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Originally published In Press as doi:10.1074/jbc.M209386200 on October 22, 2002
J. Biol. Chem., Vol. 277, Issue 51, 49638-49643, December 20, 2002
The Anti-apoptotic Function of Hsp70 in the Interferon-inducible
Double-stranded RNA-dependent Protein Kinase-mediated Death
Signaling Pathway Requires the Fanconi Anemia Protein,
FANCC*
Qishen
Pang §,
Tracy A.
Christianson ,
Winifred
Keeble ,
Tara
Koretsky , and
Grover C.
Bagby §¶
From the OHSU Cancer Institute, Department of
Medicine and Molecular and Medical Genetics, Oregon Health and
Science University and § Veterans Affairs Medical Center,
Portland, Oregon 97201
Proteins encoded by five of the six known Fanconi
anemia (FA) genes form a heteromeric complex that facilitates repair of DNA damage induced by cross-linking agents. A certain number of these
proteins, notably FANCC, also function independently to modulate
apoptotic signaling, at least in part, by suppressing ground state
activation of the pro-apoptotic interferon-inducible double-stranded
RNA-dependent protein kinase (PKR). Because certain FANCC
mutations interdict its anti-apoptotic function without interfering
with the capacity of FANCC to participate functionally in the FA
multimeric complex, we suspected that FANCC enhances cell survival
independent of its participation in the complex. By investigating this
function in both mammalian cells and in yeast, an organism with no FA
orthologs, we show that FANCC inhibited the kinase activity of PKR both
in vivo and in vitro, and this effect depended
upon a physical interaction between FANCC and Hsp70 but not
on interactions of FANCC with other Fanconi proteins. Hsp70, FANCC, and
PKR form a ternary complex in lymphoblasts and in yeast expressing PKR.
We conclude that Hsp70 requires the cooperation of FANCC to suppress
PKR activity and support survival of hematopoietic cells and that FANCC
does not require the multimeric FA complex to exert this function.
*
This work was supported in part by National Institutes of
Health Grant HL48546 (to G. C. B.) and a grant from the Northwest Health Foundation (to Q. P.).The costs of publication of this article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
¶
To whom correspondence should be addressed: OHSU Cancer
Institute, CR145, Oregon Health Sciences University, Portland, OR 97201. E-mail: grover@ohsu.edu.
Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2002 by the American Society for Biochemistry and Molecular Biology.
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