Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 106, Issue 42, Pages 17775-17780Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0910342106
Keywords
regulated transport; unfolded protein response; BiP; prebudding complex
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Funding
- Howard Hughes Medical Institute Funding Source: Medline
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The transcription factor ATF6 is held as a membrane precursor in the endoplasmic reticulum ( ER), and is transported and proteolytically processed in the Golgi apparatus under conditions of unfolded protein response stress. We show that during stress, ATF6 forms an interaction with COPII, the protein complex required for vesicular traffic of cargo proteins from the ER. Using an in vitro budding reaction that recapitulates the ER-stress induced transport of ATF6, we show that no cytoplasmic proteins other than COPII are necessary for transport. ATF6 is retained in the ER by association with the chaperone BiP (GRP78). In the in vitro reaction, the ATF6-BiP complex disassembles when membranes are treated with reducing agent and ATP. A hybrid protein with the ATF6 cytoplasmic domain replaced by a constitutive sorting signal (Sec22b SNARE) retains stress-responsive transport in vivo and in vitro. These results suggest that unfolded proteins or an ER luminal - SH reactive bond controls BiP-ATF6 stability and access of ATF6 to the COPII budding machinery.
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