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• W2013541294 abstract "Metallothioneins (MTs) are low molecular weight, stress-activated proteins that protect cells against heavy metals, oxidants, and some electrophilic drugs. Both nuclear and cytoplasmic MT phenotypes have been observed in cells even though MTs (6 kDa) are well below the size exclusion limit for diffusion through the nuclear envelope. To study the factors controlling MT subcellular partitioning, we covalently linked MTII to a fluorescent label and examined its subcellular distribution in response both to pharmacologic and physical perturbations. Fluorescent MTII localized to the nucleus of digitonin-permeabilized human SCC25 carcinoma cells, consistent with its endogenous distribution in these cells. Nuclear sequestration of the fluorescent MTII was inhibited by a 100-fold molar excess of unlabeled MTII and by wheat germ agglutinin, indicating a saturable binding mechanism and the involvement of one or more glycoproteins, respectively. Depletion of adenosine triphosphate (ATP) inhibited MTII nuclear localization, implying energy-dependent nuclear translocation or retention of MT. Neither chilling nor the absence of cytosolic extracts inhibited nuclear sequestration of MTII, supporting diffusion-based entry mechanism. In situ biochemical extractions of the nuclear MTII revealed at least two distinct binding activities. Collectively, these data indicate that MTII diffuses into the nucleus of SCC25 cells, where it is selectively and actively retained by nuclear binding factors, imparting its localization phenotype. J. Cell. Physiol. 182:69–76, 2000. © 2000 Wiley-Liss, Inc." @default.
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• W2013541294 date "2000-01-01" @default.
• W2013541294 modified "2023-09-27" @default.
• W2013541294 title "Energy-dependent nuclear binding dictates metallothionein localization" @default.
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• W2013541294 doi "https://doi.org/10.1002/(sici)1097-4652(200001)182:1<69::aid-jcp8>3.0.co;2-9" @default.
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