Plesiomonas shigelloides exports a lethal cytotoxic-enterotoxin (LCE) by membrane vesicles
Braz. j. infect. dis
;
20(6): 546-555, Nov.-Dec. 2016. tab, graf
Article
Dans Anglais
| LILACS
| ID: biblio-828157
ABSTRACT
ABSTRACT Plesiomonas shigelloides isolated from water in Brazil was previously described as a hemorrhagic heat-labile cytotoxic-enterotoxin producer. We purified this toxin from culture supernatants using ion metallic affinity chromatography (IMAC) followed by molecular exclusion chromatography. The pure toxin presented molecular mass of 50 kDa and isoelectric point (pI) around 6.9 by 2D electrophoresis. When injected intravenously, the purified cytotoxic-enterotoxin induced also severe spasms followed by sudden death of mice. Hence, we entitled it as lethal cytotoxic-enterotoxin (LCE). The presence of membrane vesicles (MVs) on cell surfaces of P. shigelloides was observed by scan electron microscopy (SEM). From these MVs the LCE toxin was extracted and confirmed by biological and serological assays. These data suggest that P. shigelloides also exports this cytotoxic-enterotoxin by membrane vesicles, a different mechanism of delivering extra cellular virulence factors, so far not described in this bacterium.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Survie cellulaire
/
Plesiomonas
/
Vésicules cytoplasmiques
/
Facteurs de virulence
/
Rivières
/
Entérotoxines
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Braz. j. infect. dis
Thème du journal:
Maladies transmissibles
Année:
2016
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Universidade Estadual de Campinas/BR
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