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J Med Chem. 2013 Jul 25;56(14):5709-21. doi: 10.1021/jm400290q. Epub 2013 Jul 5.

Mahanine, a DNA minor groove binding agent exerts cellular cytotoxicity with involvement of C-7-OH and -NH functional groups.

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Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Kolkata 700032, India.


Mahanine, a carbazole alkaloid is a potent anticancer molecule. To recognize the structure-activity correlation, mahanine was chemically modified. Antiproliferative activity of these derivatives was determined in 19 cancer cell lines from 7 different origins. Mahanine showed enhanced apoptosis compared to dehydroxy-mahanine-treated cells, indicating significant contribution of the C-7-OH group. O-Methylated-mahanine and N-methylated dehydroxy-mahanine-treated cells exhibited apoptosis only at higher concentrations, suggesting additional contribution of 9-NH group. Using biophysical techniques, we demonstrated that mahanine interacts with DNA through strong association with phosphate backbone compared to other derivatives but is unable to induce any conformational change in DNA, hence suggesting the possibility of being a minor groove binder. This was corroborated by molecular modeling and isothermal titration calorimetry studies. Taken together, the results of the current study represent the first evidence of involvement of C-7-OH and 9-NH group of mahanine for its cytotoxicity and its minor groove binding ability with DNA.

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