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J. Biol. Chem., Vol. 276, Issue 28, 25903-25909, July 13, 2001
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From the Divisions of DNA damage activates cell cycle checkpoint
signaling pathways that coordinate cell cycle arrest and DNA repair.
Three of the proteins involved in checkpoint signaling, Rad1, Hus1, and
Rad9, have been shown to interact by immunoprecipitation and yeast
two-hybrid studies. However, it is not known how these proteins
interact and assemble into a complex. In the present study we
demonstrated that in human cells all the hRad9 and hHus1 and
approximately one-half of the cellular pool of hRad1 interacted as a
stable, biochemically discrete complex, with an apparent molecular mass of 160 kDa. This complex was reconstituted by co-expression of all
three recombinant proteins in a heterologous system, and the reconstituted complex exhibited identical chromatographic behavior as
the endogenous complex. Interaction studies using differentially tagged
proteins demonstrated that the proteins did not self-multimerize. Rather, each protein had a binding site for the other two partners, with the N terminus of hRad9 interacting with hRad1, the N terminus of
hRad1 interacting with hHus1, and the N terminus of hHus1 interacting with the C terminus of hRad9's predicted PCNA-like region.
Collectively, these analyses suggest a model of how these three
proteins assemble to form a functional checkpoint complex, which we
dubbed the 9-1-1 complex.
Reconstitution and Molecular Analysis of the hRad9-hHus1-hRad1
(9-1-1) DNA Damage Responsive Checkpoint Complex*
§,
¶,
,
, and
§
**
Developmental Oncology Research
and
Radiation Oncology and the Departments of
¶ Biochemistry and Molecular Biology and
§ Molecular Pharmacology, Mayo Clinic, Rochester, Minnesota
55905
*
This work was supported by National Institutes of Health
Grant CA-84321 and the Mayo Foundation.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.
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