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- W2102860779 endingPage "15026" @default.
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- W2102860779 abstract "During the construction of the transmissible gastroenteritis virus (TGEV) full-length cDNA clone, a point mutation at position 637 that was present in the defective minigenome DI-C was maintained as a genetic marker. Sequence analysis of the recovered viruses showed a reversion at this position to the original virus sequence. The effect of point mutations at nucleotide 637 was analyzed by reverse genetics using a TGEV full-length cDNA clone and cDNAs from TGEV-derived minigenomes. The replacement of nucleotide 637 of TGEV genome by a T, as in the DI-C sequence, or an A severely affected virus recovery from the cDNA, yielding mutant viruses with low titers and small plaques compared to those of the wild type. In contrast, T or A at position 637 was required for minigenome rescue in trans by the helper virus. No relationship between these observations and RNA secondary-structure predictions was found, indicating that mutations at nucleotide 637 most likely had an effect at the protein level. Nucleotide 637 occupies the second codon position at amino acid 108 of the pp1a polyprotein. This position is predicted to map in the N-terminal polyprotein papain-like proteinase (PLP-1) cleavage site at the p9/p87 junction. Replacement of G-637 by A, which causes a drastic amino acid change (Gly to Asp) at position 108, affected PLP-1-mediated cleavage in vitro. A correlation was found between predicted cleaving and noncleaving mutations and efficient virus rescue from cDNA and minigenome amplification, respectively." @default.
- W2102860779 created "2016-06-24" @default.
- W2102860779 creator A5059996554 @default.
- W2102860779 creator A5080035490 @default.
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- W2102860779 date "2005-12-15" @default.
- W2102860779 modified "2023-09-25" @default.
- W2102860779 title "A Point Mutation within the Replicase Gene Differentially Affects Coronavirus Genome versus Minigenome Replication" @default.
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- W2102860779 doi "https://doi.org/10.1128/jvi.79.24.15016-15026.2005" @default.
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