Triple helical polynucleotidic structures: sugar conformations determined by FTIR spectroscopy.
作者： J. Liquier , P. Coffinier , M. Firon , E. Taillandier
DOI: 10.1080/07391102.1991.10507927
关键词: Analytical chemistry 、 Crystallography 、 Absorption (chemistry) 、 Infrared spectroscopy 、 Spectral line 、 Chemistry 、 Double bond 、 Nucleic acid 、 Polynucleotide 、 Fourier transform infrared spectroscopy 、 Hydrogen bond
摘要: Fourier Transform Infrared Spectra of triple stranded polynucleotides containing homopurine dA or rA and homopyrimidine dT rU strands have been obtained in H2O D2O solutions as well hydrated films at various relative humidities. The spectra are interpreted by comparison with those double helixes identical base sugar composition. study the spectral domain corresponding to in-plane bond stretching vibrations bases shows that whatever initial duplex characterized a different IR spectrum (A family form poly rA.poly rU, heternomous dT, B dA.poly dT), triplexes present similar reflecting interactions. A particular attention is devoted 950-800 cm-1 region which contains marker bands conformation nucleic acids. In solution existence only N (C3'endo-A form) type pucker detected rU.poly dt.poly rU. On contrary absorption characteristic both S (C2'endo-B sugars for dT.poly dT. Finally mainly observed
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