5emg

Crystal structures of PNA p(GCTGCTGC)2 duplex containing T-T mismatches

spinqualitylabelsall models 5emg, resolution 1.06Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5emg is a 4 chain structure with sequence from Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.06Å Ligands: CL, CPN, GPN, NA, TPN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed PNA is a promising molecule for antisense therapy of trinucleotide repeat disorders. We present the first crystal structures of RNA-PNA duplexes. They contain CUG repeats, relevant to myotonic dystrophy type I, and CAG repeats associated with poly-glutamine diseases. We also report the first PNA-PNA duplex containing mismatches. A comparison of the PNA homoduplex and the PNA-RNA heteroduplexes reveals PNA's intrinsic structural properties, shedding light on its reported sequence selectivity or intolerance of mismatches when it interacts with nucleic acids. PNA has a much lower helical twist than RNA and the resulting duplex has an intermediate conformation. PNA retains its overall conformation while locally there is much disorder, especially peptide bond flipping. In addition to the Watson-Crick pairing, the structures contain interesting interactions between the RNA's phosphate groups and the Pi electrons of the peptide bonds in PNA. The first crystal structures of RNA-PNA duplexes and a PNA-PNA duplex containing mismatches-toward anti-sense therapy against TREDs.,Kiliszek A, Banaszak K, Dauter Z, Rypniewski W Nucleic Acids Res. 2015 Dec 29. pii: gkv1513. PMID:26717983 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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