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Infect Immun, August 1998, p. 3862-3866, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Vector Development for the Expression of Foreign
Proteins in the Vaccine Strain Brucella abortus
S19
Diego J.
Comerci,1 2
Guido D.
Pollevick,1
Ana M.
Vigliocco,2
Alberto C. C.
Frasch,1 and
Rodolfo
A.
Ugalde1 *
Instituto de Investigaciones Biotecnologicas,
Universidad Nacional de General San Martin, INTI, San Martin, Provincia
de Buenos Aires,1 and
Grupo de
Investigaciones Pecuarias, Centro Atomico Ezeiza, Comision Nacional
de Energia Atomica, Buenos Aires,2 Argentina
Received 12 January 1998/Returned for modification 18 February
1998/Accepted 22 April 1998
A vector for the expression of foreign antigens in the vaccine
strain Brucella abortus S19 was developed by using a DNA
fragment containing the regulatory sequences and the signal peptide of the Brucella bcsp31 gene. This fragment was cloned in
broad-host-range plasmid pBBR4MCS, resulting in plasmid pBEV. As a
reporter protein, a repetitive antigen of Trypanosoma cruzi
was used. The recombinant fusion protein is stably expressed and
secreted into the Brucella periplasmic space, inducing a
good antibody response against the T. cruzi antigen. The
expression of the repetitive antigen in Brucella neither
altered its growth pattern nor generated a toxic or lethal effect
during experimental infection. The application of this strategy for the
generation of live recombinant vaccines and the tagging of B. abortus S19 vaccine is discussed. This is the first time that a
recombinant protein has been expressed in the periplasm of brucellae.
*
Corresponding author. Mailing address: Instituto de
Investigaciones Biotecnologicas, Universidad Nacional de General San
Martin, INTI, Av. General Paz y Albarellos (Ed. 24), Casilla de Correo 30 (1650), San Martin, Provincia de Buenos Aires, Argentina. Phone: (54-1) 752-0021. Fax: (54-1) 752-9639. E-mail:
rugalde{at}inti.gov.ar.
Infect Immun, August 1998, p. 3862-3866, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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