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- W1658148979 abstract "The cloned Escherichia coli cca gene, described in the accompanying paper (Cudny, H., Lupski, J. R., Godson, G. N., and Deutscher, M. P. (1986) J. Biol. Chem. 261, 6444-6449), has been used to construct strains that overproduce tRNA nucleotidyltransferase, the enzyme that synthesizes the CCA terminus of tRNA. Strain UT481 (pEC4), which contains a 1.9-kilobase cca gene insert in plasmid pUC8, overproduces the enzyme by about 100-150-fold, probably under the control of the cca gene promoter. A second strain, containing a plasmid with a 1.5-kilobase insert, overproduces tRNA nucleotidyltransferase by about 650-fold, to a level of about 3-4% of the soluble cell protein. In this case, overexpression was dependent on the lac promoter of the plasmid. A rapid, two-step procedure was developed to purify large amounts of the enzyme from strain UT481 (pEC4) that was about 40% pure, free of ribonucleases, and suitable for use as a reagent for modification of tRNA molecules. Preparation of milligram quantities of homogeneous tRNA nucleotidyltransferase was accomplished by two further chromatographic steps. The structural and catalytic properties of this purified enzyme were similar to those from partially purified preparations previously described. The availability of large amounts of pure tRNA nucleotidyltransferase will not permit a variety of structural and functional studies of the enzyme that previously were not possible." @default.
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- W1658148979 date "1986-05-01" @default.
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- W1658148979 title "High-level overexpression, rapid purification, and properties of Escherichia coli tRNA nucleotidyltransferase." @default.
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- W1658148979 doi "https://doi.org/10.1016/s0021-9258(19)84583-0" @default.
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