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Master's Dissertation
DOI
https://doi.org/10.11606/D.87.2017.tde-17012017-150239
Document
Author
Full name
Laura Cristina Lima Diniz
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Silva Junior, Pedro Ismael da (President)
Durigon, Edison Luiz
Oliveira, Ursula Castro de
Riske, Karin do Amaral
Title in Portuguese
Identificação e caracterização de peptídeos antimicrobianos da hemolinfa de Triatoma infestans (Hemiptera: Reduviidae).
Keywords in Portuguese
Triatoma infestans
Fibrinopeptídeo A
Peptídeos antimicrobianos
Tachykinin-like
Triastina
Abstract in Portuguese
Em Triatoma infestans ainda não há pesquisas de isolamento de Peptídeos Antimicrobianas e como têm contato muitos microrganismos acreditamos que eles produzem esses componentes antimicrobianos. Neste estudo identificamos quatro peptídeos antimicrobianos principais. Os Tin-TK-I e Tin-TK-II que são similares com Taquicininas de insetos, não são hemolíticos e ativos contra três bactérias e três fungos, e são capazes de lisar membranas. Tin-TK-I é degradado por aminopeptidases e tem estrutura randômica. Tin-TK-II é degradado por carboxipeptidases e tem estrutura de hélice 310. A Triastina que é similar a uma proteína cuticular de T. infestans, é ativa contra duas bactérias e três fungos, não hemolítica, forma uma hélice 310, lisa membranas, e sofre ação de carboxi e aminopeptidases. E o Triatogênio que é similar ao fibrinopeptideo-A humano, e possui um análogo. É ativo contra três bactérias e seis fungos, e seu análogo contra três bactérias e três fungos. Não são hemolíticos, formam poros em membranas, formam alfa-hélices e são degradados por aminopeptidases.
Title in English
Identification and Caracterization of Antimicrobial Peptides from the Hemolymph of Triatoma infestans (Hemiptera: Reduviidae).
Keywords in English
Triatoma infestans
Antimicrobial peptides
Fibrinopeptide A
Infestin
Tachykinin-like molecules
Abstract in English
Regarding new researches with Antimicrobial Peptides in triatomines, none have been developed with T. infestans, and due to its survival in a highly infectious habitat, we believe that it products antimicrobial molecules. On this study, four main AMPs have been identified. Tin-TK-I and II that were similar to Tachykinin-like proteins from insects, they were not hemolytic, and were active against three bacteria and three fungi on the antimicrobial assay. Tin-TK-I presents a random structure and was degraded by aminopeptidases, as Tin-TK-II presents a helix 310 structure and was affected by carboxipeptidases. Both of them can disrupt negatively charged membranes. Triastin that was similar to a cuticular protein from T. infestans, was active against two bacteria and three fungi, had no hemolytic activity, presents a helix 310 structure and can disrupt negatively charged membranes. Triatogen was similar to the human fibrinopeptide A, and it has an analogue. Triatogen was active against three bacteria and six fungi, and its analogue was active against three bacteria and three fungi. They were not active against human erythrocytes, both were degraded by aminopeptidases. They can generate pores on membranes and both have alfa-helix structure.
 
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Publishing Date
2017-01-18
 
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