Identification of a pr1-like Gene of Entomopathogenic Fungus, Beauveria bassiana F-101 Isolated from Thecodiplosis japonensis
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Abstract
Beauveria bassiana F-101, which has high toxicity toward Acantholyda parki as well as Thecodiplosis japonensis, was an isolate to develop an alternative control system against the major forest pests. Up to now, in B. bassiana, only one pr1 gene has been isolated and characterized. Therefore, we here reported the identification of a pr1-like gene, which would be a factor of toxicity from B. bassiana F-101. The oligonucleotides for the amplification of the pr1-like gene, were chosen based on the conserved regions of the subtilisin family enzymes, pr1 genes of B. bassiana and Metarhizium anisopliae, and proteinase K of Tritirachium album. The cloned PCR fragment had 1111 bp including 52 bp intron. The deduced Pr1-like peptide showed a low identity with Pr1s of entomopathogenic fungi such as B. bassiana Pr1 (BbPr1) and M. anisopliae Pr1 (MaPr1) as well as the proteinase K of T. album (TaPrK). Instead, the deduced peptide had a substantially high amino acid sequence identity (> 65%) with the serine proteases of Magnaporthe grisea (MgSPM1) and Podospora anserina (PaPspA). These results,therefore, appear to suggest that the putative Pr1-like peptide of B. bassiana F-101 belongs to the subtilisinlike serine protease family and may be a novel gene.
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