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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The (Na+ + K+)-ATPase of chick sensory neurons. Studies on biosynthesis and intracellular transport.

The (Na+ + K+)-ATPase of cultured chick sensory neurons was studied with the aid of antibodies specific for this enzyme. Immunofluorescent labeling indicated the (Na+ + K+)-ATPase is evenly distributed on the neuronal cell surface; cell bodies, neurites, and growth cones were labeled with comparable intensity. Pulse-chase experiments with [35S]methionine, followed by immunoprecipitation, indicated concurrent synthesis and rapid association of the alpha (Mr = 105,000) and beta (Mr = 47,000) subunits. The alpha subunit is oligosaccharide-free while the beta subunit contains three Asn-linked oligosaccharide chains attached to a core peptide of 32,000 molecular weight. The time required for oligosaccharide processing of the newly synthesized beta subunit to endoglycosidase H-resistance suggests the (Na+ + K+)-ATPase takes 45-60 min to move from the site of polypeptide synthesis to the Golgi apparatus. Significantly less time was required for transport through the Golgi apparatus and insertion in the plasma membrane. From 30% to 55% of the newly synthesized (Na+ + K+)-ATPase did not appear on the cell surface but accumulated intracellularly. When tunicamycin was used to inhibit glycosylation of the beta subunit, there was no effect upon subunit assembly, intracellular transport, or degradation rate (t1/2 = 40 h).[1]


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