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. 1975 Aug;123(2):481–491. doi: 10.1128/jb.123.2.481-491.1975

Ribonucleic acid destruction and synthesis during intraperiplasmic growth of Bdellovibrio bacteriovorus.

R B Hespell, G F Miozzari, S C Rittenberg
PMCID: PMC235752  PMID: 1097411

Abstract

During growth of Bdellovibrio bacteriovorus on (2-14C)uracil-labeled Escherichia coli approximately 50% of the radioactivity is incorporated by the bdellovibrio and most of the remainder is released as free nucleic acid bases. Kinetic studies showed that 50 and 30S ribosomal particles and 23 and 16S ribosomal ribonucleic acid (RNA) of E. coli are almost completely degraded by the first 90 min in a 210- to 240-min bdellovibrio developmental cycle. Synthesis of bdellovibrio ribosomal RNA was first detected after 90 min. The specific activity and the ratio of radioactivity in the bases of the synthesized bdellovibrio RNA was essentially the same as those of the substrate E. coli. The total radioactivity of the bdellovibrio deoxyribonucleic acid (DNA) exceeded that in the DNA of the substrate E. coli cell, and the ratio of radioactivity of cytosine to thymine residues differed. Intraperiplasmic growth of B. bacteriovorus in the presence of added nucleoside monophosphates (singly or in combination) significantly decreased the uptake of radioactivity from (2-14C)uracil-labeled E. coli; nucleosides or nucleic acid bases did not. It is concluded that the RNA of the substrate cell, in the form of nucleoside monophosphates, is the major or exclusive precursor of the bdellovirbrio RNA and also serves as a precursor for some of the bdellovibrio DNA.

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Selected References

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