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Starvation/stationary-phase survival of Rhodococcus erythropolis SQ1: a physiological and genetic analysis

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Abstract

The adaptation of Rhodocccus erythropolis SQ1 to energy and carbon starvation was investigated in terms of both the capacity to survive starvation and the contribution of a nutrient-induced stationary phase to cross-protection to other types of environmental stress. It was found that R. erythropolis SQ1 survives for at least 43 days in LB and distilled water, and 65 days in chemically defined medium (CDM) containing high (1%) or low (0.1%) glucose. Furthermore, early stationary-phase R. erythropolis SQ1 grown in CDM 0.1% exhibited enhanced resistance to heat and oxidative stress compared with exponential-phase cells. A second objective of this study was to identify genetic elements involved in starvation/stationary-phase survival. A mutant bank of R. erythropolis SQ1 generated by random transposon insertion mutagenesis was screened; four mutants lost culturability when grown in CDM 1%. No drop in culturability was observed when these mutants were grown in CDM 0.1%. The DNA flanking transposon insertion could be recovered from three mutants. Transposon insertions were found in uvrB (UvrB, part of the DNA excision repair mechanism), between a putative guaB gene and another guaB-like gene, and between a gene encoding a putative phosphoglycerate mutase and putative thioredoxin/cytochrome c biogenesis genes. This represents a first study of the starvation/stationary-phase survival response of Rhodococcus, an organism of immense significance in environmental bioremediation and a number of industrial processes.

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Acknowledgments

The authors thank S. Dunbar for the technical support provided and acknowledge the financial support provided by the award of a PhD studentship by Edinburgh Napier University to NVJF.

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Correspondence to Sophie Foley.

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Communicated by Jan Roelof van der Meer.

The GenBank/EMBL/DDBJ accession numbers for the sequences described in this paper are AM941039–AM941044.

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Fanget, N.V.J., Foley, S. Starvation/stationary-phase survival of Rhodococcus erythropolis SQ1: a physiological and genetic analysis. Arch Microbiol 193, 1–13 (2011). https://doi.org/10.1007/s00203-010-0638-9

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