期刊
BIOCHEMISTRY
卷 56, 期 24, 页码 3129-3141出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.biochem.7b00293
关键词
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资金
- Canadian Institutes of Health Research
- Saskatchewan Health Research Foundation
- Telus Ride for Dad funding
- Natural Sciences and Engineering Research Council of Canada
- Saskatchewan Innovation and Science Fund
- Alexander Graham Bell Canada Graduate Scholarship (NSERC)
- NSF [ACI-1339844]
- Direct For Computer & Info Scie & Enginr
- Office of Advanced Cyberinfrastructure (OAC) [1339844, 1615114] Funding Source: National Science Foundation
Copper is an essential nutrient required for many biological processes involved in primary metabolism, but free copper is toxic due to its ability to catalyze formation of free radicals. To prevent toxic effects, in the cell copper is bound to proteins and low molecular weight compounds, such as glutathione, at all times. The widely used chemotherapy agent cisplatin is known to- bind to copper-transporting proteins, including copper. chaperone Atoxl. Cisplatin interactions with Atoxl and other copper transporters are linked to cancer resistance to platinum-based chemotherapy. Here we analyze the binding of copper and cisplatin to Atox1 in the presence of glutathione under redox conditions that mimic intracellular environment. We show that copper(I) and glutathione form large polymers with a molecular mass of approximately 8 kDa, which can transfer copper to Atoxl. Cisplatin also can form polymers with glutathione, albeit at a slower rate. Analysis of simultaneous binding of copper and cisplatin to Atox1 under physiological conditions shows that both metals are bound to the protein through copper-sulfur:platinum bridges.
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