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Volumn 284, Issue 5415, 1999, Pages 805-808

Undetectable intracellular free copper: The requirement of a copper chaperone for superoxide dismutase

Author keywords

[No Author keywords available]

Indexed keywords

CHAPERONE; COPPER; METAL; METALLOPROTEIN; SCAVENGER; SUPEROXIDE DISMUTASE;

EID: 0033617578     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.284.5415.805     Document Type: Article
Times cited : (1453)

References (35)
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    • note
    • Milli-Q water was treated with Chelex 100 (Bio-Rad) to remove trace metals. Yeast cells were dried overnight at 75° to 80 °C until no further change in mass was observed, dissolved in concentrated nitric acid (300 to 500 μl), and heated at 80 °C for 30 min. Parallel control experiments examined background amounts of copper in the materials used. Elemental analysis of hydrolyzed cells was measured by inductively coupled plasma-atomic emission spectroscopy (AtomScan ICP-AES).
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    • 4 molecules per cell, respectively.
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    • 6 complex for 2 hours. Cu(I)-yCCS was then washed with repeated dialysis with the same tris/DTT/NaCl buffer, followed by dialysis exchanges against 50 mM tris (pH 8.0) alone to remove DTT and NaCl. All stages of the Cu(I)-yCCS complexation procedure were performed in an anaerobic glove box. Copper analysis by ICP-AES and calibrated Bradford protein assay revealed a 1.1:1 Cu(I)-yCCS complex.
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    • 3CN, and 0.1% trifluoroacetic acid, followed by further purification by reverse-phase high-performance liquid chromatography through a C4 Vydac 214TP54 column. The ySOD1 protein fractions were combined, dried under vacuum, and applied directly to the in vitro activation assays described below. A mass of 15,722.5 daltons determined by ESI-MS confirmed the identity of the purified ySOD1 monomer (theoretical mass of 15,723 daltons). Holo-ySOD1 for positive controls was isolated from baker's yeast cake by the chloroform-ethanol extraction procedure as described (29).
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    • 6 and 0 or 200 μM BCS. The standard cytochrome c-xanthine oxidase assay for SOD activity (17) was executed in triplicate for each reaction mixture, and 1 mM EDTA was included in the assay buffer. SOD activity staining of native polyacrylamide gel electrophoresis (PAGE) gels with NBT was done as described (28). Native PAGE of in vitro activation mixtures contained 0.1 mM EDTA in the running buffer.
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    • note
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    • note
    • We thank D. Hamer for yeast strain 19.3C; J. Valentine for the ySOD1-pET3d plasmid; D. Kosman for yeast SOD1 antibody; I. Klotz, J. Widom, and D. Huffman for advice; and J. Strain, A. Torres, and A. Hermreiter for technical assistance. Supported in part by NIH grants GM 54111 (T.V.O.), GM 50016 (V.C.C.). F32 GM19457 (T.D.R.), and F32 DK09305 (R.A.P.); National Institute of Environmental Health Science training grant ES07141 (P.J.S.); the Johns Hopkins University National Institute for Environmental Health Science Center (V.C.C.); and the Amyotrophic Lateral Sclerosis Association (T.V.O.). T.V.O is a member of the Robert H. Lurie Comprehensive Cancer Center.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.