Study of structural changes in protein by differential scanning calorimetry: structure-based thermodynamic stability of the BRCT domain of BRCA1, BARD1 and 53BP1
Abstract
Tandem BRCT repeats are phosphopeptide-binding modules found in several proteins that participate in transcriptional activation networks, DNA-damage checkpoint control and genomic stability. The BRCA1-associated RING domain protein 1 (BARD1) is a 777 amino acid-long protein that contains a RING finger, three ankyrin repeats and the BRCT domain. It is the major binding partner of the breast and ovarian tumor suppressor BRCA1, functioning by forming a heterodimer with BRCA1. 53BP1 is another protein with a BRCT domain that plays an important role in the cellular response to DNA damage. 53BP1 interacts with the DNA-binding core domain of the tumor suppressor p53 and enhances p53-mediated transcriptional activation. The interaction between p53 and 53BP1 is mediated by the C-terminal BRCT domain. It has been shown that thermodynamic destabilization of the BRCT domain of BRCA1 is induced by missense mutations linked to hereditary breast-ovarian cancer. To gain insight into the differential t ...
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