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. 1995 Apr 2;129(2):309–319. doi: 10.1083/jcb.129.2.309

The capacity to retrieve escaped ER proteins extends to the trans-most cisterna of the Golgi stack

PMCID: PMC2199920  PMID: 7721936

Abstract

To explore how far into the Golgi stack the capacity to retrieve KDEL proteins extends, we have introduced an exogenous probe (the peptide YHPNSTCSEKDEL) into the TGN of living cells. For this purpose, a CHO cell line expressing a c-myc-tagged version of the transmembrane protein TGN38--which cycles between the TGN and the cell surface--was generated. The cells internalized peptides that were disulfide bonded to anti-myc antibodies and accumulated the peptide-antibody complexes in the TGN. Peptides released from these complexes underwent retrograde transport to the ER, as evidenced by the transfer of N-linked carbohydrate to their acceptor site. The KDEL-tagged glycopeptides (approximately 10% of the endocytosed load) behaved like endogenous ER residents: they stayed intracellular, and their oligosaccharide side chains remained sensitive to endoglycosidase H. An option thus exists to extract ER residents even at the most distant pole of the Golgi stack, suggesting that sorting of resident from exported ER proteins may occur in a multistage process akin to fractional distillation.

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Selected References

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