Chevillet, John Richard (2002) Targeting repeat sequences with DNA-binding small molecules. Master's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechTHESIS:02022012-110126423
Recognition of repeat sequences in DNA would have applications in molecular biology. One of the most biologically interesting repeat sequences is the telomeric repeat which composes the ends of eukaryotic chromosomes; in vertebrates 5'-TTAGGG-3'. This sequence has been used as a model to study how DNA-binding polyamide molecules composed of pyrrole (Py) and imidazole (Im) residues bind to repeating sequences. DNase I footprinting shows that the polyamide-fluorophore conjugate IrnImImPy-γ-PyPy((CH_2)_3N,N',N''trimethylbis hexamethylene)triamineOregonGreen488) PyPy-β-Me can bind the sequence 5'-AGGGTT-3' K_a = 1.8x10^8 M^(-1). Quantitative fluorescence titrations with varying patterns of telomeric repeat suggest that the molecule can tolerate another polyamide binding contiguously, but not two. Truncation of the tail of the conjugate to yield the molecule ImImImPy-γ-Py Py((CH_2)_3N,N',N''trimethylbis (hexamethylene)triamine-OregonGreen488) PyPy-Me allows the compound to bind three contiguous sites, suggesting that steric polyamide-polyamide interactions control binding in this manner.
|Item Type:||Thesis (Master's thesis)|
|Degree Grantor:||California Institute of Technology|
|Division:||Chemistry and Chemical Engineering|
|Thesis Availability:||Restricted to Caltech community only|
|Defense Date:||1 January 2002|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Benjamin Perez|
|Deposited On:||03 Feb 2012 15:59|
|Last Modified:||26 Dec 2012 04:40|
- Final Version
Restricted to Caltech community only
See Usage Policy.
Repository Staff Only: item control page