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Applied Microbiology and Biotechnology

, Volume 65, Issue 1, pp 46–55 | Cite as

Isolation and characterization of PRA1, a trypsin-like protease from the biocontrol agent Trichoderma harzianum CECT 2413 displaying nematicidal activity

  • Belen Suarez
  • Manuel Rey
  • Pablo Castillo
  • Enrique Monte
  • Antonio Llobell
Biotechnologically Relevant Enzymes and Proteins

Abstract

Mycoparasitic Trichoderma strains secrete a complex set of hydrolytic enzymes under conditions related to antagonism. Several proteins with proteolytic activity were detected in culture filtrates from T. harzianum CECT 2413 grown in fungal cell walls or chitin and the protein responsible for the main activity (PRA1) was purified to homogeneity. The enzyme was monomeric, its estimated molecular mass was 28 kDa (SDS-PAGE), and its isoelectric point 4.7–4.9. The substrate specificity and inhibition profile of the enzyme correspond to a serine-protease with trypsin activity. Synthetic oligonucleotide primers based on N-terminal and internal sequences of the protein were designed to clone a full cDNA corresponding to PRA1. The protein sequence showed <43% identity to mammal trypsins and 47–57% to other fungal trypsin-like proteins described thus far. Northern analysis indicated that PRA1 is induced by conditions simulating antagonism, is subject to nitrogen and carbon derepression, and is affected by pH in the culture media. The number of hatched eggs of the root-knot nematode Meloidogyne incognita was significantly reduced after incubation with pure PRA1 preparations. This nematicidal effect was improved using fungal culture filtrates, suggesting that PRA1 has additive or synergistic effects with other proteins produced during the antagonistic activity of T. harzianum CECT 2413. A role for PRA1 in the protection of plants against pests and pathogens provided by T. harzianum CECT 2413 is proposed.

Keywords

Chitin Trichoderma Culture Filtrate Fungal Cell Wall Trichoderma Strain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Belen Suarez
    • 1
  • Manuel Rey
    • 2
  • Pablo Castillo
    • 3
  • Enrique Monte
    • 4
  • Antonio Llobell
    • 1
    • 5
  1. 1.1IBVF-CIC Isla de la CartujaCSIC/Universidad de SevillaSevillaSpain
  2. 2.Newbiotechnic S.ASevillaSpain
  3. 3.Instituto de Agricultura SostenibleCSICCordobaSpain
  4. 4.Centro Hispano-Luso de Investigaciones AgrariasUniversidad de SalamancaSalamancaSpain
  5. 5.Centro de Investigaciones Científicas Isla de la CartujaInstituto de Bioquímica Vegetal y FotosíntesisSevillaSpain

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