Purification and characterization of a new ribopolynucleotide synthesizing enzyme from Escherichia coli. |
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Authors: | S Ohasa A Tsugita |
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Institution: | Department of Microbiology, Biozentrum of the University of Basel Basel, Switzerland |
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Abstract: | A new type of ribopolynucleotide-synthesizing enzyme was found both on cytoplasmic membranes and in protein-DNA complexes isolated from Escherichia coli. The enzyme was purified by exploiting a specific, reversible enzyme aggregation with ATP and spermidine. The purified enzyme (more than 90% pure) was free from other enzymatic activities such as ATPase and polynucleotide phosphorylase. The enzyme (molecular weight 270,000 ± 15%) contains two kinds of polypeptide chain (molecular weights 91,000 ± 10%, and 45,000 ± 10%) and these polypeptides are not common with those of DNA-dependent RNA polymerase. The enzyme catalyses the synthesis of ribopolynucleotides from nucleoside triphosphates in the presence of 1 mm-MgCl2. Rifampicin and streptolydigin do not affect the enzyme reaction. |
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