Reference - Detail
| RRC ID | 56362 |
|---|---|
| Author | Matsuda S, Okada R, Tandhavanant S, Hiyoshi H, Gotoh K, Iida T, Kodama T. |
| Title | Export of a Vibrio parahaemolyticus toxin by the Sec and type III secretion machineries in tandem. |
| Journal | Nat Microbiol |
| Abstract |
Many Gram-negative pathogens utilize dedicated secretion systems to export virulence factors such as exotoxins and effectors1-4. Several exotoxins are synthesized as precursors containing amino-terminal Sec signal peptides and are exported through the inner-membrane-bound Sec machinery to the periplasm, followed by secretion across the outer membrane to the exterior using a type II secretion system (T2SS)3,5. Here, we report that thermostable direct haemolysin (TDH), an exotoxin of the food-borne pathogen Vibrio parahaemolyticus, can be exported through the type III secretion system (T3SS), which engages in one-step secretion of effectors4, despite possessing a Sec signal peptide and being mainly secreted via the T2SS. Although the precursor of TDH is targeted to the Sec pathway, a fraction of mature TDH was observed to re-enter the bacterial cytoplasm. The N terminus of mature TDH comprises a T3SS signal sequence, allowing it to be loaded into the T3SS. We also show that T3SS-delivered TDH as an effector contributes to intestinal fluid accumulation in a rabbit diarrhoeal model of V. parahaemolyticus infection. Thus, our results show that an unconventional export mechanism for a bacterial toxin via the T3SS in tandem with the Sec machinery facilitates the virulence trait of V. parahaemolyticus. |
| Volume | 4(5) |
| Pages | 781-788 |
| Published | 2019-5-1 |
| DOI | 10.1038/s41564-019-0368-y |
| PII | 10.1038/s41564-019-0368-y |
| PMID | 30778145 |
| MeSH | Animals Bacterial Proteins / genetics Bacterial Proteins / metabolism* Bacterial Toxins / metabolism Biological Transport Female Hemolysin Proteins / metabolism* Humans Mice, Inbred C3H Rabbits Type III Secretion Systems / genetics Type III Secretion Systems / metabolism* Vibrio Infections / microbiology* Vibrio parahaemolyticus / genetics Vibrio parahaemolyticus / metabolism* |
| IF | 14.633 |
| Times Cited | 7 |
| Altmetric score |
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| The most frequently cited source | X(Twitter) |
| Total number of mentions | 41 |
| Altmetric score changes over past 6months | 0.0 |
| Resource | |
| Pathogenic bacteria | |