title: Modifications at the C-terminus to improve pyrrole-imidazole polyamide activity in cell culture.
abstract: Pyrrole-imidazole (Py-Im) hairpin polyamides are a class of small molecule DNA minor groove binding compounds that have been shown to modulate endogenous gene expression in cell culture. Gene regulation by polyamides requires efficient cellular uptake and nuclear localization properties for candidate compounds. To further optimize Py-Im polyamides for enhanced potency in cell culture, a focused library of polyamides possessing various modifications at the C-terminus was synthesized and tested. Comparison of polyamide biological activity in two cell lines revealed tolerance for structural modifications and agreement in activity trends between cell lines. The use of an oxime linkage between the polyamide and an aromatic functionality on the C-terminus resulted in a approximately 20-fold increase in the potency of polyamides targeted to the androgen response element (ARE) in LNCaP cells by measuring AR-activated PSA expression.
authors: Division of Chemistry and Chemical Engineering, The California Institute of Technology, 1200 E California Boulevard, Mail Code 164-30, Pasadena, California 91125, USA.
authors: Claire S
authors: CS
authors: Jacobs
authors: Peter B
authors: PB
authors: Dervan
mesh_terms: D000728:Androgens / Q000235:genetics; D001483:Base Sequence; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D004247:DNA / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D007093:Imidazoles / Q000737:chemistry*; D020128:Inhibitory Concentration 50; D009691:Nucleic Acid Denaturation / Q000187:drug effects; D009757:Nylons / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D010091:Oximes / Q000737:chemistry; D011758:Pyrroles / Q000737:chemistry*; D020218:Response Elements / Q000235:genetics; D044366:Transition Temperature / Q000187:drug effects
chemical_list: D000728:Androgens; D007093:Imidazoles; D009757:Nylons; D010091:Oximes; D011758:Pyrroles; C029899:imidazole; D004247:DNA