engleski

Assessment of human telomeric G-quadruplex structures using surface-enhanced Raman spectroscopy

G-quadruplex (G4) structures of a human telomeric 24-mer (5’-TTAGGGTTAGGGTTAGGGTTAGGG-3’) sequence (Tel24) stabilized by sodium and potassium ions have been assessed using surface-enhanced Raman scattering (SERS) spectroscopy. The distinctive SERS spectra of Tel24 in the presence of 100 mM Na+ and 100 mM K+ were obtained and the SERS bands characteristic of the anti-parallel basket-type and the mixed hybrid (3+1) structures, respectively, were identified and assigned. The influence of the SERS active substrate on the scattering enhancement was studied using citrate and chloride covered silver nanoparticles, in the absence and presence of the aggregating agent (0.1 M Na2SO4 and 0.1 M K2SO4). The highly reproducible SERS spectra of Tel24 obtained in various SERS active media indicated the same adsorption mechanism of the cation stabilized G-quadruplexes onto the metal surface, regardless of the silver colloid. The remarkable resemblance between the circular dichroism (CD) spectra of the Tel24 structures with and without the colloid, confirmed that interaction with the enhancing silver surface did not affect stability of the formed G4 structures. The presented study pointed to a great potential of the SERS spectroscopy for the sensitive structural analysis of various G4 topologies.

surface-enhanced Raman spectroscopy ; G-quadruplex ; human telomere ; silver colloid ; DNA structure

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