We have synthesized a series of polyintercalating compounds, including the first known tetraintercalator, based on the 1,4,5,8-naphthalenetetracarboxylic diimide chromophore. The chromophores are attached in a head-to-tail arrangement by peptide linkers and are synthesized by standard solid phase peptide synthesis methods. We report evidence, based on UV-visible spectroscopy and viscometry, that the compounds are fully intercalated upon binding to double-stranded DNA. Using DNAse I footprinting experiments, the bisintercalator 2 was found to bind to DNA in a cooperative manner. The footprinting results as well as association and dissociation kinetics data reveal that the compounds exhibit a tremendous preference for GC over AT sequences. A. mode of binding is proposed in which the compounds intercalate completely from the major groove, and not in a threading manner as may be suggested by their structures. A kinetic scheme is proposed that takes into account the observed cooperativity and fits the data for the dissociations of the polyintercalators from poly(dAdT), although a similar scheme could not adequately model their dissociations from poly(dGdC) or from calf thymus DNA.
Herein we report the synthesis and characterization of a polyintercalator with eight potential intercalating 1,4,5,8-naphthalenetetracarboxylic diimide (NDI) units linked in a head-to-tail arrangement via a peptide linker. W spectroscopy and viscometry measurements indicated the molecule binds to double-stranded DNA with all eight NDI units intercalated simultaneously. Competition dialysis and DNAse 1 footprinting studies revealed a preference for GC-rich regions of DNA, and circular dichroism studies revealed significant distortion of B-form DNA upon binding. Our so-called 'octamer' represents, to the best of our knowledge, the first intercalator that binds as an octakis-intercalator, capable of spanning at least 16 base pairs of DNA. (C) 2001 Elsevier Science Ltd. All rights reserved.
作者:R. Scott Lokey、Yan Kwok、Vladimir Guelev、Christopher J. Pursell、Laurence H. Hurley、Brent L. Iverson
DOI:10.1021/ja9706108
日期:1997.8.1
We have synthesized a series of polyintercalating compounds, including the first known tetraintercalator, based on the 1,4,5,8-naphthalenetetracarboxylic diimide chromophore. The chromophores are attached in a head-to-tail arrangement by peptide linkers and are synthesized by standard solid phase peptide synthesis methods. We report evidence, based on UV-visible spectroscopy and viscometry, that the compounds are fully intercalated upon binding to double-stranded DNA. Using DNAse I footprinting experiments, the bisintercalator 2 was found to bind to DNA in a cooperative manner. The footprinting results as well as association and dissociation kinetics data reveal that the compounds exhibit a tremendous preference for GC over AT sequences. A. mode of binding is proposed in which the compounds intercalate completely from the major groove, and not in a threading manner as may be suggested by their structures. A kinetic scheme is proposed that takes into account the observed cooperativity and fits the data for the dissociations of the polyintercalators from poly(dAdT), although a similar scheme could not adequately model their dissociations from poly(dGdC) or from calf thymus DNA.
An octakis-intercalating molecule
作者:M Murr
DOI:10.1016/s0968-0896(00)00335-7
日期:2001.5
Herein we report the synthesis and characterization of a polyintercalator with eight potential intercalating 1,4,5,8-naphthalenetetracarboxylic diimide (NDI) units linked in a head-to-tail arrangement via a peptide linker. W spectroscopy and viscometry measurements indicated the molecule binds to double-stranded DNA with all eight NDI units intercalated simultaneously. Competition dialysis and DNAse 1 footprinting studies revealed a preference for GC-rich regions of DNA, and circular dichroism studies revealed significant distortion of B-form DNA upon binding. Our so-called 'octamer' represents, to the best of our knowledge, the first intercalator that binds as an octakis-intercalator, capable of spanning at least 16 base pairs of DNA. (C) 2001 Elsevier Science Ltd. All rights reserved.