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X-ray absorption spectra near the nitrogen K-edge for nucleotides in water solutions

窒素K吸収端付近における水溶液ヌクレオチド試料に対するX線吸収スペクトル

鵜飼 正敏*; 藤井 健太郎; 斎藤 祐児  ; 横谷 明徳

Ukai, Masatoshi*; Fujii, Kentaro; Saito, Yuji; Yokoya, Akinari

The conformational structure of a DNA molecule determined by the "hydration network" in water is of great importance to understand the molecular function of DNA in a living cell. In order to substantiate the stable and/or dynamical hydrated structure of DNA from the view point of the electronic properties, we develop a new spectroscopy for the photoelectrons ejected from solutions dissolving biological molecules using a soft X-ray synchrotron radiation in combination with liquid jet technique in vacuum. We present the first evidence of the spectrum of total photoelectron yields for nucleotides (AMP, GMP, and CMP) in solution in the energy region of so-called water window around nitrogen K-edge, which correspond to the X-ray absorption spectra of nucleotides in solution. The spectrum shares some characteristic features with that for solid. Nitrogen atoms only exist in the base site, so that the spectral similarities can be explained by the hydrophobic property of the base site.

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