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http://dx.doi.org/10.7852/ijie.2012.25.1.115

Molecular Cloning and Characterization of Chymotrypsin Inhibitor and Chitin-Binding Protein Homologs from the Bumblebee Bombus terrestris  

Qiu, Yuling (College of Natural Resources and Life Science, Dong-A University)
Yoon, Hyung-Joo (Department of Agricultural Biology, National Academy of Agricultural Science)
Jin, Byung-Rae (College of Natural Resources and Life Science, Dong-A University)
Publication Information
International Journal of Industrial Entomology and Biomaterials / v.25, no.1, 2012 , pp. 115-121 More about this Journal
Abstract
The bumblebee Bombus terrestris is widely used in greenhouses to pollinate crops. Here, we report the molecular cloning and characterization of chymotrypsin inhibitor and chitin-binding protein homologs from B. terrestris. Two cDNAs encoding chymotrypsin inhibitor (Bt-CI) and chitin-binding protein (Bt-CBP) homologs were cloned from B. terrestris. Gene sequence analysis showed that Bt-CI gene consists of three exons encoding 75 amino acids, including a predicted 20-amino acid signal peptide, while Bt-CBP consists of two exons encoding 78 amino acids, including a predicted 26-amino acid signal peptide. The mature Bt-CI and Bt-CBP peptides contain ten and six conserved cysteine residues, respectively. Database searches using the deduced sequences of Bt-CI and Bt-CBP showed similarity to those from B. impatiens (96% peptide sequence identities). Bt-CI and Bt-CBP were expressed in both the venom gland and fat body of B. terrestris worker bees. The recombinant Bt-CI and Bt-CBP peptides were expressed in baculovirus-infected insect cells. Taken together, our findings describe the molecular characterization of Bt-CI and Bt-CBP from B. terrestris.
Keywords
Bombus terrestris; Bumblebee; Chitin-binding protein; Chymotrypsin inhibitor; Gene cloning;
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