Avaliação de genes diferencialmente expressos em Xylella fastidiosa em condições de adesão

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

Xy/ella fastidiosa is a gram-negative and xylem-limited bacterium, which is the causal agent of diseases of several important crops, such as the Citrus Variegated Chlorosis in Brazil and the Pierce s disease in grapevine. Due the colonization in environment under high pressure, it is believed that the bacterium presents mechanisms of aggregation among the cells and between the cells and the wall of the colonized vessels. This interaction appears to be associated with its pathogenicity. This work aimed the evaluation of differentially expressed genes of Xy/ella fastidiosa in response to an in vitro adhesion condition through microarrays and pattern of proteins in 2D-PAGE. The strain 9a5c was grown as a planldonic population (C), planktonic population in medium containing pieces of wood (5), and bacteria adhered to the wood (L). Growth curves were done in order to standardize the exponential growth phase, which was determined to be between 4 and 6 days for C and 5 and between 6 and 8 days for L. In the microarray analysis, 5 did not show any significant difference from C in the expression pattern of the pool of genes evaluated. On the other hand, in the experiment L versus C, we identified genes belonging to the intermediary metabolism and structural components like membrane and transport proteins. For 2D-PAGE, the extraction of proteins from cells adhered to the wood was not possible because of a contaminant present in the preparation. In the analysis of C versus 5, we identified some proteins differentially expressed, two membrane proteins and a cysteine protease without the N-terminal portion (functional form), which seem to be involved in adhesion in other organisms. The results uncovered new genes and proteins that could be involved in the initial process of adhesion of X. fastidiosa

ASSUNTO(S)

genetica - expressão biofilme

ACESSO AO ARTIGO

Documentos Relacionados