Nucleic Acids Research, 1988, Vol. 16, No. 9 3877-3888
© 1988
Articles |
Adenosine-guanosine preferential photocleavage of DNA by azido-benzoyl- and diazocyclopenta-dienylcarbonyloxy derivatives of 9-aminoacridine
Department of Biochemistry B, The Panum Institute, University of Copenhagen Blegdamsvej 3, DK-2200 Copenhagen 1The Bioorganic Group, Chemical Laboratory II, The H.C.Ørsted Institute, University of Copenhagen, Universitetsparken 5 DK-2100 Copenhagen, Denmark
* To whom correspondence should be addressed
Received December 29, 1987. Revised April 7, 1988. Accepted April 7, 1988.
The photoreactions of 9-[6-(4-azidobenzamido)hexylamino]acridine (AHA) and 9-[6-(2-diazocyclopentadienylcarbonyloxy)hexylamino]acridine (DHA) with double stranded DNA result in formation of single strand nicks and alkali labile sites (adducts) with an efficiency of 6x103 nicks per AHA and 3x102 nicks per DHA molecule. The alkali dependent DNA cleavage by AHA shows a pronounced A+G preference whereas that by DHA is practically sequence independent. In the presence of diacridines, however, DHA exhibits a preference for cleavage at guanosines. These DNA photocleaving reagents could be useful for DNA photofootprinting and photosequencing.