1XL3

Complex structure of Y.pestis virulence Factors YopN and TyeA

1XL3 の概要

• エントリーDOI: 10.2210/pdb1xl3/pdb
• 関連するPDBエントリー: 1XKP
• 分子名称: Secretion control protein, protein type A (3 entities in total)
• 機能のキーワード: yopn, tyea, yersinia pestis, type iii secretion, cell invasion
• 由来する生物種: Yersinia pestis; 詳細
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 70974.39

構造登録者

Schubot, F.D.,Jackson, M.W.,Penrose, K.J.,Cherry, S.,Tropea, J.E.,Plano, G.V.,Waugh, D.S. (登録日: 2004-09-30, 公開日: 2005-03-22, 最終更新日: 2023-08-23)

主引用文献

Schubot, F.D.,Jackson, M.W.,Penrose, K.J.,Cherry, S.,Tropea, J.E.,Plano, G.V.,Waugh, D.S.
Three-dimensional structure of a macromolecular assembly that regulates type III secretion in Yersinia pestis.
J.Mol.Biol., 346:1147-1161, 2005

PubMed Abstract: Yersinia pestis, the causative agent of plague, utilizes a type III secretion system (T3SS) to inject effector proteins directly into the cytosol of mammalian cells where they interfere with signal transduction pathways that regulate actin cytoskeleton dynamics and inflammation, thereby enabling the bacterium to avoid engulfment and destruction by macrophages. Type III secretion normally does not occur in the absence of close contact with eukaryotic cells. Negative regulation is mediated in part by a multiprotein complex that has been proposed to act as a physical impediment to type III secretion by blocking the entrance to the secretion apparatus prior to contact with mammalian cells. This complex is composed of YopN, its heterodimeric secretion chaperone SycN-YscB, and TyeA. Here, we report two crystal structures of YopN in complex with its heterodimeric secretion chaperone SycN-YscB and the co-regulatory protein TyeA, respectively. By merging these two overlapping structures, it was possible to construct a credible theoretical model of the YopN-SycN-YscB-TyeA complex. The modeled assembly features the secretion signaling elements of YopN at one end of an elongated structure and the secretion regulating TyeA binding site at the other. A patch of highly conserved residues on the surface of the C-terminal alpha-helix of TyeA may mediate its interaction with structural components of the secretion apparatus. Conserved arginine residues that reside inside a prominent cavity at the dimer interface of SycN-YscB were mutated in order to investigate whether they play a role in targeting the YopN-chaperone complex to the type III secretion apparatus. One of the mutants exhibited a phenotype that is consistent with this hypothesis.

PubMed: 15701523
DOI: 10.1016/j.jmb.2004.12.036

実験手法

X-RAY DIFFRACTION (2.2 Å)