6TC0

Crystal structure of MMS19-CIAO1-CIAO2B CIA targeting complex

6TC0 の概要

• エントリーDOI: 10.2210/pdb6tc0/pdb
• 関連するPDBエントリー: 6TBL 6TBN
• 分子名称: Probable cytosolic iron-sulfur protein assembly protein Ciao1, MIP18 family protein galla-2, MMS19 nucleotide excision repair protein homolog (3 entities in total)
• 機能のキーワード: fe-s cluster, fe-s, cia, cia core complex, cytosolic protein
• 由来する生物種: Drosophila melanogaster (Fruit fly); 詳細
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 337246.81

構造登録者

Kassube, S.A.,Thoma, N.H. (登録日: 2019-11-04, 公開日: 2020-07-29, 最終更新日: 2024-05-15)

主引用文献

Kassube, S.A.,Thoma, N.H.
Structural insights into Fe-S protein biogenesis by the CIA targeting complex.
Nat.Struct.Mol.Biol., 27:735-742, 2020

PubMed Abstract: The cytosolic iron-sulfur (Fe-S) assembly (CIA) pathway is required for the insertion of Fe-S clusters into cytosolic and nuclear client proteins, including many DNA replication and repair factors. The molecular mechanisms of client protein recognition and Fe-S cluster transfer remain unknown. Here, we report crystal structures of the CIA targeting complex (CTC), revealing that its CIAO2B subunit is centrally located and bridges CIAO1 and the client adaptor protein MMS19. Cryo-EM reconstructions of human CTC bound either to the DNA replication factor primase or to the DNA helicase DNA2, combined with biochemical, biophysical and yeast complementation assays, reveal an evolutionarily conserved, bipartite client recognition mode facilitated by CIAO1 and the structural flexibility of the MMS19 subunit. Unexpectedly, the primase Fe-S cluster is located ~70 Å away from the CTC reactive cysteine, implicating conformational dynamics of the CTC or additional maturation factors in the mechanism of Fe-S cluster transfer.

PubMed: 32632277
DOI: 10.1038/s41594-020-0454-0

実験手法

X-RAY DIFFRACTION (3.6 Å)