Characterization of proteins that associate with an unglycosylated form of the transferrin receptor in A431 cells.
A protein doublet (Mr = 135,000/130,000) was found to coprecipitate with an unglycosylated form of the transferrin receptor in tunicamycin-treated A431 cells. This doublet is not detected with either a monoclonal or polyclonal antibody to the transferrin receptor on Western blots indicating that these proteins do not interact directly with transferrin receptor antibody. Proteolytic digestion patterns of the individual proteins of the Mr = 135,000/130,000 doublet suggest that they are related to one another and are distinct from the transferrin receptor. Further characterization of these proteins indicates that they form a high molecular weight complex with the unglycosylated but not the glycosylated form of the transferrin receptor. Pulse-chase experiments demonstrate that the proteins post-translationally associate with the receptor.
Root
B J
BJ
Department of Biology, Syracuse University, New York 13244.
Reckhow
C L
CL
Clinton
E M
EM
Enns
C A
CA
D015153:Blotting, Western; D002460:Cell Line; D006031:Glycosylation; D006596:Hexosaminidases / Q000378:metabolism; D006801:Humans; D008970:Molecular Weight; D011506:Proteins / Q000378:metabolism*; D011990:Receptors, Transferrin / Q000378:metabolism*; D013997:Time Factors; D014415:Tunicamycin / Q000494:pharmacology
D011506:Proteins; D011990:Receptors, Transferrin; D014415:Tunicamycin; D006596:Hexosaminidases