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Phosphorylation of the human asialoglycoprotein receptor.


ABSTRACT: The human asialoglycoprotein receptor was isolated via immune precipitation from hepatoma Hep G2 cells following incubation with [32P]Pi. Analysis on sodium dodecyl sulphate/polyacrylamide-gel electrophoresis revealed incorporation of 32P into both the 46 000 Da mature form of the receptor as well as the 40 000 Da precursor. The incorporated 32P was associated with phosphoserine. The degree of 32P incorporation was not substantially altered in cells endocytosing asialoglycoprotein ligand at maximal rates nor in cells in which receptor recycling was abolished by incubation with primaquine. That endocytosis and phosphorylation can be dissociated is supported by the observation that 32P is incorporated from [gamma-32P]ATP into the asialoglycoprotein receptor in isolated plasma membranes of Hep G2 cells.

SUBMITTER: Schwartz AL 

PROVIDER: S-EPMC1144322 | biostudies-other | 1984 Oct

REPOSITORIES: biostudies-other

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