3S8J

Crystal structure of a papaya latex serine protease inhibitor (PPI) at 2.6A resolution

3S8J の概要

• エントリーDOI: 10.2210/pdb3s8j/pdb
• 関連するPDBエントリー: 3S8K
• 分子名称: Latex serine proteinase inhibitor, 2-acetamido-2-deoxy-beta-D-glucopyranose, ACETATE ION, ... (6 entities in total)
• 機能のキーワード: kunitz-sti fold, serine protease inhibitor, hydrolase inhibitor
• 由来する生物種: Carica papaya (mamon)
• 細胞内の位置: Secreted, extracellular space: P80691
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 42287.59

構造登録者

Garcia-Pino, A. (登録日: 2011-05-29, 公開日: 2011-11-02, 最終更新日: 2024-11-06)

主引用文献

Azarkan, M.,Martinez-Rodriguez, S.,Buts, L.,Baeyens-Volant, D.,Garcia-Pino, A.
The plasticity of the beta-Trefoil fold constitutes an evolutionary platform for protease inhibition
J.Biol.Chem., 286:43726-43734, 2011

PubMed Abstract: Proteases carry out a number of crucial functions inside and outside the cell. To protect the cells against the potentially lethal activities of these enzymes, specific inhibitors are produced to tightly regulate the protease activity. Independent reports suggest that the Kunitz-soybean trypsin inhibitor (STI) family has the potential to inhibit proteases with different specificities. In this study, we use a combination of biophysical methods to define the structural basis of the interaction of papaya protease inhibitor (PPI) with serine proteases. We show that PPI is a multiple-headed inhibitor; a single PPI molecule can bind two trypsin units at the same time. Based on sequence and structural analysis, we hypothesize that the inherent plasticity of the β-trefoil fold is paramount in the functional evolution of this family toward multiple protease inhibition.

PubMed: 22027836
DOI: 10.1074/jbc.M111.291310

実験手法

X-RAY DIFFRACTION (2.6 Å)