Previous Article | Next Article ![]()
Appl. Environ. Microbiol., 07 1995, 2713-2719, Vol 61, No. 7
WC Hazeleger, JD Janse, PM Koenraad, RR Beumer, FM Rombouts and T Abee
The effect of temperature and the availability of nutrients on the
transition of spiral Campylobacter jejuni cells to coccoid forms was
investigated. Ageing of spiral C. jejuni cells in either nutrient-poor or
nutrient-rich environments resulted in the formation of nonculturable
coccoid cells at 4, 12, and 25 degrees C after different periods, with the
cells incubated at 4 degrees C in nutrient-deficient media remaining
culturable the longest. To study the phenomenon, ATP levels, protein
profiles, and fatty acid compositions were monitored under conditions where
the transition from spiral to coccoid cells occurred. During storage, the
levels of intracellular ATP were highest in cells incubated at low
temperatures (4 and 12 degrees C) and remained constant after a small
initial decrease. During the transformation from spiral to coccoid forms,
no alteration in protein profiles could be detected; indeed, inhibition of
protein synthesis by chloramphenicol did not influence the transition.
Furthermore, DNA damage by gamma irradiation had no effect on the process.
Membrane fatty acid composition of cocci formed at low temperatures was
found to be almost identical to that of spiral cells, whereas that of cocci
formed at 25 degrees C was clearly different. Combining these results, it
is concluded that the formation of cocci is not an active process. However,
distinctions between cocci formed at different temperatures were observed.
Cocci formed at 4 degrees C show characteristics comparable to those of
spirals, and these cocci may well play a role in the contamination cycle of
C. jejuni.(ABSTRACT TRUNCATED AT 250 WORDS)
Copyright © 1995, American Society for Microbiology
Temperature-dependent membrane fatty acid and cell physiology changes in coccoid forms of Campylobacter jejuni
Department of Food Science, Wageningen Agricultural University, The Netherlands.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»