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Export of antigenic peptides from the endoplasmic reticulum intersects with retrograde protein translocation through the Sec61p channel.

Abstract：

:Antigenic peptides are translocated by the TAP peptide transporter from the cytosol into the endoplasmic reticulum (ER) for loading onto MHC class I molecules. Peptides that fail to bind need to be removed from the ER. Here we provide evidence that peptide export utilizes the Sec61p translocon as demonstrated by blocking this channel with bacterial exotoxin. Peptide export interferes with the retrotranslocation of beta2-microglobulin from the ER to the cytosol, suggesting similar pathways for the disposal of proteins and oligopeptides. Peptide export requires ATP supply to the ER lumen but is independent of ATP hydrolysis.

journal_name

Immunity

journal_title

Immunity

authors

Koopmann JO,Albring J,Hüter E,Bulbuc N,Spee P,Neefjes J,Hämmerling GJ,Momburg F

doi

10.1016/s1074-7613(00)00013-3

keywords:

subject

Has Abstract

pub_date

2000-07-01 00:00:00

pages

117-27

issue

1

eissn

1074-7613

issn

1097-4180

pii

S1074-7613(00)00013-3

journal_volume

13

pub_type

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