Release of Escherichia coli DNA from membrane complexes by single-strand endonucleases.
AUTOR(ES)
Abe, M
RESUMO
Treatment of gently prepared lysates of Escherichia coli with single-strand-specific endonuclease (SI or from mung beans) results in the release of about 90% of the DNA from membranes, as determined by the M band technique. The released DNA has an average molecular weight of about 1.2 X 10(8). Data obtained with endonuclease S1 fit a mathematical model in which substrate sites are at or near membrane attachment sites. Data obtained with pancreatic deoxyribonuclease or x-rays fit a model for double-strand breaks at random sites along the DNA. Fitting data to these models, we estimate that there are 18+/-5 membrane attachment sites. The DNA remaining after S1 nuclease treatment is enriched for the region near the origin of chromosome replication. Therefore, attachment at this region near the origin of chromosome replication. Therefore, attachment at this region appears to be chemically different from that at the other sites along the DNA.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=431278Documentos Relacionados
- A chicken repetitive DNA sequence that is highly sensitive to single-strand specific endonucleases.
- Amplification of single-strand DNA binding protein in Escherichia coli.
- Single-strand breakage in DNA of Escherichia coli exposed to Cd2+.
- Escherichia coli single-strand binding protein organizes single-stranded DNA in nucleosome-like units.
- Mutant single-strand binding protein of Escherichia coli: genetic and physiological characterization.