Molecular cloning of chitinase cDNAs from the silkworm, Bombyx mori and the fall webworm, Hyphantria cunea

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Title
Molecular cloning of chitinase cDNAs from the silkworm, Bombyx mori and the fall webworm, Hyphantria cunea
Author(s)
Mi Gwang Kim; Sang Woon Shin; Kyung Sook Bae; S C Kim; Ho Yong Park
Bibliographic Citation
Insect Biochemistry and Molecular Biology, vol. 28, pp. 163-171
Publication Year
1998
Abstract
As encoding chitinases were cloned and characterized from Bombyx mori and Hyphantria cunea, and their gene expression during the metamorphosis was also studied. The chitinase eDNA from B. mori encodes a protein of 565 amino acids with a calculated molecular mass of 63.4 kDa and the H. cunea chitinase cDNA encodes a protein of 553 amino acids with a calculated molecular mass of 62.0 kDa. Amino acid alignment of the two chitinases revealed 75% homology and 77-80% with M. sexta chitinase. The putative cleavage site of the signal peptide was between amino acid residues 20 and 21 for both chitinases. There were three potential N-glycosylation sites in the chitinase of B. mori at the amino acid residues 86-89. NFTS, 304-307, NATG, 398-401, NYTV, whereas two potential N-glycosylation sites were present at the amino acid residues 86- 89, NFTA and 304-307, NATG, in that of H. cunea. Southern blot analysis of total genomic DNA suggested that the B. mori genome has only one chitinase gene detectable by the eDNA probe and the H. cunea genome has one or two chitinase gene copies. Northern analysis indicated that gene expression was up-regulated during the molting process, larval-pupal transformation and pupal-adult transformation, when enzymatic degradation of cuticle was occurring.
Keyword
ChitinaseBombyx moriHyphantria cuneacDNA cloningNucleotide sequenceDevelopmental expression
ISSN
0965-1748
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/S0965-1748(97)00112-4
Type
Article
Appears in Collections:
Division of Biomedical Research > Microbiome Convergence Research Center > 1. Journal Articles
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