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Molecular and Cellular Biology, July 2000, p. 5096-5106, Vol. 20, No. 14
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
ATF6 as a Transcription Activator of the Endoplasmic
Reticulum Stress Element: Thapsigargin Stress-Induced Changes
and Synergistic Interactions with NF-Y and YY1
Mingqing
Li,
Peter
Baumeister,
Binayak
Roy,
Trevor
Phan,
Dolly
Foti,
Shengzhan
Luo, and
Amy S.
Lee*
Department of Biochemistry and Molecular
Biology, and the USC/Norris Comprehensive Cancer Center, Keck School of
Medicine of the University of Southern California, Los Angeles,
California 90089-9176
Received 11 February 2000/Returned for modification 10 March
2000/Accepted 22 March 2000
ATF6, a member of the leucine zipper protein family, can
constitutively induce the promoter of glucose-regulated protein
(grp) genes through activation of the endoplasmic reticulum
(ER) stress element (ERSE). To understand the mechanism of
grp78 induction by ATF6 in cells subjected to ER calcium
depletion stress mediated by thapsigargin (Tg) treatment, we discovered
that ATF6 itself undergoes Tg stress-induced changes. In nonstressed
cells, ATF6, which contains a putative short transmembrane domain, is
primarily associated with the perinuclear region. Upon Tg stress, the
ATF6 protein level dropped initially but quickly recovered with the additional appearance of a faster-migrating form. This new form of ATF6
was recovered as soluble nuclear protein by biochemical fractionation,
correlating with enhanced nuclear localization of ATF6 as revealed by
immunofluorescence. Optimal ATF6 stimulation requires at least two
copies of the ERSE and the integrity of the tripartite structure of the
ERSE. Of primary importance is a functional NF-Y complex and a
high-affinity NF-Y binding site that confers selectivity among
different ERSEs for ATF6 inducibility. In addition, we showed that YY1
interacts with ATF6 and in Tg-treated cells can enhance ATF6 activity.
The ERSE stimulatory activity of ATF6 exhibits properties distinct from
those of human Ire1p, an upstream regulator of the mammalian unfolded
protein response. The requirement for a high-affinity NF-Y site for
ATF6 but not human Ire1p activity suggests that they stimulate the ERSE
through diverse pathways.
*
Corresponding author. Mailing address: Department of
Biochemistry and Molecular Biology, USC/Norris Comprehensive Cancer
Center, Keck School of Medicine of the University of Southern
California, 1441 Eastlake Ave., Los Angeles, CA 90089-9176. Phone:
(323) 865-0507. Fax: (323) 865-0094. E-mail:
amylee{at}hsc.usc.edu.
Molecular and Cellular Biology, July 2000, p. 5096-5106, Vol. 20, No. 14
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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