標題: Mn,Cd-metallothionein-2: A room temperature magnetic protean
作者: Chang, CC
Lee, SF
Sun, KW
Ho, CC
Chen, YT
Chang, CH
Kan, LS
生物科技學系
應用化學系分子科學碩博班
物理研究所
Department of Biological Science and Technology
Institute of Molecular science
Institute of Physics
關鍵字: metallothionein;Zinc-Blende structure;magnetization;double exchange;hysteresis cycle;molecular magnet
公開日期: 24-Feb-2006
摘要: Naturally occurring metallothionein (MT) is a metal binding protein, which binds to seven Zn2+ through 20 conserved cysteines and forms two metal binding clusters with a Zinc-Blende structure. We demonstrate that the MT, when substituting the Zn2+ ions by Mn2+ and Cd2+, exhibits magnetic hysteresis loop observable by SQUID from 10 to 330 K. The magnetic moment may have originated from the bridging effect of the sulfur atoms between the metal ions that leads to the alignment of the electron spins of the Mn2+ ions inside the clusters. The protein backbone may restrain the net spin moment of Mn2+ ions from thermal fluctuation. The modified magnetic-metallothionein is a novel approach to creating molecular magnets with operating temperatures up to 330 K. (c) 2005 Elsevier Inc. All rights reserved.
URI: http://dx.doi.org/10.1016/j.bbrc.2005.12.117
http://hdl.handle.net/11536/12606
ISSN: 0006-291X
DOI: 10.1016/j.bbrc.2005.12.117
期刊: BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume: 340
Issue: 4
起始頁: 1134
結束頁: 1138
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