Interactions of Rare Earth Ions with Bovine Blood Cu(Zn)-Superoxide Dismutase

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (7): 993.

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Interactions of Rare Earth Ions with Bovine Blood Cu(Zn)-Superoxide Dismutase

FENG Zhi-Xiang¹, ZHANG Shu-Gong¹, LIU Qi-Min¹, YANG Kui-Yue¹, NI Jia-Zuan¹, MIAO Jian², YOU Shu-Heng²

1. Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Chanchun, 130022;
2. Department of Biochemistry, Henan Medical University, Zhengzhou

Received:1994-08-24 Revised:1994-11-25 Online:1995-07-24 Published:1995-07-24

Abstract

Abstract: The interactions of lanthanium trichloride and terbium trichloride with bovine blood Cu (Zn)-superoxide dismutase [Cu(Zn)-SOD] in the aqueous solution of hexam-ethylenetetramine buffer (pH=6. 3) have been'studied by using fluorescece, CDand ESRspectra. The results indicated that rare earth ions were coordinated to the carboxyl groups of acidic amino acid residues which were far from active center of the Cu(Zn)-SOD molecule and only lightly disturbed the secondary structure of the enzyme protien, and made the coordination structure of enzyme-bound Cu²⁺come from the rhombchedron to the axial shape at 77 K and the activity of Cu(Zn)-SOD enzyme was not nearly changed at room temperature.

Key words: Rare earth, Cu(Zn)-SOD, ESR, CD spectra, Fluorescence spectra

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FENG Zhi-Xiang, ZHANG Shu-Gong, LIU Qi-Min, YANG Kui-Yue, NI Jia-Zuan, MIAO Jian, YOU Shu-Heng. Interactions of Rare Earth Ions with Bovine Blood Cu(Zn)-Superoxide Dismutase[J]. Chem. J. Chinese Universities, 1995, 16(7): 993.

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Interactions of Rare Earth Ions with Bovine Blood Cu(Zn)-Superoxide Dismutase

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