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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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Pokeweed antiviral protein (PAP), one of ribosome inactivating proteins (RIPs), has very strong toxicity both to prokaryotic and eukaryotic cells. To produce mutant PAPs nontoxic to cells, the PAP-cDNA was inserted into a yeast-E. coli shuttle vector under the control of galactose promoter, mutagenized using hydroxylamine, and transformed into yeast cells. Transformed yeast cells were selected on the uracil-deficient plate containing glucose or raffinose, and the yeast cells producing mutant PAPs nontoxic to cells were then selected on the galactose plate. Eighteen mutants were obtained by immunoblot analyses of 1,000 transformants: among them, three, ten and five mutants produced unprocessed, mature and truncated PAPs, respectively. Fourteen PAP mutants among them did not inhibit the yeast cell growth, and showed no or less inhibition of protein synthesis in vitro. Six among fourteen mutants were able to protect TMV infection in coinoculation expreiment. The mutant PAPs showing an antiviral activity either without or reduced RIP activity contain neither the active site mutation nor C-terminal deletion mutation. These results suggest that both the RIP activity and the antiviral activity will require other amino acid residue(s) besides the active site and that the antiviral activity of PAP can be dissociated from its toxicity.
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