3A7L

Crystal structure of E. coli apoH-protein

3A7L の概要

• エントリーDOI: 10.2210/pdb3a7l/pdb
• 関連するPDBエントリー: 3A7A 3A7R
• 分子名称: Glycine cleavage system H protein (2 entities in total)
• 機能のキーワード: glycine cleavage system, lipoic acid, lipoyl, transport protein
• 由来する生物種: Escherichia coli
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 13688.90

構造登録者

Fujiwara, K.,Maita, N. (登録日: 2009-09-28, 公開日: 2010-01-19, 最終更新日: 2023-11-01)

主引用文献

Fujiwara, K.,Maita, N.,Hosaka, H.,Okamura-Ikeda, K.,Nakagawa, A.,Taniguchi, H.
Global conformational change associated with the two-step reaction catalyzed by Escherichia coli lipoate-protein ligase A.
J.Biol.Chem., 285:9971-9980, 2010

PubMed Abstract: Lipoate-protein ligase A (LplA) catalyzes the attachment of lipoic acid to lipoate-dependent enzymes by a two-step reaction: first the lipoate adenylation reaction and, second, the lipoate transfer reaction. We previously determined the crystal structure of Escherichia coli LplA in its unliganded form and a binary complex with lipoic acid (Fujiwara, K., Toma, S., Okamura-Ikeda, K., Motokawa, Y., Nakagawa, A., and Taniguchi, H. (2005) J Biol. Chem. 280, 33645-33651). Here, we report two new LplA structures, LplA.lipoyl-5'-AMP and LplA.octyl-5'-AMP.apoH-protein complexes, which represent the post-lipoate adenylation intermediate state and the pre-lipoate transfer intermediate state, respectively. These structures demonstrate three large scale conformational changes upon completion of the lipoate adenylation reaction: movements of the adenylate-binding and lipoate-binding loops to maintain the lipoyl-5'-AMP reaction intermediate and rotation of the C-terminal domain by about 180 degrees . These changes are prerequisites for LplA to accommodate apoprotein for the second reaction. The Lys(133) residue plays essential roles in both lipoate adenylation and lipoate transfer reactions. Based on structural and kinetic data, we propose a reaction mechanism driven by conformational changes.

PubMed: 20089862
DOI: 10.1074/jbc.M109.078717

実験手法

X-RAY DIFFRACTION (1.3 Å)