Title
Design of polyelectrolyte core-shells with DNA to control TMPyP binding
Author
Vanda Vaz Serra, Raquel Teixeira, Suzana M. Andrade, Sílvia M.B. Costa
Year
2016
Journal
Colloids and Sufaces B: Biointerfaces
Abstract
The interaction of DNA with 5,10,15,20-tetrakis(4-N-methylpyridiniumyl)porphyrin (TMPyP) in polyelectrolyte core-shells obtained via layer by layer adsorption of poly(sodium 4-styrenesulfonate), PSS, and poly(allylamine hydrochloride), PAH, polyelectrolytes was followed by steady state, time resolved spectroscopy and by Fluorescence Lifetime Imaging Microscopy (FLIM). Our results show that DNA adsorption onto polyelectrolyte core-shell changes the TMPyP interaction within PSS/PAH core-shells structure and increase significantly the TMPyP uptake. Specific DNA/TMPyP interactions are also altered by DNA adsorption favouring porphyrin intercalation onto GC pair rich regions. Circular dichroism (CD) spectra reveal that DNA undergoes important conformational changes upon adsorption onto the core-shell surface, which are reverted upon TMPyP encapsulation.
Instrument
J-720
Keywords
Circular dichroism, DNA structure, Materials, Biochemistry