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DNA repair in Proteus mirabilis

IV. Post-irradiation DNA degradation as influenced by a function inducible in rec + cells

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Summary

Post-irradiation DNA degradation in P. mirabilis rec + strains after UV irradiation is found to be more extensive in starvation buffer than in growth medium. In growth medium restriction of protein synthesis, but not DNA synthesis, largely prevents the expression of “breakdown limitation”. By the addition of chloramphenicol during post-irradiation incubation in growth medium the expression of break-down limitation was followed and found to occur 20 to 40 min after UV irradiation. Pre-irradiation by a low dose of UV leads after a corresponding time of post-irradiation incubation to breakdown limitation even in starvation buffer after a second UV exposure.

Post-irradiation DNA degradation is presumed to be initiated at the sites of DNA lesions which arise at replication points damaged by UV. While pre-starvation restricts the efficiency of postirradiation DNA degradation by the reduction of the number of replication points active at the time of irradiation, caffeine as well as 2,4-dinitrophenol inhibit DNA degradation even in rec - cells probably by the interference with nicking or exonucleoltytic events initiated at those sites in the absence of breakdown limitation.

Breakdown limitation is postulated to be due to inducible derepression of REC-functions which lead to the protection and, probably, repair of DNA lesions arising at the replication points following UV exposure.

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Authors and Affiliations

  1. Zentralinstitut für Genetik und Kulturpflanzenforschung der AdW der DDR, 4325, Gatersleben, German Democratic Republic

    Jürgen Hofemeister

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  1. Jürgen Hofemeister
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Communicated by B.A. Bridges

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Hofemeister, J. DNA repair in Proteus mirabilis . Molec. Gen. Genet. 154, 35–41 (1977). https://doi.org/10.1007/BF00265574

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  • DOI: https://doi.org/10.1007/BF00265574

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