Multifunctional and Redundant Roles of Leptospira interrogans Proteins in Bacterial-Adhesion and fibrin clotting inhibition

Autor(es)

Pereira, Priscila R. M. ^{[1, 2]} ; Fernandes, Luis G. V. ^{[1, 2]} ; de Souza, Gisele O. ^[3] ; Vasconcellos, Silvio A. ^[3] ; Heinemann, Marcos B. ^[3] ; Romero, Eliete C. ^[4] ; Nascimento, Ana L. T. O. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Inst Butantan, Ctr Biotecnol, Ave Vital Brazil 1500, BR-05503900 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Inst Ciencias Biomed, Programa Posgrad Interunidades Biotecnol, Ave Prof Lineu Prestes 1730, BR-05508900 Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, Fac Med Vet & Zootecnia, Lab Zoonoses Bacterianas VPS, Ave Prof Dr Orlando Marques de Paiva 87, BR-05508270 Sao Paulo, SP - Brazil

^[4] Adolfo Lutz Inst, Ctr Bacteriol, Ave Dr Arnaldo 355, BR-01246902 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF MEDICAL MICROBIOLOGY; v. 307, n. 6, p. 297-310, SEP 2017.
• Citações Web of Science: 6

Resumo

Pathogenic Leptopira is the etiological agent of leptospirosis, the most widespread zoonotic infection in the world. The disease represents a major public health problem, especially in tropical countries. The present work focused on two hypothetical proteins of unknown function, encoded by the genes LIC13059 and LIC10879, and predicted to be surface-exposed proteins. The genes were cloned and the proteins expressed using E. colt as a host system. We report that the recombinant proteins interacted with extracellular matrix (ECM) laminin, in a dose dependent fashion and are novel potential adhesins. The recombinant proteins were called Lsa25.6 (rLIC13059) and Lsal6 (rLIC10879), for Leptospiral surface adhesins, followed by the respective molecular masses. The proteins attached to plasminogen (PLG), generating plasmin, in the presence of PLG-activator uPA. Both proteins bind to fibrinogen (Fg), but only Lsa25.6 inhibited fibrin clotting by thrombin-catalyzed reaction. Moreover, Lsal6 interacts with the mammalian cell receptor E-cadherin, and could contribute to bacterial attachment to epithelial cells. The proteins were recognized by confirmed leptospirosis serum samples, suggesting that they are expressed during infection. The corresponding leptospiral proteins are surface exposed based on proteinase K accessibility assay, being LIC10879 most probably exposed in its dimer form. The data of this study extend the spectrum of surface-exposed proteins of L. interrogans and indicate a possible role of the originally annotated hypothetical proteins in infection processes. (AU)

• Processo FAPESP: 15/02590-5 - Caracterização imunogênica e funcional de duas lipoproteínas preditas de Leptospira interrogans expressas em Escherichia coli
• Beneficiário: Priscila Romero Mazzini Pereira
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• 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
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• 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
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/24164-0 - Caracterização da interação de Leptospira interrogans com o sistema protrombina/trombina e possíveis implicações na virulência
• Beneficiário: Luis Guilherme Virgílio Fernandes
• Modalidade de apoio: Bolsas no Brasil - Doutorado