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HU and integration host factor function as auxiliary proteins in cleavage of phage lambda cohesive ends by terminase.
- Source :
-
Journal of bacteriology [J Bacteriol] 1991 Mar; Vol. 173 (5), pp. 1670-6. - Publication Year :
- 1991
-
Abstract
- HU and integration host factor (IHF) are small, basic heterodimeric DNA-binding proteins which participate in transcription initiation, DNA replication, and recombination. We constructed isogenic Escherichia coli strains in which HU, IHF, or both proteins were absent. Bacteriophage lambda did not grow in hosts lacking both HU and IHF. Phage DNA replication and late gene transcription were normal in the double mutants, but packaging of lambda DNA was defective. Mature phage DNA molecules were absent, indicating that terminase was unable to linearize lambda DNA. Phage variants carrying a small substitution near cos or the ohm1 mutation in the terminase gene, Nul, formed plaques on HU- IHF- strains. We propose that HU or IHF is required to establish the higher-order DNA-protein structure at cos that is the substrate for lambda terminase.
- Subjects :
- Bacterial Proteins genetics
Bacteriophage lambda genetics
DNA Replication
DNA-Binding Proteins genetics
Deoxyribonuclease I
Escherichia coli genetics
Integration Host Factors
Kinetics
Nucleic Acid Hybridization
RNA, Messenger genetics
Recombination, Genetic
Restriction Mapping
Transcription, Genetic
Bacterial Proteins metabolism
Bacteriophage lambda metabolism
DNA-Binding Proteins metabolism
Endodeoxyribonucleases metabolism
Escherichia coli metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 0021-9193
- Volume :
- 173
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Journal of bacteriology
- Publication Type :
- Academic Journal
- Accession number :
- 1825651
- Full Text :
- https://doi.org/10.1128/jb.173.5.1670-1676.1991