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. 1982 Dec;152(3):1196–1210. doi: 10.1128/jb.152.3.1196-1210.1982

A gene between polA and glnA retards growth of Escherichia coli when present in multiple copies: physiological effects of the gene for spot 42 RNA.

P W Rice, J E Dahlberg
PMCID: PMC221627  PMID: 6183252

Abstract

We have isolated the single gene for spot 42 RNA of Escherichia coli on a 20-kilobase DNA fragment. Physical characterization of this cloned DNA fragment showed that it is homologous to a region at 86 min on the genetic map and extends from the 23S to 5S rRNA coding region of rrnA to the coding region of glnA, the gene for glutamine synthetase. Other genes included on this cloned DNA fragment are polA, ntrC (glnG), and ntrB (glnL). E coli cells transformed with a multicopy plasmid clone of the gene for spot 42 RNA had about a 10-fold increase in the amount of spot 42 RNA they contained. The amount of 6S RNA in these cells was increased about twofold, although the gene for 6S RNA was not located on this plasmid or on the larger 20-kilobase fragment. Presence of this multicopy plasmid also affected the growth of cells. The generation time was increased under a variety of growth conditions, especially when cells were grown in medium with succinate as the carbon source. In addition, some strains of E. coli which have multicopy plasmids carrying the gene for spot 42 RNA were unable to respond normally to a shift into richer medium: upon upshift from minimal glucose to LB broth or minimal glucose plus 1% Casamino Acids, there was a 3- to 4-h lag before the culture adapted to the new medium. More than 90% of the cells in such cultures stopped dividing, although they remained viable. The plating efficiency of minimal-glucose-grown cells was 100-fold less on rich media than on minimal glucose medium. One revertant was isolated which regained the phenotype of pBR322-transformed cells. Analysis of this strain showed that the plasmid it contained had an insertion of an IS1 element into the 5' end of the coding region for the gene for spot 42 RNA.

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