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• W2014402886 startingPage "47" @default.
• W2014402886 abstract "The binding characteristics of the interaction of gene 5 protein with polynucleotides, i.e. poly(dA), poly(dT) and M13 DNA, have been determined by following the quenching of the protein fluorescence. In general, the binding is highly co-operative and for the binding of the protein to poly(dA) and M13 DNA the co-operativity parameter ω is estimated to have values between 50 and 300. Under comparable experimental conditions, the intrinsic binding constant Kint is at least two orders of magnitude higher for poly(dT) than for poly(dA), while the value for M13 DNA is intermediate. For poly(dA), the binding has been studied as a function of ionic strength and temperature. From these experiments it can be concluded that ionic interactions as well as van der Waals interactions (e.g. stacking interactions) are important for the complex formation of the protein with polynucleotides. From a comparison of the binding of the protein to poly(dA) and poly(dT), it is concluded that stacking interactions in the polynucleotide have a negative influence on protein binding. This conclusion, in conjunction with the weak temperature dependence of Kint. indicates that ionic interactions play a major role in the stabilization of the protein-poly(dA) complex. The co-operativity factor ω is little or not dependent on the ionic strength or the type of polynucleotide involved in binding. It is determined by interactions between complexed protein molecules. These interactions are primarily non-electrostatic. The binding characteristics obtained for the gene 5 protein-polynucleotide complexes are compared with those we have found for the binding to small oligonucleotides. It appears that oligonucleotide and polynucleotide binding differ in many aspects; i.e. there is a difference in Kint, ω and the number of nucleotides covered. The validity of linear lattice binding theories is discussed in this context. By comparing the binding parameters found for the gene 5 protein with those of the Escherichia coli DNA binding protein I. it is possible to explain the displacement of the E. coli protein by the gene 5 protein that occurs in vivo." @default.
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• W2014402886 date "1983-01-01" @default.
• W2014402886 modified "2023-10-14" @default.
• W2014402886 title "Fluorescence studies of the complex formation between the gene 5 protein of bacteriophage M13 and polynucleotides" @default.
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• W2014402886 doi "https://doi.org/10.1016/0022-2836(83)90029-3" @default.
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