E-viri
Recenzirano
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Marchesini, María Inés; Ugalde, Juan Esteban; Czibener, Cecilia; Comerci, Diego José; Ugalde, Rodolfo Augusto
Microbial pathogenesis, 08/2004, Letnik: 37, Številka: 2Journal Article
Secreted as well as surface exposed proteins are assumed to play major roles in bacterial virulence. In this report we describe the construction of an N-terminal protein-capturing system and its use for the isolation of Brucella abortus S2308 genes coding for putative surface exposed or secreted proteins. For this purpose, a cloning vector that generates gene fusions to a ribosome binding site and start codon deficient Chloramphenicol Acetyl Transferase (CAT) reporter gene was constructed and the resulting library introduced into B. abortus S2308 and virB mutant strains. Secreted translational fusions were identified by determining CAT activity in culture supernatants. Secretion was confirmed by Western Blot using a polyclonal anti-CAT antibody. A total of 864 clones were screened and 10 genes encoding putative secreted/surface exposed proteins were identified. Seven are Brucella proteins with an assigned function, whereas three are hypothetical proteins. The number of amino acid residues that promotes CAT secretion varies from 5 to 386 and no conserved motifs were detected. Secretion in a virB mutant background of some of the isolated fusion proteins was also determined. Interestingly, some hybrid proteins seemed to require a full VirB system for their secretion.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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