期刊
BIOLOGICAL CHEMISTRY
卷 386, 期 4, 页码 383-389出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/BC.2005.046
关键词
cDNA cloning; E coli; insect proteinases; proteinase inhibitor; recombinant expression; wheat proteinase
A cDNA encoding the proteinase inhibitor WSCI (wheat subtilisin/chymotrypsin inhibitor) was isolated by RTPCR. Degenerate oligonucleotide primers were designed based on the amino acid sequence of WSCI and on the nucleotide sequence of the two homologous inhibitors (CI-2A and CI-2B) isolated from barley. For large-scale production, wsci cDNA was cloned into the E coli vector pGEX-2T The fusion protein GST-WSCI was efficiently produced in the bacterial expression system and, as the native inhibitor, was capable of inhibiting bacterial subtilisin, mammalian chymotrypsins and chymotrypsin-like activities present in crude extracts of a number of insect larvae (Helicoverpa armigera, Plodia interpunctella and Tenebrio molitor). The recombinant protein produced was also able to interfere with chymotrypsin-like activity isolated from immature wheat caryopses. These findings support a physiological role for this inhibitor during grain maturation.
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