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[Spontaneous DNA damage and DNA polynucleotide ligase activity in thymocyte populations differing in radiosensitivity].

Single-strand breaks (SB) in DNA of irradiated thymocytes are first repaired, at a half-recovery period of a few minutes, then the number of breaks rapidly increases indicating that in addition to chromatin endonucleolysis there is an imbalance between the repair enzymes that generate DNA breaks and eliminate them. The rate of SB accumulation in thymocyte fractions, upon incubation of the cells with 1-beta-D-arabinofuranosyl cytosine (AraC) and hydroxyurea (HU), is directly proportional to their radiosensitivity, whereas DNA ligase activity is higher in a fraction of highly radioresistant thymocytes. Chemical compounds that increase the survival rate of irradiated thymocytes decelerate SB accumulation in DNA and sensitivity of cells to AraC and HU. Ineffective substances have no such an effect.

Animals↗
PubMed1972

Polynucleotide ligase in bacteriophage T4D recombination.

Following infection of E. coli B with ligase-deficient rII bacteriophage T4D recombination between linked markers is increased 4.2 fold and heterozygote frequency increased 2.3 fold. In such infection recombination occurs at a rapid rate for an extended period. This is in contrast to the time course of recombination observed in wild-type, lysis-inhibited, or lysis-defective (gene t defective) infection. In all of these cases recombination under standard cross conditions occurs early in the vegetative cycle. The increased recombination in ligase-deficient rII infection is reduced in a bacterial strain which produces greater than normal levels of host ligase. These results indicate that ligase has a crucial role not only in the replication of DNA but also in recombination. The level of ligase may determine whether DNA replication occurs with or without concomitant recombination.

Bacteriolysis↗
PubMed1974

Suppression of a mutation in gene 3 of bacteriophage T7 (T7 endonuclease I) by mutations in phage and host polynucleotide ligase.

Bacteriophage T7 bearing amber mutations in both gene 1.3 (T7 DNA ligase) and gene 3 (T7 endonuclease I) are viable when grown in suppressor-negative, ligase-negative hosts. This is evidenced by a high plating efficiency and a large burst size compared to the single mutants. These findings may be explained by a limited destruction of cellular DNA by the double mutant.

Carbon Radioisotopes↗
PubMed1977

The involvement of polynucleotide ligase in the repair of UV-induced DNA damage in Escherichia coli K-12 cells.

The effect of the ligts-7 mutation on cell survival and the extent of DNA repair after UV (254 nm) irradiation was determined for wild-type and uvrB5 cells of E. coli K-12 at 30 degrees and 42 degrees C. At the restrictive temperature (42 degrees C) the ligts-7 mutation resulted in (i) a decrease in the extent of repair of DNA incision breaks arising during the excision repair process, and (ii) a decrease in the extent of post-replicational repair of gaps in newly-synthesized DNA. These deficiencies in DNA repair correlated with increases in cellular sensitivity to killing by UV radiation. Thus, DNA lagase plays an important role in vivo in both the excision and post-replicational repair processes.

DNA Repair↗