3D0T

Structure of the BNB domain of the Hsp70 cochaperone Bag2

3D0T の概要

• エントリーDOI: 10.2210/pdb3d0t/pdb
• 関連するPDBエントリー: 3CQX
• 分子名称: BAG family molecular chaperone regulator 2 (2 entities in total)
• 機能のキーワード: 4-helix bundle, chaperone, coiled coil
• 由来する生物種: Mus musculus (Mouse)
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 38804.50

構造登録者

Xu, Z.,Nix, J.C.,Devlin, K.,Misra, S. (登録日: 2008-05-02, 公開日: 2008-11-25, 最終更新日: 2024-02-21)

主引用文献

Xu, Z.,Page, R.C.,Gomes, M.M.,Kohli, E.,Nix, J.C.,Herr, A.B.,Patterson, C.,Misra, S.
Structural basis of nucleotide exchange and client binding by the Hsp70 cochaperone Bag2.
Nat.Struct.Mol.Biol., 15:1309-1317, 2008

PubMed Abstract: Cochaperones are essential for Hsp70- and Hsc70-mediated folding of proteins and include nucleotide-exchange factors (NEFs) that assist protein folding by accelerating ADP-ATP exchange on Hsp70. The cochaperone Bag2 binds misfolded Hsp70 clients and also acts as an NEF, but the molecular basis for its function is unclear. We show that, rather than being a member of the Bag domain family, Bag2 contains a new type of Hsp70 NEF domain, which we call the 'brand new bag' (BNB) domain. Free and Hsc70-bound crystal structures of Bag2-BNB show its dimeric structure, in which a flanking linker helix and loop bind to Hsc70 to promote nucleotide exchange. NMR analysis demonstrates that the client binding sites and Hsc70-interaction sites of the Bag2-BNB overlap, and that Hsc70 can displace clients from Bag2-BNB, indicating a distinct mechanism for the regulation of Hsp70-mediated protein folding by Bag2.

PubMed: 19029896
DOI: 10.1038/nsmb.1518

実験手法

X-RAY DIFFRACTION (2.55 Å)