Nitrogen K-edge soft X-ray natural circular dichroism of histidine thin film

1st Conference on Light and Particle Beams in Materials Science 2013

物理学;材料科学

Izumi, Yudai^1 ; Tanaka, Masahito^2 ; Tanigawa, Yoshiaki^3 ; Tanabe, Maiko^3 ; Momoki, Yohei^3 ; Iwai, Miki^4 ; Takenaka, Shun^4 ; Ishiyama, Kimihiro^4 ; Kuroki, Misa^4 ; Muro, Takayuki^5 ; Nakagawa, Kazumichi^3,4

Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki, Japan^1

Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan^2

Graduate School of Human Development and Environment, Kobe University, Hyogo, Japan^3

Faculty of Human Development, Kobe University, Hyogo, Japan^4

Japan Synchrotron Radiation Research Institute, Hyogo, Japan^5

关键词: Asymmetric carbons;    Atoms in Molecules;    Local structure;    Natural circular dichroisms;    Nitrogen atom;    Nitrogen K-edge;    Protein structures;    Soft X-ray regions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/502/1/012038/pdf
DOI  :  10.1088/1742-6596/502/1/012038

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We report preliminary natural circular dichroism (NCD) spectra of amino acids, Land D-histidine, thin films in the nitrogen K-edge energy region. NCD peaks were observed at 399.9 eV and were assigned to the 1s-π* transition of the nitrogen atoms in imidazole ring. Imidazole ring is positioned at the side chain distant from the asymmetric carbon. This result suggests that NCD spectroscopy in the soft X-ray region can selectively pick up the information on local structure around specific atoms, regardless of the position of atoms in molecules. It is interesting in view of application of NCD spectroscopy in the soft X-ray region to investigation of protein structures.