Cellular proteins are degraded in either proteasomes or lysosomes depending on the types of ubiquitin chains that covalently modify them. It is not known whether the choice between these two pathways is physiologically regulated. The Lys48-polyubiquitin chain is the major signal directing proteins for degradation in proteasomes.
View Article and Find Full Text PDFAcute 96 h bioassays were conducted on coho salmon (Oncorhynchus kisutch) to determine their sensitivity to each of four toxicants during development. Alevins, swim-up fry and juveniles (up to 175 days post-hatch) were exposed to lethal concentrations of copper, zinc, nickel, or pentachlorophenol each week to monitor changes in susceptibility as the fish grew. Fish exhibited a high degree of susceptibility to all of the toxicants during the alevin stage.
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