3n1j

Crystal structure of a StWhy2-dT32 complex

spinqualitylabelsall models 3n1j, resolution 2.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3n1j is a 2 chain structure with sequence from Solanum tuberosum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.65Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function WHY2_SOLTU Single-stranded DNA-binding protein that may be involved in the maintenance of mitochondrial genome stability by preventing break-induced DNA rearrangements. 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 PubMed DNA double-strand breaks are highly detrimental to all organisms and need to be quickly and accurately repaired. Although several proteins are known to maintain plastid and mitochondrial genome stability in plants, little is known about the mechanisms of DNA repair in these organelles and the roles of specific proteins. Here, using ciprofloxacin as a DNA damaging agent specific to the organelles, we show that plastids and mitochondria can repair DNA double-strand breaks through an error-prone pathway similar to the microhomology-mediated break-induced replication observed in humans, yeast, and bacteria. This pathway is negatively regulated by the single-stranded DNA (ssDNA) binding proteins from the Whirly family, thus indicating that these proteins could contribute to the accurate repair of plant organelle genomes. To understand the role of Whirly proteins in this process, we solved the crystal structures of several Whirly-DNA complexes. These reveal a nonsequence-specific ssDNA binding mechanism in which DNA is stabilized between domains of adjacent subunits and rendered unavailable for duplex formation and/or protein interactions. Our results suggest a model in which the binding of Whirly proteins to ssDNA would favor accurate repair of DNA double-strand breaks over an error-prone microhomology-mediated break-induced replication repair pathway. Crystal structures of DNA-Whirly complexes and their role in Arabidopsis organelle genome repair.,Cappadocia L, Marechal A, Parent JS, Lepage E, Sygusch J, Brisson N Plant Cell. 2010 Jun;22(6):1849-67. Epub 2010 Jun 15. PMID:20551348 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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