Metal-binding and redox properties of substituted linear and cyclic ATCUN motifs.
Metal-binding and redox properties of substituted linear and cyclic ATCUN motifs.
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取代的线性和环状 ATCUN 基序的金属结合和氧化还原特性。
DOI:
10.1016/j.jinorgbio.2014.06.004
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发表时间:
2014
影响因子:
3.9
通讯作者:
Kritzer,JoshuaA
中科院分区:
文献类型:
--
作者:
Neupane,KoshP;Aldous,AmandaR;Kritzer,JoshuaA
The amino-terminal copper and nickel binding (ATCUN) motif is a short peptide sequence found in human serum albumin and other proteins. Synthetic ATCUN–metal complexes have been used to oxidatively cleave proteins and DNA, cross-link proteins, and damage cancer cells. The ATCUN motif consists of a tripeptide that coordinates Cu(II) and Ni(II) ions in a square planar geometry, anchored by chelation sites at the N-terminal amine, histidine imidazole and two backbone amides. Many studies have shown that the histidine is required for tight binding and square planar geometry. Previously, we showed that macrocyclization of the ATCUN motif can lead to high-affinity binding with altered metal ion selectivity and enhanced Cu(II)/Cu(III) redox cycling (Inorg.Chem.2013,52, 2729–2735). In this work, we synthesize and characterize several linear and cyclic ATCUN variants to explore how substitutions at the histidine alter the metal-binding and catalytic properties. UV–visible spectroscopy, EPR spectroscopy and mass spectrometry indicate that cyclization can promote the formation of ATCUN-like complexes even in the absence of imidazole. We also report several novel ATCUN-like complexes and quantify their redox properties. These findings further demonstrate the effects of conformational constraints on short, metal-binding peptides, and also provide novel redox-active metallopeptides suitable for testing as catalysts for stereoselective or regioselective oxidation reactions.
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影响因子:
2.1
作者:
J. Azéma;C. Galaup;C. Picard;P. Tisnés;Patricia Ramos;O. Juanes;J. Rodríguez;E. Brunet
通讯作者:
E. Brunet
影响因子:
1.6
作者:
R. Singh;N. Sharma;R. Prasad;U. Singh
通讯作者:
U. Singh
影响因子:
2.6
作者:
Brasun, Justyna;Matera-Witkiewicz, Agnieszka;Oldziej, Stanislaw
通讯作者:
Oldziej, Stanislaw
DOI:
10.1039/a703065g
发表时间:
1997-10-07
期刊:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
影响因子:
--
作者:
Aime, S;Batsanov, AS;Williams, JAG
通讯作者:
Williams, JAG
影响因子:
2.8
作者:
K. Várnagy;B. Bóka;I. Sóvágó;D. Sanna;P. Marras;G. Micera
通讯作者:
G. Micera