4DNI

Structure of Editosome protein

4DNI の概要

• エントリーDOI: 10.2210/pdb4dni/pdb
• 分子名称: Fusion protein of RNA-editing complex proteins MP42 and MP18 (2 entities in total)
• 機能のキーワード: krepa3, krepa6, editosome, protein/rna binding, protein binding, rna binding protein
• 由来する生物種: Trypanosoma brucei; 詳細
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 28866.66

構造登録者

Park, Y.-J.,Hol, W. (登録日: 2012-02-08, 公開日: 2012-12-26, 最終更新日: 2024-02-28)

主引用文献

Park, Y.J.,Hol, W.G.
Explorations of linked editosome domains leading to the discovery of motifs defining conserved pockets in editosome OB-folds.
J.Struct.Biol., 180:362-373, 2012

PubMed Abstract: Trypanosomatids form a group of protozoa which contain parasites of human, animals and plants. Several of these species cause major human diseases, including Trypanosoma brucei which is the causative agent of human African trypanosomiasis, also called sleeping sickness. These organisms have many highly unusual features including a unique U-insertion/deletion RNA editing process in the single mitochondrion. A key multi-protein complex, called the ∼20S editosome, or editosome, carries out a cascade of essential RNA-modifying reactions and contains a core of 12 different proteins of which six are the interaction proteins A1 to A6. Each of these interaction proteins comprises a C-terminal OB-fold and the smallest interaction protein A6 has been shown to interact with four other editosome OB-folds. Here we report the results of a "linked OB-fold" approach to obtain a view of how multiple OB-folds might interact in the core of the editosome. Constructs with variants of linked domains in 25 expression and co-expression experiments resulted in 13 soluble multi-OB-fold complexes. In several instances, these complexes were more homogeneous in size than those obtained from corresponding unlinked OB-folds. The crystal structure of A3(OB) linked to A6 could be elucidated and confirmed the tight interaction between these two OB domains as seen also in our recent complex of A3(OB) and A6 with nanobodies. In the current crystal structure of A3(OB) linked to A6, hydrophobic side chains reside in well-defined pockets of neighboring OB-fold domains. When analyzing the available crystal structures of editosome OB-folds, it appears that in five instances "Pocket 1" of A1(OB), A3(OB) and A6 is occupied by a hydrophobic side chain from a neighboring protein. In these three different OB-folds, Pocket 1 is formed by two conserved sequence motifs and an invariant arginine. These pockets might play a key role in the assembly or mechanism of the editosome by interacting with hydrophobic side chains from other proteins.

PubMed: 22902563
DOI: 10.1016/j.jsb.2012.07.012

実験手法

X-RAY DIFFRACTION (2.55 Å)