Nucleic Acids Research, 1985, Vol. 13, No. 8 2789-2802
© 1985
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A complex of single-strand binding protein and M13 DNA as hybridization probe
Orion Genetic Engineering Laboratory Valimotie 7, SF-00380 Helsinki *Department of Electron Microscopy, University of Helsinki Mannerheimintie 172, SF-00280 Helsinki +Recombinant DNA Laboratory, University of Helsinki Valimotie 7, SF-00380 Helsinki, Finland
Received January 17, 1985. Revised March 20, 1985. Accepted March 20, 1985.
Single-stranded DNA was complexed to the single-strand binding protein (SSB) of Escherichia coli in a mass ratio of 30:1. The protein moiety of this complex can be labelled by a number of methods of which we have chosen radio-iodination and biotinylation as examples. The SSB-M13 DNA complexes, labelled to high specific activities, were used as probes in hybridization experiments in which 1.6x1018 moles of immobilized target DNA were detected. The stability of the hybrids was not severely decreased by the binding of SSB. Analysis of hybrids by electron microscopy showed that complexing of DNA with SSB could be used to allow its subsequent identification in the hybrids.
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