1XTM

Crystal structure of the double mutant Y88H-P104H of a SOD-like protein from Bacillus subtilis.

1XTM の概要

• エントリーDOI: 10.2210/pdb1xtm/pdb
• 関連するPDBエントリー: 1S4I 1XTL
• 分子名称: Hypothetical superoxide dismutase-like protein yojM, COPPER (II) ION, ZINC ION, ... (4 entities in total)
• 機能のキーワード: sod, cu-zn sod, sod-like, superoxide dismutase mutants, structural genomics, unknown function
• 由来する生物種: Bacillus subtilis
• 細胞内の位置: Cell membrane; Lipid-anchor (Potential): O31851
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 37963.73

構造登録者

Calderone, V.,Mangani, S.,Banci, L.,Benvenuti, M.,Bertini, I.,Fantoni, A.,Viezzoli, M.S. (登録日: 2004-10-22, 公開日: 2005-10-04, 最終更新日: 2024-11-20)

主引用文献

Banci, L.,Benvenuti, M.,Bertini, I.,Cabelli, D.E.,Calderone, V.,Fantoni, A.,Mangani, S.,Migliardi, M.,Viezzoli, M.S.
From an Inactive Prokaryotic SOD Homologue to an Active Protein through Site-Directed Mutagenesis.
J.Am.Chem.Soc., 127:13287-13292, 2005

PubMed Abstract: It is known that several prokaryotic protein sequences, characterized by high homology with the eukaryotic Cu,ZnSODs, lack some of the metal ligands. In the present work, we have stepwise reintroduced the two missing copper ligands in the SOD-like protein of Bacillus subtilis, through site-directed mutagenesis. The mutant with three out of the four His that bind copper is not active, whereas the fully reconstituted mutant displays an activity of about 10% that of human Cu,ZnSOD. The mutated proteins have been characterized in solution and in the solid state. In solution, the proteins experience conformational disorder, which is believed to be partly responsible for the decreased enzymatic activity and sheds light on the tendency of several human SOD mutants to introduce mobility in the protein frame. In the crystal, on the contrary, the protein has a well-defined conformation, giving rise to dimers through the coordination of an exogenous zinc ion. The catalytic properties of the double mutant, which might be regarded as a step in an artificial evolution from a nonactive SOD to a fully functioning enzyme, are discussed on the basis of the structural and dynamical properties.

PubMed: 16173759
DOI: 10.1021/ja052790o

実験手法

X-RAY DIFFRACTION (1.6 Å)