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Research Article |
1 Biozentrum, University of Basel, CH-4056 Basel, Switzerland
2 Department of Morphology, University of Geneva School of Medicine, CH-1211
Geneva, Switzerland
3 Tokyo University of Pharmacy and Life Science, 192-0392 Tokyo, Japan
Author for correspondence (e-mail: Hans-Peter.Hauri{at}unibas.ch)
Accepted 27 October 2001
Export of membrane proteins from the ER is believed to be selective and require transport signals, but the identity of such signals has remained elusive. The recycling type I membrane protein ERGIC-53 carries a C-terminal diphenylalanine motif that is required for efficient ER export. Here we show that this motif can be functionally substituted by a single phenylalanine or tyrosine at position -2, two leucines or isoleucines at position -1 and -2 or a single valine at position -1. These motifs are common among mammalian type I membrane proteins. A single C-terminal valine, but none of the other motifs, accelerates transport of inefficiently exported reporter constructs and hence operates as an export signal. The valine signal is position, but not context, dependent. All transport motifs mediate COPII binding in vitro with distinct preferences for the COPII subunits Sec23p, Sec24Bp, Sec24Cp and p125. These results suggest that cytoplasmic C-terminal amino-acid motifs, either alone or in conjunction with other transport determinants, accelerate ER export of numerous type I and probably polytopic membrane proteins by mediating interaction with COPII coat components.
Key words: COPII, endoplasmic reticulum, ERGIC-53, transport signal, C-terminal valine
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