Please use this identifier to cite or link to this item:
|Title:||Effects of the antimicrobial peptide gomesin on the global gene expression profile, virulence and biofilm formation of Xylella fastidiosa|
|Authors:||Fogaca, Andrea C.|
Zaini, Paulo A.
Wulff, Nelson A.
Silva, Patricia I. P. da
Fazio, Marcos A. [UNIFESP]
Miranda, Antonio [UNIFESP]
Silva, Aline M. da
Universidade de São Paulo (USP)
Fundo Defesa Citricultura
Universidade Federal de São Paulo (UNIFESP)
gene expression profile
|Citation:||Fems Microbiology Letters. Malden: Wiley-Blackwell, v. 306, n. 2, p. 152-159, 2010.|
|Abstract:||In the xylem vessels of susceptible hosts, such as citrus trees, Xylella fastidiosa forms biofilm-like colonies that can block water transport, which appears to correlate to disease symptoms. Besides aiding host colonization, bacterial biofilms play an important role in resistance against antimicrobial agents, for instance antimicrobial peptides (AMPs). Here, we show that gomesin, a potent AMP from a tarantula spider, modulates X. fastidiosa gene expression profile upon 60 min of treatment with a sublethal concentration. DNA microarray hybridizations revealed that among the upregulated coding sequences, some are related to biofilm production. in addition, we show that the biofilm formed by gomesin-treated bacteria is thicker than that formed by nontreated cells or cells exposed to streptomycin. We have also observed that the treatment of X. fastidiosa with a sublethal concentration of gomesin before inoculation in tobacco plants correlates with a reduction in foliar symptoms, an effect possibly due to the trapping of bacterial cells to fewer xylem vessels, given the enhancement in biofilm production. These results warrant further investigation of how X. fastidiosa would respond to the AMPs produced by citrus endophytes and by the insect vector, leading to a better understanding of the mechanism of action of these molecules on bacterial virulence.|
|Appears in Collections:||Em verificação - Geral|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.