5FHT

HtrA2 protease mutant V226K

5FHT の概要

• エントリーDOI: 10.2210/pdb5fht/pdb
• 分子名称: Serine protease HTRA2, mitochondrial, 2-(N-MORPHOLINO)-ETHANESULFONIC ACID, CHLORIDE ION, ... (6 entities in total)
• 機能のキーワード: hydrolase, apoptosis
• 由来する生物種: Homo sapiens (Human)
• 細胞内の位置: Mitochondrion intermembrane space: O43464
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 36526.99

構造登録者

Golik, P.,Dubin, G.,Zurawa-Janicka, D.,Lipinska, B.,Jarzab, M.,Wenta, T.,Gieldon, A.,Ciarkowski, A. (登録日: 2015-12-22, 公開日: 2016-09-07, 最終更新日: 2024-01-10)

主引用文献

Gieldon, A.,Zurawa-Janicka, D.,Jarzab, M.,Wenta, T.,Golik, P.,Dubin, G.,Lipinska, B.,Ciarkowski, J.
Distinct 3D Architecture and Dynamics of the Human HtrA2(Omi) Protease and Its Mutated Variants.
Plos One, 11:e0161526-e0161526, 2016

PubMed Abstract: HtrA2(Omi) protease controls protein quality in mitochondria and plays a major role in apoptosis. Its HtrA2S306A mutant (with the catalytic serine routinely disabled for an X-ray study to avoid self-degradation) is a homotrimer whose subunits contain the serine protease domain (PD) and the regulatory PDZ domain. In the inactive state, a tight interdomain interface limits penetration of both PDZ-activating ligands and PD substrates into their respective target sites. We successfully crystalized HtrA2V226K/S306A, whose active counterpart HtrA2V226K has had higher proteolytic activity, suggesting higher propensity to opening the PD-PDZ interface than that of the wild type HtrA2. Yet, the crystal structure revealed the HtrA2V226K/S306A architecture typical of the inactive protein. To get a consistent interpretation of crystallographic data in the light of kinetic results, we employed molecular dynamics (MD). V325D inactivating mutant was used as a reference. Our simulations demonstrated that upon binding of a specific peptide ligand NH2-GWTMFWV-COOH, the PDZ domains open more dynamically in the wild type protease compared to the V226K mutant, whereas the movement is not observed in the V325D mutant. The movement relies on a PDZ vs. PD rotation which opens the PD-PDZ interface in a lid-like (budding flower-like in trimer) fashion. The noncovalent hinges A and B are provided by two clusters of interfacing residues, harboring V325D and V226K in the C- and N-terminal PD barrels, respectively. The opening of the subunit interfaces progresses in a sequential manner during the 50 ns MD simulation. In the systems without the ligand only minor PDZ shifts relative to PD are observed, but the interface does not open. Further activation-associated events, e.g. PDZ-L3 positional swap seen in any active HtrA protein (vs. HtrA2), were not observed. In summary, this study provides hints on the mechanism of activation of wtHtrA2, the dynamics of the inactive HtrA2V325D, but does not allow to explain an increased activity of HtrA2V226K.

PubMed: 27571206
DOI: 10.1371/journal.pone.0161526

実験手法

X-RAY DIFFRACTION (1.95 Å)