SGD Paper 
Lyman SK and Schekman R (1997) Binding of secretory precursor polypeptides to a translocon subcomplex is regulated by BiP. Cell 88(1):85-96
Abstract: The translocation of a secretory precursor protein across the ER membrane comprises three phases: docking of the precursor at the membrane, insertion into the translocation pore, and exit from the pore into the ER lumen. We demonstrate that Sec62p, Sec71p and Sec72p form a translocon subcomplex that engages secretory precursors at the membrane site of the ER translocation machinery. Binding of a precursor to the subcomplex depends on the presence of an intact signal sequence and occurs only in the absence of ATP. In the presence of ATP, the precursor is released from the subcomplex in a reaction mediated by the lumenal hsp70, BiP. This release reaction, which is specific to BiP and requires interaction between BiP and the DnaJ homolog Sec63p, defines a role for BiP and Sec63p early in the ER translocation process.
| Status: Published | Type: Journal Article | PubMed ID: 9019409 |
Topics addressed in this paper
Number of different genes curated to this paper: 5
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