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Ribosome Modulation Factor,an Important Protein for Cell Viability Encoded by the Polyamine Modulon
Authors:Yusuke Terui  Yuzuru Tabei  Mariko Akiyama  Kyohei Higashi  Hideyuki Tomitori  Kaneyoshi Yamamoto  Akira Ishihama  Kazuei Igarashi  Keiko Kashiwagi
Abstract:We searched for proteins whose synthesis is enhanced by polyamines at the stationary phase of cell growth using an Escherichia coli polyamine-requiring mutant in which cell viability is greatly decreased by polyamine deficiency. The synthesis of ribosome modulation factor (RMF) was strongly enhanced by polyamines at the level of translation at the stationary phase of cell growth. In rmf mRNA, a Shine-Dalgarno (SD) sequence is located 11 nucleotides upstream of the initiation codon AUG. When the SD sequence was moved to the more common position 8 nucleotides upstream of the initiation codon, the degree of polyamine stimulation was reduced, although the level of RMF synthesis was markedly increased. Polyamine stimulation of RMF synthesis was found to be caused by a selective structural change of the bulged-out region of the initiation site of rmf mRNA. The decrease in cell viability caused by polyamine deficiency was prevented by the addition of a modified rmf gene whose synthesis is not influenced by polyamines. The results indicate that polyamines enhance cell viability of E. coli at least in part by enhancing RMF synthesis.
Keywords:Bacteria   Polyamines   RNA Structure   Translation   Translation Regulation   Bulged-out Nucleotides of Double-stranded RNA   Cell Viability   Polyamine Modulon   Polyamine Stimulation
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