4WO8
The substrate-free duplicated taurocyamine kinase from Schistosoma mansoni
Summary for 4WO8
| Entry DOI | 10.2210/pdb4wo8/pdb |
| Descriptor | Taurocyamine kinase (2 entities in total) |
| Functional Keywords | transferase, duplicated, substrate specificity, transition state |
| Biological source | Schistosoma mansoni (Blood fluke) |
| Total number of polymer chains | 1 |
| Total formula weight | 80422.70 |
| Authors | Merceron, R.,Awama, A.,Montserret, R.,Marcillat, O.,Gouet, P. (deposition date: 2014-10-15, release date: 2015-04-15, Last modification date: 2024-01-10) |
| Primary citation | 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 Cited by 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: 25837252DOI: 10.1074/jbc.M114.628909 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.2 Å) |
Structure validation
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