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Interaction of gene 5 protein of phage f1 with single and double-stranded DNA and polynucleotides

Veĭko, N.N.; Gromova, E.S.; Shabarova, Z.A.

Molekuliarnaia Biologiia 13(5): 1136-1146

1979

ISSN/ISBN: 0026-8984
PMID: 503062
Document Number: 149287
The fluorescence method was used to reveal some differences in the interaction of gene 5 protein of phage f1 with single- and double-stranded polynucleotides (DNA). The binding with the duplexes is non-cooperative and the Kapp is twice lower than that for the cooperative formation of the complex with single-stranded structures. In the complex with a double-stranded polynucleotide (DNA) the protein cover 3 nucleotide pairs. The complex dissociates with a lower concentration of salt and the contribution of the energy of nonelectrostatic interactions to the total energy of complex formation for it is lower than for the complex with single-stranded DNA. In the complex of protein with single-stranded structure the fluorescence of the tyrosine (Tyr) residues is quenched to a greater degree and their accessibility to the external quencher is lower than that of the complex with double-stranded polynucleotides (DNA). The suggestion is made that in destabilization of nucleic double helices by gene 5 protein of phage f1, a great role belongs to Tyr residues because of their high affinity to single-stranded structures and because of their different localization in the complexes with single- and double-stranded polynucleotides.

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