DNA Ligase Mutants of Escherichia coli
- 1 November 1970
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 67 (3), 1580-1587
- https://doi.org/10.1073/pnas.67.3.1580
Abstract
A procedure is described for the isolation of Escherichia coli mutants with either excess or deficient DNA ligase activity. A mutant that overproduces DNA ligase supports the growth of ligase-defective (gene 30 mutant) T4 phages. Even T4 rII-gene 30 double mutants, which are able to grow in normal E. coli, cannot grow in cells deficient in DNA ligase. A functional DNA ligase, supplied either by the phage or the host, thus seems to be required for T4 growth. An E. coli strain that makes a temperature-sensitive DNA ligase becomes radiation-sensitive at high temperature, but otherwise grows normally and shows no obvious defect in DNA replication.Keywords
This publication has 27 references indexed in Scilit:
- Role of polynucleotide ligase in T4 DNA replicationJournal of Molecular Biology, 1968
- Properties of a temperature-sensitive radiation-sensitive mutant of Escherichia coli.Proceedings of the National Academy of Sciences, 1968
- Mechanism of DNA chain growth, II. Accumulation of newly synthesized short chains in E. coli infected with ligase-defective T4 phages.Proceedings of the National Academy of Sciences, 1968
- Mechanism of DNA chain growth. I. Possible discontinuity and unusual secondary structure of newly synthesized chains.Proceedings of the National Academy of Sciences, 1968
- Enzymatic breakage and joining of deoxyribonucleic acid. II. The structural gene for polynucleotide ligase in bacteriophage T4.Proceedings of the National Academy of Sciences, 1967
- Enzymatic joining of DNA strands: a novel reaction of diphosphopyridine nucleotide.Proceedings of the National Academy of Sciences, 1967
- Linkage of polynucleotides through phosphodiester bonds by an enzyme from Escherichia coli.Proceedings of the National Academy of Sciences, 1967
- Enzymatic breakage and joining of deoxyribonucleic acid, I. Repair of single-strand breaks in DNA by an enzyme system from Escherichia coli infected with T4 bacteriophage.Proceedings of the National Academy of Sciences, 1967
- Formation of covalent circles of lambda DNA by E. coli extracts.Proceedings of the National Academy of Sciences, 1967
- Cohesive sites on the deoxyribonucleic acids from several temperate coliphagesJournal of Molecular Biology, 1966