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3 Biotech

, 8:369 | Cite as

Production and characterization of a thermostable antifungal chitinase secreted by the filamentous fungus Aspergillus niveus under submerged fermentation

  • Thaís Barboni Alves
  • Pedro Henrique de Oliveira Ornela
  • Arthur Henrique Cavalcanti de Oliveira
  • João Atílio Jorge
  • Luis Henrique Souza Guimarães
Original Article
  • 34 Downloads

Abstract

The filamentous fungus Aspergillus niveus produced extracellular antifungal chitinase when cultured under submerged fermentation (SbmF) using crab shells as the carbon source. Maximal chitinase production was achieved at 192 h of cultivation using minimal medium containing 1% chitin. The enzyme was purified 1.97-fold with 40% recovery by ammonium sulfate precipitation and Sephadex G-100 gel filtration. The molecular mass was estimated to be 44 kDa by both 12% SDS-PAGE and Sepharose CL-6B gel filtration. Maximal A. niveus chitinase activity was obtained at 65 °C and pH 5.0. The enzyme was fully stable at 60 °C for up to 120 min and the enzymatic activity was increased by Mn2+. In the presence of reducing and denaturing compounds, the enzyme activity was not drastically affected. The chitinase was able to hydrolyze colloidal chitin, azure chitin, and 4-nitrophenyl N-acetyl-β-D glucosaminide; for the latter, the K0.5 and maximal velocity (Vmax) were 3.51 mM and 9.68 U/mg of protein, respectively. The A. niveus chitinase presented antifungal activity against Aspergillus niger (MIC = 84 µg/mL), A. fumigatus (MIC = 21 µg/mL), A. flavus (MIC = 24 µg/mL), A. phoenicis (MIC = 24 µg/mL), and Paecilomyces variotii (MIC = 21 µg/mL). The fungus A. niveus was able to produce a thermostable and denaturation-resistant chitinase able to inhibit fungal development, signaling its biotechnological potential.

Keywords

Aspergillus niveus Antifungal activity Chitin Chitinase Fungal hydrolases 

Notes

Acknowledgements

We thank Mauricio de Oliveira for technical assistance. The authors also kindly acknowledge the financial support from FAPESP (Process no. 2011/50880-1) and the research scholarships from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). This manuscript is part of the doctoral thesis by T.B.A.

Author contributions

LHSG and TBA designed the study; TBA performed the experiments on chitinase production, purification, and characterization; PHOO performed the experiments on antifungal activity; LHSG, TBA, AHCO, and JAJ analyzed the results; LHSG and TBA wrote the manuscript.

Compliance with ethical standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Copyright information

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

Authors and Affiliations

  • Thaís Barboni Alves
    • 1
  • Pedro Henrique de Oliveira Ornela
    • 1
  • Arthur Henrique Cavalcanti de Oliveira
    • 1
  • João Atílio Jorge
    • 2
  • Luis Henrique Souza Guimarães
    • 1
    • 2
  1. 1.Instituto de QuímicaUniversidade Estadual PaulistaAraraquaraBrazil
  2. 2.Faculdade de Filosofia Ciências e Letras de Ribeirão PretoUniversidade de São PauloRibeirão PretoBrazil

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