Characterization of Labeled Residues from 5-Diazouracil-2-14C Incorporated into Ribonucleic Acids of Filamentous Escherichia coli1
AUTOR(ES)
Fister, George
RESUMO
E. coli B, filamented with 5-diazouracil (DZU)-2-14C, yielded ribonucleic acid (RNA)-(DZU-2-14C) which was converted by pancreatic ribonuclease to 14C-mono-and oligo-nucleotides. The mixed 14C-mononucleotides isolated by diethylaminoethyl-cellulose fractionation were identified as cytidylic, uridylic, and hydroxyuridylic acids, by using a combination of paper chromatography and treatment with alkaline phosphatase and cytidine deaminase. Rifampin blocked incorporation of DZU-2-14C under conditions which inhibit RNA synthesis. Division inhibition by DZU-2-14C and the incorporation into Escherichia coli B were retarded by uracil but not by other RNA bases. In a pyrimidine-requiring E. coli, DZU substituted for uracil or cytosine to an extent limited by toxic effects. Cytosine and uracil retarded these effects and retarded the incorporation of DZU-2-14C into the pyrimidineless strain. A small proportion of DZU-2-14C was converted by the latter strain into hydroxyuridylic acid, but the bulk of the incorporated label was in cytidylic and uridylic acid, as in the wild strain.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=248279Documentos Relacionados
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