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In this study, we have followed the fate of newly synthesized alpha- and beta-subunits of Na,K-ATPase in Xenopus oocytes injected with alpha and/or beta cRNA to examine whether assembly of the two subunits is needed for a correct folding and/or for intracellular transport of Na,K-ATPase. Our data indicate that (1) assembly of alpha- and beta-subunits occurs at the level of the ER, (2) beta-subunits are needed for the newly synthesized alpha-subunit to adopt a stable configuration and (3) alpha- and beta-subunits mutually depend on each other to be transported out of the ER.
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Ackermann et al. (1990) studied this question.
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