Eur. J. Entomol. 104 (2): 173-180, 2007 | DOI: 10.14411/eje.2007.026

A gut-specific chitinase from the mulberry longicorn beetle, Apriona germari (Coleoptera: Cerambycidae): cDNA cloning, gene structure, expression and enzymatic activity

Young Moo CHOO1, Kwang Sik LEE1, Bo Yeon KIM1, Doh Hoon KIM1, Hyung Joo YOON2, Hung Dae SOHN1, Byung Rae JIN*,1
1 College of Natural Resources and Life Science, Dong-A University, Busan 604-714, Korea
2 Department of Agricultural Biology, National Institute of Agricultural Science and Technology, Suwon 441-100, Korea

A gut-specific chitinase gene was cloned from the mulberry longicorn beetle, Apriona germari. The A. germari chitinase (AgChi) gene spans 2894 bp and consists of five introns and six exons coding for 390 amino acid residues. AgChi possesses the chitinase family 18 active site signature and three N-glycosylation sites. Southern blot analysis of genomic DNA suggests that AgChi is a single copy gene. The AgChi cDNA was expressed as a 46-kDa polypeptide in baculovirus-infected insect Sf9 cells and the recombinant AgChi showed activity in a chitinase enzyme assay. Treatment of recombinant virus-infected Sf9 cells with tunicamycin, a specific inhibitor of N-linked glycosylation, revealed that AgChi is N-glycosylated, but the carbohydrate moieties are not essential for chitinolytic activity. Northern and Western blot analyses showed that AgChi was specifically expressed in the gut; AgChi was expressed in three gut regions, indicating that the gut is the prime site for AgChi synthesis in A. germari larvae.

Keywords: Cerambycidae, Apriona germari, baculovirus expression vector, cDNA cloning, chitinase, enzyme, gene structure, mulberry longicorn beetle

Received: July 7, 2006; Revised: October 18, 2006; Accepted: October 18, 2006; Published: April 25, 2007  Show citation

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CHOO, Y.M., LEE, K.S., KIM, B.Y., KIM, D.H., YOON, H.J., SOHN, H.D., & JIN, B.R. (2007). A gut-specific chitinase from the mulberry longicorn beetle, Apriona germari (Coleoptera: Cerambycidae): cDNA cloning, gene structure, expression and enzymatic activity. EJE, 104(2), 173-180. doi: 10.14411/eje.2007.026
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