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- W2893971796 abstract "The interaction of Escherichia coli DNA-dependent RNA polymerase (EC 2.7.7.6) with the replicative form of the DNA from the filamentous coliphage fd cleaved by the restriction endonuclease HindII has been studied by electron microscopy at low and high ionic strength. In the presence of ATP or GTP, and heparin, RNA polymerase binds to fd replicative-form DNA at a few specific sites which have been mapped. The map was oriented so that transcription is from right to left. Three main GTP initiator sites are found at 15%, 82% and 94% of the genome length. One main ATP initiator site is found which cannot be mapped with the same accuracy, and which is localized between 38% and 50%. In the absence of initiator triphosphates and heparin, the binding of the enzyme to fd DNA is much more heterogeneous and therefore the mapping is more difficult. Nevertheless it seems that the preferential binding regions correspond to the specific sites mapped in the presence of GTP or ATP. The mean number of polymerase molecules bound to DNA as a function of the molecular ratio enzyme to DNA present in the mixture has been determined. From these results a binding isotherm can be obtained. The apparent equilibrium constant (K∼ 109 M−1) which is derived certainly represents an underestimated value, as discussed." @default.
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- W2893971796 date "1977-08-01" @default.
- W2893971796 modified "2023-09-23" @default.
- W2893971796 title "Electron Microscopy Analysis of the Interaction between Escherichia coli DNA-Dependent RNA Polymerase and the Replicative Form of Phage fd DNA. 1. Mapping of the Binding Sites" @default.
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- W2893971796 doi "https://doi.org/10.1111/j.1432-1033.1977.tb11731.x" @default.
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