Synthesis of New Alkylated Mononucleotide Analogues and Their Repair Proficiency by the Prokaryotic DNA Repair Protein AlkB
摘要:
We describe the synthesis of a variety of new alkylated mononucleotides and examine their repair proficiency with the prokaryotic direct DNA repair protein AlkB. A comparison of rates of repair among the different substrates supports the currently accepted radical mechanism.
Pyrrolo[1,2-a]benzimidazole-based aziridinyl quinones. A new class of DNA cleaving agent exhibiting G and A base specificity
作者:Edward B. Skibo、William G. Schulz
DOI:10.1021/jm00073a002
日期:1993.10
Pyrrolo[1,2-a]benzimiazole(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.