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. 1990 Oct;172(10):5690–5696. doi: 10.1128/jb.172.10.5690-5696.1990

Acquisition of polyamines by the obligate intracytoplasmic bacterium Rickettsia prowazekii.

R R Speed 1, H H Winkler 1
PMCID: PMC526884  PMID: 2120188

Abstract

Both the polyamine content and the route of acquisition of polyamines by Rickettsia prowazekii, an obligate intracellular parasitic bacterium, were determined. The rickettsiae grew normally in an ornithine decarboxylase mutant of the Chinese hamster ovary (C55.7) cell line whether or not putrescine, which this host cell required in order to grow, was present. The rickettsiae contained approximately 6 mM putrescine, 5 mM spermidine, and 3 mM spermine when cultured in the presence or absence of putrescine. Neither the transport of putrescine and spermidine by the rickettsiae nor a measurable rickettsial ornithine decarboxylase activity could be demonstrated. However, we demonstrated the de novo synthesis of polyamines from arginine by the rickettsiae. Arginine decarboxylase activity (29 pmol of 14CO2 released per h per 10(8) rickettsiae) was measured in the rickettsiae growing within their host cell. A markedly lower level of this enzymatic activity was observed in cell extracts of R. prowazekii and could be completely inhibited with 1 mM difluoromethylarginine, an irreversible inhibitor of the enzyme. R. prowazekii failed to grow in C55.7 cells that had been cultured in the presence of 1 mM difluoromethylarginine. After rickettsiae were grown in C55.7 in the presence of labeled arginine, the specific activities of arginine in the host cell cytoplasm and polyamines in the rickettsiae were measured; these measurements indicated that 100% of the total polyamine content of R. prowazekii was derived from arginine.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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