X-ray absorption near-edge structure study on the configuration of Cu2+/histidine complexes at different pH values

doi:10.1088/1674-1056/25/4/048701

Abstract The local configurations around metal ions in metalloproteins are of great significance for understanding their biological functions. Cu²⁺/histidine (His) is a typical complex existing in many metalloproteins and plays an important role in lots of physiological functions. The three-dimensional (3D) structural configurations of Cu²⁺/His complexes at different pH values (2.5, 6.5, and 8.5) are quantitatively determined by x-ray absorption near-edge structure (XANES). Generally Cu²⁺/His complex keeps an octahedral configuration consisting of oxygen atoms from water molecules and oxygen or nitrogen atoms from histidine molecules coordinated around Cu²⁺. It is proved in this work that the oxygen atoms from water molecules, when increasing the pH value from acid to basic value, are gradually substituted by the O_carboxyl, N_am, and N_im from hisitidine molecules. Furthermore, the symmetries of Cu²⁺/His complexes at pH 6.5 and pH 8.5 are found to be lower than at pH 2.5.

Keywords: x-ray absorption near-edge structure Cu²⁺/His pH values configuration

Received: 13 November 2015
Revised: 14 December 2015
Accepted manuscript online:

PACS:	87.64.kd	(X-ray and EXAFS)
	61.05.cj	(X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11205186).

Corresponding Authors: Mei-Juan Yu
E-mail: yumj@ihep.ac.cn

Cite this article:

Mei-Juan Yu(于梅娟), Yu Wang(王宇), Wei Xu(徐伟) X-ray absorption near-edge structure study on the configuration of Cu²⁺/histidine complexes at different pH values 2016 Chin. Phys. B 25 048701

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X-ray absorption near-edge structure study on the configuration of Cu2+/histidine complexes at different pH values

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X-ray absorption near-edge structure study on the configuration of Cu²⁺/histidine complexes at different pH values