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Biodegradation of feather waste by extracellular keratinases and gelatinases from Bacillus spp.

  • Ana Maria Mazotto
  • Ana Cristina N. de Melo
  • Andrew Macrae
  • Alexandre Soares Rosado
  • Raquel Peixoto
  • Sabrina M. L. Cedrola
  • Sônia Couri
  • Russolina B. Zingali
  • Ana Lúcia V. Villa
  • Leon Rabinovitch
  • Jeane Q. Chaves
  • Alane B. VermelhoEmail author
Original Paper

Abstract

In this study, three feather degrading bacterial strains were isolated from agroindustrial residues from a Brazilian poultry farm. Three Gram-positive, spore-forming, rod-shaped bacteria and were identified as B. subtilis 1271, B. licheniformis 1269 and B. cereus 1268 using biochemical, physiologic and molecular methods. These Bacillus spp. strains grew and produced keratinases and peptidases using chicken feather as the sole source of nitrogen and carbon. B. subtilis 1271 degraded feathers completely after 7 days at room temperature and produced the highest levels of keratinase (446 U ml−1). Feather hydrolysis resulted in the production of serine, glycine, glutamic acid, valine and leucine as the major amino acids. Enzymography and zymography analyses demonstrated that enzymatic extracts from the Bacillus spp. effectively degraded keratin and gelatin substrates as well as, casein, hemoglobin and bovine serum albumin. Zymography showed that B. subtilis 1271 and B. licheniformis 1269 produced peptidases and keratinases in the 15–140 kDa range, and B. cereus produced a keratinase of ~200 kDa using feathers as the carbon and nitrogen source in culture medium. All peptidases and keratinases observed were inhibited by the serine specific peptidase inhibitor phenylmethylsulfonyl fluoride (PMSF). The optimum assay conditions of temperature and pH for keratinase activity were 40–50°C and pH 10.0 for all strains. For gelatinases the best temperature and pH ranges were 50–70°C and pH 7.0–11. These isolates have potential for the biodegradation of feather wastes and production of proteolytic enzymes using feather as a cheap and eco-friendly substrate.

Keywords

Bacillus spp. Feather degradation Feather keratin Keratinase Peptidase 

Notes

Acknowledgments

We would like to thank the technical assistance of Denise da Rocha de Souza supported by fellowships grants from MCT/CNPq. This study was supported by grants from Coordenação de Aperfeiçoamento Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (MCT/CNPq), Conselho de Ensino para Graduados e Pesquisas (CEPG/UFRJ), Fundação Oswaldo Cruz (FIOCRUZ), Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) and Fundação Universitária José Bonifácio (FUJB).

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Ana Maria Mazotto
    • 1
  • Ana Cristina N. de Melo
    • 1
  • Andrew Macrae
    • 1
  • Alexandre Soares Rosado
    • 1
  • Raquel Peixoto
    • 1
  • Sabrina M. L. Cedrola
    • 1
  • Sônia Couri
    • 2
  • Russolina B. Zingali
    • 3
  • Ana Lúcia V. Villa
    • 4
  • Leon Rabinovitch
    • 5
  • Jeane Q. Chaves
    • 5
  • Alane B. Vermelho
    • 1
    Email author
  1. 1.Departamento de Microbiologia Geral, Instituto de Microbiologia Prof. Paulo de Góes (IMPPG), Bloco I, Centro de Ciências da Saúde (CCS)Universidade Federal do Rio de Janeiro (UFRJ), Cidade UniversitáriaIlha do Fundão, Rio de JaneiroBrazil
  2. 2.Instituto Federal de Educação Ciência e Tecnologia do Rio de janeiroMaracanã, Rio de JaneiroBrazil
  3. 3.Departamento de Bioquímica, Instituto de Ciências Biomédicas, Bloco H, Centro de Ciências da Saúde (CCS)Universidade Federal do Rio de Janeiro (UFRJ), Cidade UniversitáriaIlha do Fundão, Rio de JaneiroBrazil
  4. 4.Universidade federal do Rio de Janeiro, Campus MacaéGranja do Cavaleiros, MacaéBrazil
  5. 5.Departamento de BacteriologiaInstituto Oswaldo CruzRio de JaneiroBrazil

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