1TD3

Crystal structure of VSHP_BPP21 in space group C2

1TD3 の概要

• エントリーDOI: 10.2210/pdb1td3/pdb
• 関連するPDBエントリー: 1TD4
• 分子名称: Head decoration protein (2 entities in total)
• 機能のキーワード: shp, viral protein
• 由来する生物種: Enterobacteria phage P21
• 細胞内の位置: Virion : P36275
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 35965.34

構造登録者

Chang, C.,Forrer, P.,Ott, D.,Wlodawer, A.,Plueckthun, A. (登録日: 2004-05-21, 公開日: 2004-11-02, 最終更新日: 2023-08-23)

主引用文献

Forrer, P.,Chang, C.,Ott, D.,Wlodawer, A.,Plueckthun, A.
Kinetic Stability and Crystal Structure of the Viral Capsid Protein SHP.
J.Mol.Biol., 344:179-193, 2004

PubMed Abstract: SHP, the capsid-stabilizing protein of lambdoid phage 21, is highly resistant against denaturant-induced unfolding. We demonstrate that this high functional stability of SHP is due to a high kinetic stability with a half-life for unfolding of 25 days at zero denaturant, while the thermodynamic stability is not unusually high. Unfolding experiments demonstrated that the trimeric state (also observed in crystals and present on the phage capsid) of SHP is kinetically stable in solution, while the monomer intermediate unfolds very rapidly. We also determined the crystal structure of trimeric SHP at 1.5A resolution, which was compared to that of its functional homolog gpD. This explains how a tight network of H-bonds rigidifies crucial interpenetrating residues, leading to the observed extremely slow trimer dissociation or denaturation. Taken as a whole, our results provide molecular-level insights into natural strategies to achieve kinetic stability by taking advantage of protein oligomerization. Kinetic stability may be especially needed in phage capsids to allow survival in harsh environments.

PubMed: 15504410
DOI: 10.1016/j.jmb.2004.09.030

実験手法

X-RAY DIFFRACTION (2.37 Å)