3c5r
Crystal Structure of the BARD1 Ankyrin Repeat Domain and Its Functional ConsequencesCrystal Structure of the BARD1 Ankyrin Repeat Domain and Its Functional Consequences
Structural highlights
FunctionBARD1_HUMAN Probable E3 ubiquitin-protein ligase. The BRCA1-BARD1 heterodimer specifically mediates the formation of 'Lys-6'-linked polyubiquitin chains and coordinates a diverse range of cellular pathways such as DNA damage repair, ubiquitination and transcriptional regulation to maintain genomic stability. Plays a central role in the control of the cell cycle in response to DNA damage. Acts by mediating ubiquitin E3 ligase activity that is required for its tumor suppressor function. Also forms a heterodimer with CSTF1/CSTF-50 to modulate mRNA processing and RNAP II stability by inhibiting pre-mRNA 3' cleavage.[1] [2] [3] [4] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedBARD1 is the constitutive nuclear partner to the breast and ovarian cancer-specific tumor suppressor BRCA1. Together, they form a heterodimeric complex responsible for maintaining genomic stability through nuclear functions involving DNA damage signaling and repair, transcriptional regulation, and cell cycle control. We report the 2.0A structure of the BARD1 ankyrin repeat domain. The structure includes four ankyrin repeats with a non-canonical C-terminal capping ankyrin repeat and a well ordered extended loop preceding the first repeat. Conserved surface features show an acidic patch and an acidic pocket along the surface typically used by ankyrin repeat domains for binding cognate proteins. We also demonstrate that two reported mutations, N470S and V507M, in the ankyrin repeat domain do not result in observable structural defects. These results provide a structural basis for exploring the biological function of the ankyrin repeat domain and for modeling BARD1 isoforms. Crystal structure of the BARD1 ankyrin repeat domain and its functional consequences.,Fox D 3rd, Le Trong I, Rajagopal P, Brzovic PS, Stenkamp RE, Klevit RE J Biol Chem. 2008 Jul 25;283(30):21179-86. Epub 2008 May 14. PMID:18480049[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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