title: Pyrrolo[1,2-a]benzimidazole-based aziridinyl quinones. A new class of DNA cleaving agent exhibiting G and A base specificity.
abstract: Pyrrolo[1,2-a]benzimidazole(PBI)-based aziridinyl quinones cleave DNA under reducing conditions specifically at G + A bases without any significant cleavage at C + T bases. The postulated mechanisms involve phosphate alkylation by the reductively activated aziridine to afford a hydrolytically labile phosphotriester as well as the classic N(7) purine alkylation followed by depurination and backbone cleavage. Evidence is presented that the phosphate alkylation mechanism could contribute. The PBIs possess a unique spectrum of cytotoxicity against cancer cells (inactive against leukemia but active against nonsmall cell lung, colon, CNS, melanoma, ovarian, and renal cancers). Also reported are results of in vivo antitumor activity screens.
authors.affiliation: Department of Chemistry and Biochemistry, Arizona State University, Tempe 85287-1604.
authors.forename: E B
authors.initials: EB
authors.lastname: Skibo
authors.forename: W G
authors.initials: WG
authors.lastname: Schulz
mesh_terms: D000478:Alkylation / Q000187:drug effects; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D001388:Aziridines / Q000494:pharmacology*; D001483:Base Sequence; D001562:Benzimidazoles / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D004247:DNA / Q000187:drug effects; D051379:Mice; D008819:Mice, Nude; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000737:chemistry; D011809:Quinones / Q000494:pharmacology*; D013329:Structure-Activity Relationship; D014407:Tumor Cells, Cultured / Q000187:drug effects*
chemical_list: D000970:Antineoplastic Agents; D001388:Aziridines; D001562:Benzimidazoles; D010446:Peptide Fragments; D011809:Quinones; C083824:azamitosene; D004247:DNA