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. 1978 Jul;135(1):178–189. doi: 10.1128/jb.135.1.178-189.1978

Evidence for the specific association of the chromosomal origin with outer membrane fractions isolated from Escherichia coli.

A A Nicolaidis, I B Holland
PMCID: PMC224803  PMID: 353029

Abstract

DNA-envelope complexes isolated from osmotically lysed spheroplasts of Escherichia coli contained 0.2 to 1% of the total cellular DNA after labeling with [3H]thymidine. Molecular weight determinations indicated that the amount of bound DNA was equivalent in most cases to a maximum of three binding sites per chromosome. Bound DNA from E. coli B/r was distributed approximately equally between inner and outer membrane components when envelopes were fractionated on sucrose equilibrium gradients. Outer membrane-DNA complexes, in particular, fraction H1, with a density of 1.24 g/cm3, were quite stable against shearing and against Sarkosyl NL97. In the case of E. coli B/r, H1-DNA was also relatively resistant to deoxyribonuclease. Inner membrane-DNA complexes, in contrast, were quite labile and readily dissociated to release free DNA. The outer membrane fractions did not appear to contain replication fork DNA, but small amounts may have been present in the inner membrane complexes. A two- to eightfold enrichment for chromosomal origin DNA in the envelope was obtained when cultures of E. coli K-12, synchronized for DNA replication, were pulse labeled at different times in the replication cycle. This enrichment was found invariably in the outer membrane fractions. However, the data do not exclude the possibility that this DNA is bound to regions of adhesion between inner and outer membranes which sediment with a density indistinguishable from that of the outer membrane.

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Selected References

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