Population Heterogeneity in Corynebacterium glutamicum ATCC 13032 caused by prophage CGP3.

Abstract:

:The genome of Corynebacterium glutamicum type strain ATCC 13032 (accession number BX927147) contains three prophages, CGP1, CGP2, and CGP3. We recently observed that many genes within the CGP3 prophage region have increased mRNA levels in a dtxR deletion mutant that lacks the master regulator of iron homeostasis (J. Wennerhold and M. Bott, J. Bacteriol. 188:2907-2918, 2006). Here, we provide evidence that this effect is due to the increased induction of the prophage CGP3 in the dtxR mutant, possibly triggered by DNA damage caused by elevated intracellular iron concentrations. Upon induction, the CGP3 prophage region is excised from the genome and forms a circular double-stranded DNA molecule. Using quantitative real-time PCR, an average copy number of about 0.1 per chromosome was determined for circular CGP3 DNA in wild-type C. glutamicum. This copy number increased about 15-fold in the dtxR mutant. In order to visualize the CGP3 DNA within single cells, a derivative of the wild type was constructed that contained an array of tet operators integrated within the CGP3 region and a plasmid-encoded YFP-TetR fusion protein. As expected, one to two fluorescent foci that represented the chromosomally integrated CGP3 prophage were detected in the majority of cells. However, in a small fraction (2 to 4%) of the population, 4 to 10 CGP3 DNA molecules could be observed in a single cell. Interestingly, the presence of many CGP3 copies in a cell often was accompanied by an efflux of chromosomal DNA, indicating the lysis of the corresponding cell. However, evidence for the formation of functional infective CGP3 phage particles could not be obtained.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Frunzke J,Bramkamp M,Schweitzer JE,Bott M

doi

10.1128/JB.00310-08

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

5111-9

issue

14

eissn

0021-9193

issn

1098-5530

pii

JB.00310-08

journal_volume

190

pub_type

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