Trypsin cDNAs
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Insect bioassays were carried out of field strain of Helicoverpa armigera that survived on Bt cotton. These insects were reared on Cry1Ac incorporated diet that served as the initial culture for selection of resistance. Based on the partial sequences of putative trypsin mRNA of Helicoverpa armigera (accession no. AFO45138) trypsin specific primers were designed.
7p chauchaungayxua12 29-07-2021 13 1 Download
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We have previously reported that two trypsin-like enzymes, acrosin and spermosin, play key roles in sperm penetration through the vitelline coat of the ascidian (Urochordata) Halocynthia roretzi[Sawadaet al. (1984),J. Biol. Chem.259, 2900±2904; Sawadaet al. (1984), Dev. Biol.105, 246±249]. Here, we show the amino-acid sequence of the ascidian preprospermosin, which is deduced from the nucleotide sequence of the isolated cDNA clone.
7p research12 23-04-2013 42 1 Download
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Pest insects such asHelicoverpaspp. frequently feed on plants expressing protease inhibitors. Apparently, their digestive system can adapt to the presence of protease inhibitors. To study this, a trypsin enzymewas purified from the gut of insects that were raised on an inhibitor-containing diet. The amino-acid sequence of this enzyme was analysed by tandem MS, which allowed assignment of 66% of the mature protein amino acid sequence. This trypsin, called HzTrypsin-S, corresponded to a known cDNA sequence fromHelicoverpa. ...
10p tumor12 20-04-2013 23 2 Download
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A cDNA library from tobacco inoculated withRhizoctonia solaniwas con-structed, and several cDNA fragments were identified by differential hybridization screening. One cDNA clone that was dramatically repressed, NtKTI1, was confirmed as a member of the Kunitz plant proteinase inhibi-tor family. RT-PCR analysis revealed that NtKTI1was constitutively expressed throughout the whole plant and preferentially expressed in the roots and stems.
13p viettel02 19-02-2013 31 2 Download