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- W1657088788 abstract "A great deal has been learned in the last 15 years with regard to how helicase enzymes participate in DNA metabolism and how they interact with their DNA substrates. However, many questions remain unanswered. Of critical importance is an understanding of how NTP hydrolysis and hydrogen-bond disruption are coupled. Several models exist and are being tested; none has been proven. In addition, an understanding of how a helicase disrupts the hydrogen bonds holding duplex DNA together is lacking. Recently, helicase enzymes that unwind duplex RNA and DNA.RNA hybrids have been described. In some cases, these are old enzymes with new activities. In other cases, these are new enzymes only recently discovered. The significance of these reactions in the cell remains to be clarified. However, with the availability of significant amounts of these enzymes in a highly purified state, and mutant alleles in most of the genes encoding them, the answers to these questions should be forthcoming. The variety of helicases found in E. coli, and the myriad processes these enzymes are involved in, were perhaps unexpected. It seems likely that an equally large number of helicases will be discovered in eukaryotic cells. In fact, several helicases have been identified and purified from eukaryotic sources ranging from viruses to mouse cells (4-13, 227-234). Many of these helicases have been suggested to have roles in DNA replication, although this remains to be shown conclusively. Helicases with roles in DNA repair, recombination, and other aspects of DNA metabolism are likely to be forthcoming as we learn more about these processes in eukaryotic cells." @default.
- W1657088788 created "2016-06-24" @default.
- W1657088788 creator A5009832120 @default.
- W1657088788 date "1991-01-01" @default.
- W1657088788 modified "2023-09-27" @default.
- W1657088788 title "DNA Helicases of Escherichia coli" @default.
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