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- W2000795897 abstract "A technique has been developed to probe directly RecA-DNA interactions by the use of the fluorescent chromophore, (+)anti-benzo(a)pyrene-7,8-dihydrodiol-9,10-epoxide (BPDE), covalently attached to DNA. The 24-mer oligonucleotide 5'-d(CTACTAAACATGTACAAATCATCC) was specifically modified on the exocyclic nitrogen of the central guanine, to yield a trans-adduct. Upon interaction of the modified oligonucleotide with RecA we find an increase in BPDE fluorescence and a rather high fluorescence anisotropy, suggesting a restricted motion of the BPDE-oligonucleotide in the protein filament. In the presence of the cofactor ATP gamma S, binding of two oligonucleotides, identical or complementary in sequence, in the RecA filament is possible. The RecA-DNA complex is, however, more stable when the sequences are complementary; in addition, a shift in the BPDE emission peaks is observed. In the presence of ATP (and an ATP regeneration system), the RecA-DNA interaction between two complementary oligonucleotides is changes, and we now find protein-mediated renaturation to occur." @default.
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- W2000795897 date "1995-07-10" @default.
- W2000795897 modified "2023-10-17" @default.
- W2000795897 title "Fluorescence-detected interactions of oligonucleotides in RecA complexes" @default.
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- W2000795897 doi "https://doi.org/10.1016/0014-5793(95)00600-e" @default.
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