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Photochemical selectivity in guanine-cytosine base-pair structures

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    0020908 - ÚOCHB 2006 RIV US eng J - Journal Article
    Abo-Riziq, A. - Grace, L. - Nir, E. - Kabeláč, Martin - Hobza, Pavel - Vries de, M. S.
    Photochemical selectivity in guanine-cytosine base-pair structures.
    [Photochemická selektivita v páru bazí guanin-cytosine.]
    Proceedings of the National Academy of Sciences of the United States of America. Roč. 102, č. 1 (2005), s. 20-23. ISSN 0027-8424. E-ISSN 1091-6490
    R&D Projects: GA ČR(CZ) GA203/05/0009
    Grant - others:NSF(US) CHE-0244341
    Institutional research plan: CEZ:AV0Z40550506
    Keywords : DNA base pairs * IR-UV spectroscopy * phytochemistry
    Subject RIV: CF - Physical ; Theoretical Chemistry
    Impact factor: 10.231, year: 2005

    To investigate the role of UV irradiation in base-pairing we have studied guanine (G) and cytosine(C) base pairs. We distinguished base-pair structures by IR-UV hole-burning spectroscopy as well as by high-level correlated ab initio calculations. The Watson-Crick structure exhibits broad UV absorption, in stark contrast to other GC structures and other base-pair structures. This broad absorption may be explained by a rapid internal conversion that makes this specific base pair arrangement uniquely photochemically stable.

    Spektroskopické vlastnosti páru bazí guanin-cytosin byly studovány pomocí experimentálních (IČ a UV spektroskopie) a teoretických (přesné korelované kvantově-chemické výpočty) metod. Watson-Crickovská struktura tohoto páru bází vykazuje narozdíl od ostatních struktur tohoto páru širokou specifickou UV absorbci, která může být vysvětlena velmi rychlou vnitřní konverzí.
    Permanent Link: http://hdl.handle.net/11104/0109954

     
     
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