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- W2028098813 abstract "We have localized a functional region of the RNA bacteriophage Qβ replicase following an extensive mutational analysis. Using the method of oligonucleotide linker-insertion mutagenesis, we specifically introduced mutations into a cloned DNA copy of the Qβ replicase gene so that the resulting replicase products would putatively contain small amino acid insertions. In a selective phenotypic assay, we screened mutant replicases for RNA-directed replication activity in vivo. Analysis of 37 different mutant clones indicated that Qβ replicase can accept amino acid substitutions and insertions at several sites at the amino and carboxy termini without abolishing functional activity in vivo or in vitro. However, disruption within the internal amino acid sequence resulted almost exclusively in nonfunctional enzyme. The results suggest that the central region of the replicase protein contains a rigid amino acid composition that is required for replicase function, whereas the amino and carboxy termini are much more receptive to small amino acid insertions and substitutions. These experiments should further enable us to analyze the coding function of the Qβ replicase gene independently of other phage RNA functions contained within this nucleotide region." @default.
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- W2028098813 date "1989-02-01" @default.
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- W2028098813 title "Qβ replicase: Mapping the functional domains of an RNA-dependent RNA polymerase" @default.
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- W2028098813 doi "https://doi.org/10.1016/0022-2836(89)90319-7" @default.
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