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. 1986 Feb;165(2):353–356. doi: 10.1128/jb.165.2.353-356.1986

Influence of growth rate and iron limitation on the expression of outer membrane proteins and enterobactin by Klebsiella pneumoniae grown in continuous culture.

J M Lodge, P Williams, M R Brown
PMCID: PMC214423  PMID: 2935522

Abstract

The influence of the growth rate on outer membrane protein composition and enterobactin production was studied with Klebsiella pneumoniae grown under conditions of iron limitation in chemostats. More enterobactin was produced at fast (D = 0.4 h-1) and slow (D = 0.1 h-1) growth rates in continuous cultures than in either logarithmic- or stationary-phase batch cultures. When the growth rate was controlled under conditions of carbon limitation and the iron level was reduced to 0.5 microM, the iron-regulated outer membrane proteins and enterobactin were induced at the fast growth rate. At the slow growth rate, although the iron-regulated outer membrane proteins were barely visible, a significant level of enterobactin was still produced. These results suggest that under conditions of either carbon or iron limitation, the growth rate can influence the induction of the high-affinity iron uptake system of K. pneumoniae. Other outer membrane proteins, including a 39-kilodalton peptidoglycan-associated protein, were found to vary with the growth rate and nutrient limitation.

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Selected References

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