D005786:Gene Expression Regulation; D006360:Heat-Shock Proteins / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D006460:Hemolysin Proteins / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D006461:Hemolysis / Q000276:immunology; D034761:Heterogeneous-Nuclear Ribonucleoprotein Group M / Q000235:genetics / Q000378:metabolism*; D054884:Host-Pathogen Interactions / Q000276:immunology; D006801:Humans; D007370:Interferon Type I / Q000235:genetics* / Q000378:metabolism; D008089:Listeria monocytogenes / Q000235:genetics / Q000254:growth & development / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D021381:Protein Transport; D034622:RNA Interference; D011994:Recombinant Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism
D001427:Bacterial Toxins; D006360:Heat-Shock Proteins; D006460:Hemolysin Proteins; D034761:Heterogeneous-Nuclear Ribonucleoprotein Group M; D007370:Interferon Type I; D011994:Recombinant Proteins; C038705:hlyA protein, Listeria monocytogenes