1MKQ

Crystal Structure of the Mutant Variant of Cytochrome c Peroxidase in the 'Open' Uncross-linked form

1MKQ の概要

• エントリーDOI: 10.2210/pdb1mkq/pdb
• 関連するPDBエントリー: 1MK8 1MKQ 1MKR 1ML2
• 分子名称: Cytochrome c Peroxidase, PROTOPORPHYRIN IX CONTAINING FE, (4S)-2-METHYL-2,4-PENTANEDIOL, ... (4 entities in total)
• 機能のキーワード: tryptophan-tyrosine cross-link, trp cation radical, cytochrome c peroxidase, oxygen radical, oxidoreductase
• 由来する生物種: Saccharomyces cerevisiae (baker's yeast)
• 細胞内の位置: Mitochondrion matrix: P00431
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 34330.93

構造登録者

Bhaskar, B.,Immoos, C.E.,Shimizu, H.,Farmer, P.J.,Poulos, T.L. (登録日: 2002-08-29, 公開日: 2003-04-08, 最終更新日: 2024-02-14)

主引用文献

Bhaskar, B.,Immoos, C.E.,Shimizu, H.,Sulc, F.,Farmer, P.J.,Poulos, T.L.
A Novel Heme and Peroxide-Dependent Tryptophan-Tyrosine Cross-Link in a Mutant of Cytochrome c Peroxidase
J.Mol.Biol., 328:157-166, 2003

PubMed Abstract: The crystal structure of a cytochrome c peroxidase mutant where the distal catalytic His52 is converted to Tyr reveals that the tyrosine side-chain forms a covalent bond with the indole ring nitrogen atom of Trp51. We hypothesize that this novel bond results from peroxide activation by the heme iron followed by oxidation of Trp51 and Tyr52. This hypothesis has been tested by incorporation of a redox-inactive Zn-protoporphyrin into the protein, and the resulting crystal structure shows the absence of a Trp51-Tyr52 cross-link. Instead, the Tyr52 side-chain orients away from the heme active-site pocket, which requires a substantial rearrangement of residues 72-80 and 134-144. Additional experiments where heme-containing crystals of the mutant were treated with peroxide support our hypothesis that this novel Trp-Tyr cross-link is a peroxide-dependent process mediated by the heme iron.

PubMed: 12684005
DOI: 10.1016/S0022-2836(03)00179-7

実験手法

X-RAY DIFFRACTION (1.64 Å)