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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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