Archives of Microbiology

, Volume 201, Issue 2, pp 223–233 | Cite as

Biochemical characterization of a Kunitz inhibitor from Inga edulis seeds with antifungal activity against Candida spp.

  • Heloisa Xavier Dib
  • Daniella Gorete Lourenço de Oliveira
  • Caio Fernando Ramalho de Oliveira
  • Gabriel Bonan Taveira
  • Erica de Oliveira Mello
  • Newton Valério Verbisk
  • Marilene Rodrigues Chang
  • Dario Corrêa Junior
  • Valdirene Moreira Gomes
  • Maria Lígia Rodrigues MacedoEmail author
Original Paper


We describe the characterization of IETI, the first trypsin inhibitor purified from Inga edulis, a tree widely distributed in Brazil. Two-step chromatography was used to purify IETI, a protein composed of a single peptide chain of 19,685.10 Da. Amino-terminal sequencing revealed that IETI shows homology with the Kunitz family, as substantiated by its physical–chemical features, such as its thermal (up to 70 °C) and wide-range pH stability (from 2 to 10), and the value of its dissociation constant (6.2 nM). IETI contains a single reactive site for trypsin, maintained by a disulfide bridge; in the presence of DTT, its inhibitory activity was reduced in a time- and concentration-dependent manner. IETI presented activity against Candida ssp., including C. buinensis and C. tropicalis. IETI inhibitory activity triggered yeast membrane permeability, affecting cell viability, thus providing support for the use of IETI in further studies for the control of fungal infections.


Trypsin inhibitor Membrane permeability Candida tropicalis Candida buinensis 



This work was supported by CNPq (407127/2013-5), CAPES and FINEP.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Heloisa Xavier Dib
    • 1
  • Daniella Gorete Lourenço de Oliveira
    • 1
  • Caio Fernando Ramalho de Oliveira
    • 1
  • Gabriel Bonan Taveira
    • 2
  • Erica de Oliveira Mello
    • 2
  • Newton Valério Verbisk
    • 3
  • Marilene Rodrigues Chang
    • 4
  • Dario Corrêa Junior
    • 4
  • Valdirene Moreira Gomes
    • 2
  • Maria Lígia Rodrigues Macedo
    • 1
    Email author
  1. 1.Laboratório de Purificação de Proteínas e suas Funções Biológicas, Faculdade de Ciências de Alimentos e NutriçãoUniversidade Federal do Mato Grosso do SulCampo GrandeBrazil
  2. 2.Laboratório de Fisiologia e Bioquímica de MicrorganismosUniversidade Estadual do Norte FluminenseCampos dos GoytacazesBrazil
  3. 3.Embrapa Gado de CorteCampo GrandeBrazil
  4. 4.Laboratório de Pesquisas Microbiológicas, Faculdade de Ciências de Alimentos e NutriçãoUniversidade Federal do Mato Grosso do SulCampo GrandeBrazil

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