Academic Journal
X-ray absorption near-edge structure study on the configuration of Cu 2+ /histidine complexes at different pH values.
| Title: | X-ray absorption near-edge structure study on the configuration of Cu 2+ /histidine complexes at different pH values. |
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| Authors: | Mei-Juan Yu, Yu Wang, Wei Xu |
| Source: | Chinese Physics B; Apr2016, Vol. 25 Issue 4, p1-1, 1p |
| 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 |
| Subject Terms: | METALLOPROTEINS, X-ray absorption, METAL ion absorption & adsorption, HISTIDINE, SYMMETRIES (Quantum mechanics), QUANTITATIVE research |
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| ISSN: | 16741056 |
| DOI: | 10.1088/1674-1056/25/4/048701 |
| Database: | Complementary Index |
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