2D6C

Crystal structure of myoglobin reconstituted with iron porphycene

2D6C の概要

• エントリーDOI: 10.2210/pdb2d6c/pdb
• 分子名称: Myoglobin, PORPHYCENE CONTAINING FE, IMIDAZOLE, ... (4 entities in total)
• 機能のキーワード: oxygen storage/transport, myoglobin, hemoprotein, porphycene, riken structural genomics/proteomics initiative, rsgi, structural genomics, oxygen storage-transport complex
• 由来する生物種: Physeter catodon (sperm whale)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 35849.11

構造登録者

Hayashi, T.,Murata, D.,Makino, M.,Sugimoto, H.,Matsuo, T.,Sato, H.,Shiro, Y.,Hisaeda, Y.,RIKEN Structural Genomics/Proteomics Initiative (RSGI) (登録日: 2005-11-11, 公開日: 2006-10-31, 最終更新日: 2023-10-25)

主引用文献

Hayashi, T.,Murata, D.,Makino, M.,Sugimoto, H.,Matsuo, T.,Sato, H.,Shiro, Y.,Hisaeda, Y.
Crystal structure and peroxidase activity of myoglobin reconstituted with iron porphycene
Inorg.Chem., 45:10530-10536, 2006

PubMed Abstract: The incorporation of an artificially created metal complex into an apomyoglobin is one of the attractive methods in a series of hemoprotein modifications. Single crystals of sperm whale myoglobin reconstituted with 13,16-dicarboxyethyl-2,7-diethyl-3,6,12,17-tetramethylporphycenatoiron(III) were obtained in the imidazole buffer, and the 3D structure with a 2.25-A resolution indicates that the iron porphycene, a structural isomer of hemin, is located in the normal position of the heme pocket. Furthermore, it was found that the reconstituted myoglobin catalyzed the H2O2-dependent oxidations of substrates such as guaiacol, thioanisole, and styrene. At pH 7.0 and 20 degrees C, the initial rate of the guaiacol oxidation is 11-fold faster than that observed for the native myoglobin. Moreover, the stopped-flow analysis of the reaction of the reconstituted protein with H2O2 suggested the formation of two reaction intermediates, compounds II- and III-like species, in the absence of a substrate. It is a rare example that compound III is formed via compound II in myoglobin chemistry. The enhancement of the peroxidase activity and the formation of the stable compound III in myoglobin with iron porphycene mainly arise from the strong coordination of the Fe-His93 bond.

PubMed: 17173408
DOI: 10.1021/ic061130x

実験手法

X-RAY DIFFRACTION (2.26 Å)