A Disease-Causing Single Amino Acid Deletion in the Coiled-Coil Domain of RAD50 Impairs MRE11 Complex Functions in Yeast and Humans.

The MRE11-RAD50-NBS1 complex plays a central role in response to DNA double-strand breaks. Here, we identify a patient with bone marrow failure and developmental defects caused by biallelic RAD50 mutations. One of the mutations creates a null allele, whereas the other (RAD50E1035?) leads to the loss of a single residue ...
in the heptad repeats within the RAD50 coiled-coil domain. This mutation represents a human RAD50 separation-of-function mutation that impairs DNA repair, DNA replication, and DNA end resection without affecting ATM-dependent DNA damage response. Purified recombinant proteins indicate that RAD50E1035? impairs MRE11 nuclease activity. The corresponding mutation in Saccharomyces cerevisiae causes severe thermosensitive defects in both DNA repair and Tel1ATM-dependent signaling. These findings demonstrate that a minor heptad break in the RAD50 coiled coil suffices to impede MRE11 complex functions in human and yeast. Furthermore, these results emphasize the importance of the RAD50 coiled coil to regulate MRE11-dependent DNA end resection in humans.
Mesh Terms:
Acid Anhydride Hydrolases, Bone Marrow Failure Disorders, Child, Child, Preschool, DNA Breaks, Double-Stranded, DNA Repair, DNA Replication, DNA-Binding Proteins, Developmental Disabilities, Endodeoxyribonucleases, Exodeoxyribonucleases, Humans, MRE11 Homologue Protein, Protein Binding, Protein Domains, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Sequence Analysis, Protein, Sequence Deletion, Signal Transduction
Cell Rep
Date: Dec. 29, 2020
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