Thermal stability of Escherichia coli-Salmonella typhimurium deoxyribocleic acid duplexes - PubMed (original) (raw)
Thermal stability of Escherichia coli-Salmonella typhimurium deoxyribocleic acid duplexes
D J Brenner et al. J Bacteriol. 1968 Jun.
Abstract
Single-stranded, labeled deoxyribonucleic acid (DNA) fragments from Escherichia coli were incubated at 60 and 66 C with a large excess of single-stranded, unlabeled DNA fragments from E. coli and Salmonella typhimurium. The resulting reassociated DNA was adsorbed to hydroxylapatite and eluted in a series of washes at increasing temperatures. The thermal stability of the reassociated DNA was determined by means of this procedure. Neither the extent of reassociation nor stability of the reassociated E. coli DNA was affected by increasing the incubation temperature from 60 to 66 C. The double-stranded molecules resulting from the reassociation of E. coli DNA with S. typhimurium DNA had a markedly lower thermal stability than reassociated E. coli DNA. More reassociation occurred between E. coli and S. typhimurium at 60 C than at 66 C. In addition, the product of interspecies reassociation occurring at 66 C had a higher thermal stability than that occurring at 60 C. Preliminary results indicate that the decreased thermal stability of the interspecies duplex is in part the result of unpaired bases.
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