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SecA2 Associates with Translating Ribosomes and Contributes to the Secretion of Potent IFN-β Inducing RNAs
oleh: Lisa Teubner, Renate Frantz, Luigi La Pietra, Martina Hudel, Jasmin Bazant, Günter Lochnit, Lena Eismann, Günter Kramer, Trinad Chakraborty, Mobarak Abu Mraheil
Format: | Article |
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Diterbitkan: | MDPI AG 2022-11-01 |
Deskripsi
Protein secretion plays a central role in modulating interactions of the human pathogen <i>Listeria monocytogenes</i> with its environment. Recently, secretion of RNA has emerged as an important strategy used by the pathogen to manipulate the host cell response to its advantage. In general, the Sec-dependent translocation pathway is a major route for protein secretion in <i>L. monocytogenes</i>, but mechanistic insights into the secretion of RNA by these pathways are lacking. Apart from the classical SecA1 secretion pathway, <i>L. monocytogenes</i> also encodes for a SecA paralogue (SecA2) which targets the export of a specific subset of proteins, some of which are involved in virulence. Here, we demonstrated that SecA2 co-sediments with translating ribosomes and provided evidence that it associates with a subset of secreted small non-coding RNAs (sRNAs) that induce high levels of IFN-β response in host cells. We found that enolase, which is translocated by a SecA2-dependent mechanism, binds to several sRNAs, suggesting a pathway by which sRNAs are targeted to the supernatant of <i>L. monocytogenes</i>.