Current Microbiology

, Volume 53, Issue 3, pp 217–221

Isolation, Characterization, and Transcriptional Analysis of the Chitinase chi2 Gene (DQ011663) from the Biocontrol Fungus Metarhizium anisopliae var. anisopliae

  • César Milton Baratto
  • Valéria Dutra
  • Juliano Tomazzoni Boldo
  • Leonardo Barbosa Leiria
  • Marilene Henning Vainstein
  • Augusto Schrank
Article

DOI: 10.1007/s00284-006-0078-6

Cite this article as:
Baratto, C.M., Dutra, V., Boldo, J.T. et al. Curr Microbiol (2006) 53: 217. doi:10.1007/s00284-006-0078-6

Abstract

Metarhizium anisopliae infects arthropods via a combination of specialized structures and cuticle degradation. Hydrolytic enzymes are accepted as key factors for the host penetration step and include chitinases. The characterization of the chi2 chitinase gene from M. anisopliae var. anisopliae is reported. The chi2 gene is interrupted by two short introns and is 1,542-bp long, coding a predicted protein of 419 amino acids with a stretch of 19 amino acid residues displaying characteristics of signal peptide. The predicted chitinase molecular mass is 44 kDa with a mature protein of 42 kDa and a theoretical pI of 4.8. The comparison of the CHI2 predicted protein to fungal orthologues revealed similarity to the glycohydrolase family 18 and a phylogenetic analysis was conducted. The chi2 gene is up-regulated by chitin as a carbon source and in conditions of fungus autolysis, and is down-regulated by glucose. This regulation is consistent with the presence of putative CreA/Crel/Crr1 carbon catabolic repressor binding domains on the regulatory sequence.

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • César Milton Baratto
    • 1
  • Valéria Dutra
    • 1
  • Juliano Tomazzoni Boldo
    • 1
  • Leonardo Barbosa Leiria
    • 1
  • Marilene Henning Vainstein
    • 1
    • 2
  • Augusto Schrank
    • 1
    • 3
  1. 1.Centro de BiotecnologiaPrograma de Pós-graduação em Biologia Celular e Molecular Universidade Federal do Rio Grande do SulPorto AlegreBrazil
  2. 2.Departamento de Microbiologia, Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do SulPorto AlegreBrazil
  3. 3.Departamento de Biologia Molecular e Biotecnologia. Instituto de BiociênciasUniversidade Federal do Rio Grande do SulPorto AlegreBrazil