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- W1605959992 abstract "A poly(A) polymerase has been purified from the soluble protein fraction of calf thymus gland. The activity is cytoplasmic and nonparticulate. Mn-2+ATP is the preferred substrate. On the basis of disc gel electrophoresis in sodium dodecyl sulfate-acrylamide gels, gel filtration, and sedimentation velocity in sucrose gradients, the enzyme has a molecular weight of 62,000 and appears to consist of one polypeptide chain. The enzyme preparation is shown to be nearly homogeneous by disc gel electrophoresis and isoelectric-focusing. The activity has a pI of about 7.4. The specific activity of the enzyme is about 1700 mumol per hour per mg of protein, giving a turnover number of about 1800 mol of substrate per mol of enzyme min- minus 1. The activity is highly specific for ATP and is inhibited by other ribonucleoside triphosphates. It is sensitive to high levels of RNA-polymerase inhibitors. Km for oligoadenylate is 50 muM in the presence of Mn-2+ and 200 muM in Mg-2+ and equivalent Vmax is achieved with either metal ion. The initiator function may be filled by a variety of oligoribonucleotides having a free 3'-OH." @default.
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- W1605959992 date "1975-06-01" @default.
- W1605959992 modified "2023-09-30" @default.
- W1605959992 title "Purification of terminal riboadenylate transferase from calf thymus gland." @default.
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- W1605959992 doi "https://doi.org/10.1016/s0021-9258(19)41329-x" @default.
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