Electron spin-lattice relaxation of the [Cu(1.5) ... Cu(1.5)] dinuclear copper center in nitrous oxide reductase.
Electron spin-lattice relaxation of the [Cu(1.5) ... Cu(1.5)] dinuclear copper center in nitrous oxide reductase.
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一氧化二氮还原酶中 [Cu(1.5) ... Cu(1.5)] 双核铜中心的电子自旋晶格弛豫。
DOI:
10.1016/s0006-3495(95)80149-9
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发表时间:
1995
影响因子:
3.4
通讯作者:
Zumft,WG
中科院分区:
文献类型:
--
作者:
Pfenninger,S;Antholine,WE;Barr,ME;Hyde,JS;Kroneck,PM;Zumft,WG
Relaxation times have been obtained with time-domain EPR for the dinuclear mixed valence [CuA(1.5) ... CuA(1.5)[ S=1/2 center in nitrous oxide reductase, N2OR, from Pseudomonas stutzeri, in the TN5 mutant defective in copper chromophore biosynthesis, in a synthetic mixed valence complex, and in type 1 and 2 copper complexes. Data confirmed that the intrinsic electron spin-lattice relaxation time, T1, for N2OR in the temperature range of 6–25 K is unusually short for copper centers. At best, a twofold increase of T1 from g perpendicular to g parallel was measured. Optimized fits of the saturation-recovery data were obtained using both double-exponential and stretched-exponential functions. The temperature dependence of the spin-lattice relaxation rate of mutant N2OR is about T5.0 with the stretched-exponential model or T3.3 and T3.9 for the model using the sum of two exponentials. These T1s are intrinsic to the mixed valence [CuA(1.5) ... CuA(1.5)] center, and no interaction of the second copper center in wild-type N2OR with the [CuA(1.5) ... CuA(1.5)] center has been observed. The T1 of the mixed valence center of N2OR is not only shorter than for monomeric square planar Cu(II) complexes, but also shorter than for a synthetic mixed valence complex, Cu2(N[CH2CH2NHCH2CH2NHCH2CH2]3N). The short T1 is attributed to the vibrational modes of type 1 copper and/or the metal-metal interaction in [CuA(1.5) ... CuA(1.5)].
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DOI:
10.1111/j.1432-1033.1993.tb18369.x
发表时间:
1993
期刊:
European journal of biochemistry
影响因子:
--
作者:
VandeKamp,M;Canters,GW;Andrew,CR;Sanders-Loehr,J;Bender,CJ;Peisach,J
通讯作者:
Peisach,J
影响因子:
2.2
作者:
P. Kroneck;W. Antholine;H. Koteich;D. Kastrau;F. Neese;W. Zumft
通讯作者:
W. Zumft
影响因子:
2.2
作者:
C. Abreu;N. Pinhal;N. V. Vugman
通讯作者:
N. V. Vugman
DOI:
10.1111/j.1432-1033.1990.tb19265.x
发表时间:
1990-09
期刊:
European journal of biochemistry
影响因子:
--
作者:
W. Zumft;Adelheid Viebrock-Sambale;C. Braun
通讯作者:
W. Zumft;Adelheid Viebrock-Sambale;C. Braun
DOI:
10.1039/f19878303693
发表时间:
1987
期刊:
Journal of the Chemical Society, Faraday Transactions
影响因子:
--
作者:
M. Bacci;S. Cannistraro
通讯作者:
S. Cannistraro