SPRTN protease-cleaved MRE11 decreases DNA repair and radiosensitises cancer cells

The human MRE11/RAD50/NBS1 (MRN) complex plays a crucial role in sensing and repairing DNA DSB. MRE11 possesses dual 3′−5′ exonuclease and endonuclease activity and forms the core of the multifunctional MRN complex. We previously identified a C-terminally truncated form of MRE11 (TR-MRE11) associate...

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Bibliographic Details
Published in:Cell death & disease Vol. 12; no. 2; pp. 165 - 17
Main Authors: Na, Juri, Newman, Joseph A., Then, Chee Kin, Syed, Junetha, Vendrell, Iolanda, Torrecilla, Ignacio, Ellermann, Sophie, Ramadan, Kristijan, Fischer, Roman, Kiltie, Anne E.
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 08.02.2021
Springer Nature B.V
Nature Publishing Group
Subjects:
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Acid Anhydride Hydrolases - genetics
Acid Anhydride Hydrolases - metabolism
Antibodies
Biochemistry
Biomedical and Life Sciences
Bladder cancer
Cell Biology
Cell Culture
Cell Cycle Proteins - genetics
Cell Cycle Proteins - metabolism
Cell Line, Tumor
Cell Proliferation - radiation effects
Deoxyribonucleic acid
DNA
DNA Damage
DNA Repair
DNA-Binding Proteins - genetics
DNA-Binding Proteins - metabolism
Double-strand break repair
Endonuclease
Exonuclease
G2 Phase Cell Cycle Checkpoints - radiation effects
HEK293 Cells
Humans
Immunohistochemistry
Immunology
Life Sciences
Mass spectroscopy
MRE11 Homologue Protein - genetics
MRE11 Homologue Protein - metabolism
MRE11 protein
Nuclear Proteins - genetics
Nuclear Proteins - metabolism
Nuclease
Post-translation
Proteinase
Proteolysis
Radiation therapy
Radiation Tolerance
Radiosensitivity
Site-directed mutagenesis
Substrate Specificity
Urinary Bladder Neoplasms - enzymology
Urinary Bladder Neoplasms - genetics
Urinary Bladder Neoplasms - pathology
Urinary Bladder Neoplasms - radiotherapy
ISSN:2041-4889, 2041-4889
Online Access:Get full text
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Summary:The human MRE11/RAD50/NBS1 (MRN) complex plays a crucial role in sensing and repairing DNA DSB. MRE11 possesses dual 3′−5′ exonuclease and endonuclease activity and forms the core of the multifunctional MRN complex. We previously identified a C-terminally truncated form of MRE11 (TR-MRE11) associated with post-translational MRE11 degradation. Here we identified SPRTN as the essential protease for the formation of TR-MRE11 and characterised the role of this MRE11 form in its DNA damage response (DDR). Using tandem mass spectrometry and site-directed mutagenesis, the SPRTN-dependent cleavage site for MRE11 was identified between 559 and 580 amino acids. Despite the intact interaction of TR-MRE11 with its constitutive core complex proteins RAD50 and NBS1, both nuclease activities of truncated MRE11 were dramatically reduced due to its deficient binding to DNA. Furthermore, lack of the MRE11 C-terminal decreased HR repair efficiency, very likely due to abolished recruitment of TR-MRE11 to the sites of DNA damage, which consequently led to increased cellular radiosensitivity. The presence of this DNA repair-defective TR-MRE11 could explain our previous finding that the high MRE11 protein expression by immunohistochemistry correlates with improved survival following radical radiotherapy in bladder cancer patients.
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ISSN:2041-4889
2041-4889
DOI:10.1038/s41419-021-03437-w