4N2Q

Crystal structure of THA8 in complex with Zm4 RNA

Summary for 4N2Q

• Entry DOI: 10.2210/pdb4n2q/pdb
• Related: 4ME2 4N2S
• Descriptor: THA8 RNA binding protein, RNA (5'-R(*AP*AP*GP*AP*AP*GP*AP*AP*AP*UP*UP*GP*G)-3') (3 entities in total)
• Functional Keywords: pentatricopeptide repeat (ppr) protein, group ii intron rna splicing, small intron rna, chloroplast, splicing-rna complex, splicing/rna
• Biological source: Brachypodium distachyon (Purple false brome); More
• Total number of polymer chains: 2
• Total formula weight: 32005.37

Authors

Ke, J.,Chen, R.Z.,Ban, T.,Zhou, X.E.,Gu, X.,Brunzelle, J.S.,Zhu, J.K.,Melcher, K.,Xu, H.E. (deposition date: 2013-10-06, release date: 2013-10-30, Last modification date: 2024-04-03)

Primary citation

Ke, J.,Chen, R.Z.,Ban, T.,Zhou, X.E.,Gu, X.,Tan, M.H.,Chen, C.,Kang, Y.,Brunzelle, J.S.,Zhu, J.K.,Melcher, K.,Xu, H.E.
Structural basis for RNA recognition by a dimeric PPR-protein complex.
Nat.Struct.Mol.Biol., 20:1377-1382, 2013

PubMed Abstract: 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.

PubMed: 24186060
DOI: 10.1038/nsmb.2710

Experimental method

X-RAY DIFFRACTION (2.8 Å)