Rosano CL, Bunce SC, Hurwitz C. Localization of polyamine enhancement of protein synthesis to subcellular components of Escherichia coli and Pseudomonas sp. strain Kim.
J Bacteriol 1983;
153:326-34. [PMID:
6336736 PMCID:
PMC217374 DOI:
10.1128/jb.153.1.326-334.1983]
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Abstract
At 5 mM Mg2+, spermidine stimulation of polyphenylalanine synthesis by cell-free extracts of Escherichia coli was found to be about 30 times greater than that by extracts of Pseudomonas sp. strain Kim, a unique organism which lacks detectable levels of spermidine. By means of reconstitution experiments, the target of spermidine stimulation was localized to the protein fraction of the highspeed supernatant component (S-100) of E. coli and was absent from, or deficient in, the S-100 fraction of Pseudomonas sp. strain Kim. The spermidine stimulation did not appear to be due to the presence in the E. coli S-100 fraction of ribosomal protein S1, elongation factors, or E. coli aminoacyl-tRNA synthetases. The failure to observe spermidine stimulation by the Pseudomonas sp. strain Kim S-100 fraction was also not due to a spermidine-enhanced polyuridylic acid degradation. The synthesis of polyphenylalanine by Pseudomonas sp. strain Kim extracts was stimulated by putrescine and by S-(+)-2-hydroxyputrescine to a greater degree than was synthesis by E. coli extracts. The enhancement by putrescine and by S-(+)-2-hydroxyputrescine with Pseudomonas sp. strain Kim extracts was found to be due to effects on its ribosomes.
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