1Y9L

The X-ray structure of an secretion system protein

1Y9L の概要

• エントリーDOI: 10.2210/pdb1y9l/pdb
• 関連するPDBエントリー: 1Y9T
• 分子名称: Lipoprotein mxiM, ACETATE ION, UNDECANE, ... (4 entities in total)
• 機能のキーワード: cracked beta barrel, mixed alpha/beta, lipid binding protein
• 由来する生物種: Shigella flexneri
• 細胞内の位置: Cell outer membrane; Lipid-anchor (Probable): P0A1X2
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 13119.24

構造登録者

Lario, P.I.,Pfuetzer, R.A.,Frey, E.A.,Creagh, L.,Haynes, C.,Maurelli, A.T.,Strynadka, N.C. (登録日: 2004-12-15, 公開日: 2005-04-12, 最終更新日: 2024-11-20)

主引用文献

Lario, P.I.,Pfuetzner, R.A.,Frey, E.A.,Creagh, L.,Haynes, C.,Maurelli, A.T.,Strynadka, N.C.
Structure and biochemical analysis of a secretin pilot protein.
Embo J., 24:1111-1121, 2005

PubMed Abstract: The ability to translocate virulence proteins into host cells through a type III secretion apparatus (TTSS) is a hallmark of several Gram-negative pathogens including Shigella, Salmonella, Yersinia, Pseudomonas, and enteropathogenic Escherichia coli. In common with other types of bacterial secretion apparatus, the assembly of the TTSS complex requires the preceding formation of its integral outer membrane secretin ring component. We have determined at 1.5 A the structure of MxiM28-142, the Shigella pilot protein that is essential for the assembly and membrane association of the Shigella secretin, MxiD. This represents the first atomic structure of a secretin pilot protein from the several bacterial secretion systems containing an orthologous secretin component. A deep hydrophobic cavity is observed in the novel 'cracked barrel' structure of MxiM, providing a specific binding domain for the acyl chains of bacterial lipids, a proposal that is supported by our various lipid/MxiM complex structures. Isothermal titration analysis shows that the C-terminal domain of the secretin, MxiD525-570, hinders lipid binding to MxiM.

PubMed: 15775974
DOI: 10.1038/sj.emboj.7600610

実験手法

X-RAY DIFFRACTION (1.5 Å)