4WOD

The duplicated taurocyamine kinase from Schistosoma mansoni complexed with arginine

4WOD の概要

• エントリーDOI: 10.2210/pdb4wod/pdb
• 分子名称: Taurocyamine kinase, ARGININE (3 entities in total)
• 機能のキーワード: transferase, duplicated, substrate specificity, transition state
• 由来する生物種: Schistosoma mansoni (Blood fluke)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 80597.91

構造登録者

Merceron, R.,Awama, A.,Montserret, R.,Marcillat, O.,Gouet, P. (登録日: 2014-10-15, 公開日: 2015-04-15, 最終更新日: 2024-01-10)

主引用文献

Merceron, R.,Awama, A.M.,Montserret, R.,Marcillat, O.,Gouet, P.
The Substrate-free and -bound Crystal Structures of the Duplicated Taurocyamine Kinase from the Human Parasite Schistosoma mansoni.
J.Biol.Chem., 290:12951-12963, 2015

PubMed Abstract: The taurocyamine kinase from the blood fluke Schistosoma mansoni (SmTK) belongs to the phosphagen kinase (PK) family and catalyzes the reversible Mg(2+)-dependent transfer of a phosphoryl group between ATP and taurocyamine. SmTK is derived from gene duplication, as are all known trematode TKs. Our crystallographic study of SmTK reveals the first atomic structure of both a TK and a PK with a bilobal structure. The two unliganded lobes present a canonical open conformation and interact via their respective C- and N-terminal domains at a helix-mediated interface. This spatial arrangement differs from that observed in true dimeric PKs, in which both N-terminal domains make contact. Our structures of SmTK complexed with taurocyamine or l-arginine compounds explain the mechanism by which an arginine residue of the phosphagen specificity loop is crucial for substrate specificity. An SmTK crystal was soaked with the dead end transition state analog (TSA) components taurocyamine-NO3 (2-)-MgADP. One SmTK monomer was observed with two bound TSAs and an asymmetric conformation, with the first lobe semiclosed and the second closed. However, isothermal titration calorimetry and enzyme kinetics experiments showed that the two lobes function independently. A small angle x-ray scattering model of SmTK-TSA in solution with two closed active sites was generated.

PubMed: 25837252
DOI: 10.1074/jbc.M114.628909

実験手法

X-RAY DIFFRACTION (1.9 Å)