Lysine residues in the cytoplasmic region of TfR are involved in the MARCH8-induced downregulation of TfR. Lysine residues in the cytoplasmic region of.

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Presentation transcript:

Lysine residues in the cytoplasmic region of TfR are involved in the MARCH8-induced downregulation of TfR. Lysine residues in the cytoplasmic region of TfR are involved in the MARCH8-induced downregulation of TfR. (A,B) HeLa cells stably expressing myc–TfR (WT in A or 4KR mutant in B) were transfected with WT MARCH8–GFP and processed for IF analysis with anti-myc (red) and anti-cathepsin D (blue) antibodies. The images were obtained by confocal laser microscopy. The cells expressing WT MARCH8–GFP (green in Merge) are indicated by the yellow dotted lines. Scale bar: 20 µm. (C) The percentage of cells expressing myc–TfR (WT or 4KR mutant) in cells transfected with MARCH8–GFP. The number of cells examined was 394 for WT and 356 for 4KR. (D) The ubiquitination of myc-tagged TfRs (WT or 4KR mutant) in cells expressing MARCH8–GFP (WT or CS mutant) was examined. COS7 cells transfected with plasmids encoding myc-tagged TfRs (WT or 4KR mutant) and MARCH8–GFP (WT or CS mutant) for 24 hours were processed for IP with an anti-myc antibody followed by immunoblot analysis with a ubiquitin antibody. To confirm the expression of TfR and MARCH8 proteins, cell lysates were subjected to immunoblot analysis with anti-myc (middle panel) and anti-GFP (lower panel) antibodies, respectively. Hideaki Fujita et al. J Cell Sci 2013;126:2798-2809 © 2013. Published by The Company of Biologists Ltd