Enzymatic synthesis of 18O(6)-guanosine and spectroscopic characterization of Hoogsteen and reverse Hoogsteen hydrogen-bonded guanosine structures

Article Abstract:

Research was conducted to examine the vibrational spectra of Hoogsteen and reverse Hoogsteen hydrogen-bonded guanosine structures. Adenylic acid deaminase was used to convert Cl(6)-guanosine to 18O(6)-guanosine in the presence of H(sub 2)(super 18)O. The assignment of the carbonyl vibrations in guanosine tetramer was allowed through observations of infrared and Raman spectra of both guanosine and 18O(6)-guanosine. Vibrational frequency computations show that no normal mode is associated with a single C=O group vibration.

Usage, Hydrogen bonds, Vibrational spectra, Adenylic acid, Adenosine monophosphate, Guanosine

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Spectroscopic characterization of the G*G.C triplet in triple helix structures

Article Abstract:

Intramolecular triple helices are obtained by twice folding back oligonucleotides formed by decamers bound by nonnucleotide linkers, thus two triple helices are prepared with forced third strand orientation, respectively parallel and antiparallel with respect to the guanosine strand of the Watson-Crick duplex. The stability of the parallel triplex is found to be lower than that of the antiparallel, and the sugar conformations determined by infrared spectroscopy are different for both triplexes.

DNA microarrays

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Solvatochromism of the excitation and emission spectra of 7-aminoactinomycin D: Implications for drug recognition of DNA secondary structures

Article Abstract:

Solvatochromism techniques are used to understand the environmental contribution to the fluorescence properties of the bound drug, whereby 7-aminoactinomycin D fluorescence properties are determined in 20 solvents with known polarization (pi), hydrogen bond donor (alpha), and hydrogen bond acceptor (beta) properties.

Electric properties, Amino acids, Dactinomycin, Actinomycin-D

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