3IPO

Crystal structure of YnjE

3IPO の概要

• エントリーDOI: 10.2210/pdb3ipo/pdb
• 分子名称: Putative thiosulfate sulfurtransferase ynjE, PHOSPHATE ION, SODIUM ION, ... (7 entities in total)
• 機能のキーワード: triple-domain rhodanese, transferase
• 由来する生物種: Escherichia coli K-12
• 細胞内の位置: Periplasm (Potential): P78067
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 93656.84

構造登録者

Haenzelmann, P.,Kuper, J.,Schindelin, H. (登録日: 2009-08-18, 公開日: 2009-12-08, 最終更新日: 2024-11-06)

主引用文献

Hanzelmann, P.,Dahl, J.U.,Kuper, J.,Urban, A.,Muller-Theissen, U.,Leimkuhler, S.,Schindelin, H.
Crystal structure of YnjE from Escherichia coli, a sulfurtransferase with three rhodanese domains.
Protein Sci., 18:2480-2491, 2009

PubMed Abstract: Rhodaneses/sulfurtransferases are ubiquitous enzymes that catalyze the transfer of sulfane sulfur from a donor molecule to a thiophilic acceptor via an active site cysteine that is modified to a persulfide during the reaction. Here, we present the first crystal structure of a triple-domain rhodanese-like protein, namely YnjE from Escherichia coli, in two states where its active site cysteine is either unmodified or present as a persulfide. Compared to well-characterized tandem domain rhodaneses, which are composed of one inactive and one active domain, YnjE contains an extra N-terminal inactive rhodanese-like domain. Phylogenetic analysis reveals that YnjE triple-domain homologs can be found in a variety of other gamma-proteobacteria, in addition, some single-, tandem-, four and even six-domain variants exist. All YnjE rhodaneses are characterized by a highly conserved active site loop (CGTGWR) and evolved independently from other rhodaneses, thus forming their own subfamily. On the basis of structural comparisons with other rhodaneses and kinetic studies, YnjE, which is more similar to thiosulfate:cyanide sulfurtransferases than to 3-mercaptopyruvate:cyanide sulfurtransferases, has a different substrate specificity that depends not only on the composition of the active site loop with the catalytic cysteine at the first position but also on the surrounding residues. In vitro YnjE can be efficiently persulfurated by the cysteine desulfurase IscS. The catalytic site is located within an elongated cleft, formed by the central and C-terminal domain and is lined by bulky hydrophobic residues with the catalytic active cysteine largely shielded from the solvent.

PubMed: 19798741
DOI: 10.1002/pro.260

実験手法

X-RAY DIFFRACTION (2.4 Å)