Author/Authors :
Shimada، نويسنده , , Hiroyuki and Fukao، نويسنده , , Taishi and Minami، نويسنده , , Hirotake and Ukai، نويسنده , , Masatoshi and Fujii، نويسنده , , Kentaro and Yokoya، نويسنده , , Akinari and Fukuda، نويسنده , , Yoshihiro and Saitoh، نويسنده , , Yuji، نويسنده ,
Abstract :
X-ray absorption near edge structure (XANES) spectra for adenine-containing nucleotides, adenosine 5′-monophosphate (AMP) and adenosine 5′-triphosphate (ATP) in aqueous solutions at the nitrogen K-edge region were measured. The two intense peaks in XANES spectra are assigned to transitions of 1s electrons to the π∗ orbitals of different types of N atoms with particular bonding characteristics. The difference between their spectra is ascribed to protonation of a particular N atom. Similarity observed in XANES spectra of guanosine 5′-monophosphate (GMP) and ATP is also interpreted as similar bonding characters of the N atoms in the nucleobase moiety.
