Ellipticine binds to a human telomere sequence: an additional mode of action as a putative anticancer agent?. Ghosh, S., Kar, A., Chowdhury, S., & Dasgupta, D. Biochemistry, 52(24):4127–37, June, 2013.
Ellipticine binds to a human telomere sequence: an additional mode of action as a putative anticancer agent? [link]Paper  doi  abstract   bibtex   
Polyguanine sequences fold into G-quadruplex structures in the presence of monovalent cations. It is accepted that the telomeric DNA region consists of G-quadruplex structure. There are reports that potential G-quadruplex forming motifs are also present in the promoter region of some proto-oncogenes such as c-myc, c-kit, KRAS, etc. Small molecules with the potential to stabilize the telomeric DNA quadruplex have emerged as potential anticancer agents. We have studied the interaction of ellipticine, a putative anticancer agent from a plant source, with a human telomeric DNA sequence (H24). Spectroscopic and calorimetric studies indicate that the association of ellipticine with H24 is an entropically driven phenomenon with a 2:3 (H24:ellipticine) stoichiometry. Though ellipticine binding does not induce any major structural perturbation in H24, the association leads to formation of a complex with enhanced thermal stability. An assay with the telomerase repeat amplification protocol shows that ellipticine inhibits telomerase activity in MDAMB-231 breast cancer cell line extracts. This is the first report of the quadruplex binding ability of ellipticine. Using the results, we propose that along with DNA intercalation and/or topoisomerase II inhibition, interaction with the telomeric DNA region and the resultant inhibition of telomerase activity might be an additional mode of action for its anticancer property.
@article{Ghosh2013,
	title = {Ellipticine binds to a human telomere sequence: an additional mode of action as a putative anticancer agent?},
	volume = {52},
	issn = {1520-4995},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/23697684},
	doi = {10.1021/bi400080t},
	abstract = {Polyguanine sequences fold into G-quadruplex structures in the presence of monovalent cations. It is accepted that the telomeric DNA region consists of G-quadruplex structure. There are reports that potential G-quadruplex forming motifs are also present in the promoter region of some proto-oncogenes such as c-myc, c-kit, KRAS, etc. Small molecules with the potential to stabilize the telomeric DNA quadruplex have emerged as potential anticancer agents. We have studied the interaction of ellipticine, a putative anticancer agent from a plant source, with a human telomeric DNA sequence (H24). Spectroscopic and calorimetric studies indicate that the association of ellipticine with H24 is an entropically driven phenomenon with a 2:3 (H24:ellipticine) stoichiometry. Though ellipticine binding does not induce any major structural perturbation in H24, the association leads to formation of a complex with enhanced thermal stability. An assay with the telomerase repeat amplification protocol shows that ellipticine inhibits telomerase activity in MDAMB-231 breast cancer cell line extracts. This is the first report of the quadruplex binding ability of ellipticine. Using the results, we propose that along with DNA intercalation and/or topoisomerase II inhibition, interaction with the telomeric DNA region and the resultant inhibition of telomerase activity might be an additional mode of action for its anticancer property.},
	number = {24},
	journal = {Biochemistry},
	author = {Ghosh, Saptaparni and Kar, Anirban and Chowdhury, Shantanu and Dasgupta, Dipak},
	month = jun,
	year = {2013},
	pmid = {23697684},
	keywords = {\#nosource},
	pages = {4127--37},
}

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