4n2s | pdb_00004n2s

Crystal Structure of THA8 in complex with Zm1a-6 RNA

spinqualitylabelsall models 4n2s, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4n2s is a 2 chain structure with sequence from Brachypodium distachyon. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function I1HB13_BRADI Publication Abstract from PubMed Thylakoid assembly 8 (THA8) is a pentatricopeptide repeat (PPR) RNA-binding protein required for the splicing of the transcript of ycf3, a gene involved in chloroplast thylakoid-membrane biogenesis. Here we report the identification of multiple THA8-binding sites in the ycf3 intron and present crystal structures of Brachypodium distachyon THA8 either free of RNA or bound to two of the identified RNA sites. The apostructure reveals a THA8 monomer with five tandem PPR repeats arranged in a planar fold. The complexes of THA8 bound to the two short RNA fragments surprisingly reveal asymmetric THA8 dimers with the bound RNAs at the dimeric interface. RNA binding induces THA8 dimerization, with a conserved G nucleotide of the bound RNAs making extensive contacts with both monomers. Together, these results establish a new model of RNA recognition by RNA-induced formation of an asymmetric dimer of a PPR protein. Structural basis for RNA recognition by a dimeric PPR-protein complex.,Ke J, Chen RZ, Ban T, Zhou XE, Gu X, Tan MH, Chen C, Kang Y, Brunzelle JS, Zhu JK, Melcher K, Xu HE Nat Struct Mol Biol. 2013 Nov 3. doi: 10.1038/nsmb.2710. PMID:24186060 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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