Abstract:
:Starvation of cells for the DNA building block dTTP is strikingly lethal (thymineless death, TLD), and this effect is observed in all organisms. The phenomenon, discovered some 60 years ago, is widely used to kill cells in anticancer therapies, but many questions regarding the precise underlying mechanisms have remained. Here, we show for the first time that starvation for the DNA precursor dGTP can kill E. coli cells in a manner sharing many features with TLD. dGTP starvation is accomplished by combining up-regulation of a cellular dGTPase with a deficiency of the guanine salvage enzyme guanine-(hypoxanthine)-phosphoribosyltransferase. These cells, when grown in medium without an exogenous purine source like hypoxanthine or adenine, display a specific collapse of the dGTP pool, slow-down of chromosomal replication, the generation of multi-branched nucleoids, induction of the SOS system, and cell death. We conclude that starvation for a single DNA building block is sufficient to bring about cell death.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Itsko M,Schaaper RMdoi
10.1371/journal.pgen.1004310subject
Has Abstractpub_date
2014-05-08 00:00:00pages
e1004310issue
5eissn
1553-7390issn
1553-7404pii
PGENETICS-D-13-01774journal_volume
10pub_type
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