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For:
Knighton LE
, Nitika, Omkar S, Truman AW.
The C-terminal domain of Hsp70 is responsible for paralog-specific regulation of ribonucleotide reductase.
PLoS Genet
2022;
18
:e1010079. [PMID:
35417483
PMCID:
PMC9037926
DOI:
10.1371/journal.pgen.1010079
]
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[Received: 02/07/2022]
[Revised: 04/25/2022]
[Accepted: 03/21/2022]
[Indexed: 11/23/2022]
Open
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Cited by Other Article(s)
1
Omkar S
, Wani TH, Zheng B, Mitchem MM, Truman AW. The APE2 Exonuclease Is a Client of the Hsp70–Hsp90 Axis in Yeast and Mammalian Cells.
Biomolecules
2022;
12
:biom12070864. [PMID:
35883419
PMCID:
PMC9312491
DOI:
10.3390/biom12070864
]
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RCA
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[Received: 06/02/2022]
[Revised: 06/18/2022]
[Accepted: 06/18/2022]
[Indexed: 12/10/2022]
Open
Abstract
Molecular chaperones such as Hsp70 and Hsp90 help fold and activate proteins in important signal transduction pathways that include DNA damage response (DDR). Previous studies have suggested that the levels of the mammalian APE2 exonuclease, a protein critical for DNA repair, may be dependent on chaperone activity. In this study, we demonstrate that the budding yeast Apn2 exonuclease interacts with molecular chaperones Ssa1 and Hsp82 and the co-chaperone Ydj1. Although Apn2 does not display a binding preference for any specific cytosolic Hsp70 or Hsp90 paralog, Ssa1 is unable to support Apn2 stability when present as the sole Ssa in the cell. Demonstrating conservation of this mechanism, the exonuclease APE2 also binds to Hsp70 and Hsp90 in mammalian cells. Inhibition of chaperone function via specific small molecule inhibitors results in a rapid loss of APE2 in a range of cancer cell lines. Taken together, these data identify APE2 and Apn2 as clients of the chaperone system in yeast and mammalian cells and suggest that chaperone inhibition may form the basis of novel anticancer therapies that target APE2-mediated processes.
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Key Words
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MESH Headings
Adenosine Triphosphatases
Animals
DNA-(Apurinic or Apyrimidinic Site) Lyase/genetics
DNA-(Apurinic or Apyrimidinic Site) Lyase/metabolism
Exodeoxyribonucleases
Exonucleases/metabolism
HSP40 Heat-Shock Proteins
HSP70 Heat-Shock Proteins/metabolism
HSP90 Heat-Shock Proteins/metabolism
Mammals/metabolism
Molecular Chaperones/metabolism
Protein Binding
Saccharomyces cerevisiae/genetics
Saccharomyces cerevisiae/metabolism
Saccharomyces cerevisiae Proteins/metabolism
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Grants
R01 GM139885 NIGMS NIH HHS
R15 GM139059 NIGMS NIH HHS
R01GM139885 NIH HHS
R15GM139059 NIH HHS
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Affiliation(s)
Siddhi Omkar
Correspondence:
(S.O.);
(A.W.T.)
Tasaduq H. Wani
Bo Zheng
Megan M. Mitchem
Andrew W. Truman
Correspondence:
(S.O.);
(A.W.T.)
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