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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Characterization of two new putative adhesins of Leptospira interrogans

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Figueredo, Jupciana M. ; Siqueira, Gabriela H. ; de Souza, Gisele O. ; Heinemann, Marcos B. ; Vasconcellos, Silvio A. ; Chapola, Erica G. B. ; Nascimento, Ana L. T. O.
Número total de Autores: 7
Tipo de documento: Artigo Científico
Fonte: MICROBIOLOGY-SGM; v. 163, n. 1, p. 37-51, JAN 2017.
Citações Web of Science: 3

We here report the characterization of two novel proteins encoded by the genes LIC11122 and LIC12287, identified in the genome sequences of Leptospira interrogans, annotated, respectively, as a putative sigma factor and a hypothetical protein. The CDSs LIC11122 and LIC12287 have signal peptide SPII and SPI and are predicted to be located mainly at the cytoplasmic membrane of the bacteria. The genes were cloned and the proteins expressed using Escherichia coli. Proteinase K digestion showed that both proteins are surface exposed. Evaluation of interaction of recombinant proteins with extracellular matrix components revealed that they are laminin binding and they were called Lsa19 (LIC11122) and Lsa14 (LIC12287), for Leptospiral-surface adhesin of 19 and 14 kDa, respectively. The bindings were dose-dependent on protein concentration, reaching saturation, fulfilling the ligand-binding criteria. Reactivity of the recombinant proteins with leptospirosis human sera has shown that Lsa19 and, to a lesser extent, Lsa14, are recognized by antibodies, suggesting that, most probably, Lsa19 is expressed during infection. The proteins interact with plasminogen and generate plasmin in the presence of urokinase-type plasminogen activator. Plasmin generation in Leptospira has been associated with tissue penetration and immune evasion strategies. The presence of a sigma factor on the cell surface playing a secondary role, probably mediating host -pathogen interaction, suggests that LIC11122 is a moonlighting protein candidate. Although the biological significance of these putative adhesins will require the generation of mutants, our data suggest that Lsa19 is a potential candidate for future evaluation of its role in adhesion/colonization activities during L. interrogans infection. (AU)

Processo FAPESP: 12/23913-9 - Identificação e caracterização de proteínas de Leptospira interrogans envolvidas nas interações patógeno - hospedeiro
Beneficiário:Ana Lucia Tabet Oller Do Nascimento
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 14/50981-0 - Busca de proteínas de superfície nas sequências do genoma da Leptospira interrogans: caracterização funcional e imunológica para o entendimento de mecanismos envolvidos na patogênese de bactéria
Beneficiário:Ana Lucia Tabet Oller Do Nascimento
Linha de fomento: Auxílio à Pesquisa - Temático