Academic Journal
Reversible inhibition of Escherichia coli inorganic pyrophosphatase by fluoride: trapped catalytic intermediates in cryo-crystallographic studies
| العنوان: | Reversible inhibition of Escherichia coli inorganic pyrophosphatase by fluoride: trapped catalytic intermediates in cryo-crystallographic studies |
|---|---|
| المؤلفون: | Samygina, V. R., Moiseev, V. M., Rodina, E. V., Vorobyeva, N. N., Popov, A. N., Kurilova, S. A., Nazarova, T. I., Avaeva, S. M., Bartunik, H. D. |
| المصدر: | Journal of molecular biology 366, 1305-1317 (2007). doi:10.1016/j.jmb.2006.11.082 |
| بيانات النشر: | Elsevier |
| سنة النشر: | 2007 |
| المجموعة: | DESY Publication Database (PUBDB) |
| مصطلحات موضوعية: | info:eu-repo/classification/ddc/570, Binding Sites, Catalysis, Diphosphates: chemistry, Diphosphates: pharmacology, Enzyme Activation, Escherichia coli: enzymology, Fluorides: chemistry, Fluorides: pharmacology, Hydrogen-Ion Concentration, Hydrolysis, Inorganic Pyrophosphatase: chemistry, Inorganic Pyrophosphatase: genetics, Inorganic Pyrophosphatase: metabolism, Magnesium: chemistry, Magnesium: pharmacology, Manganese: chemistry, Manganese: pharmacology, Models, Molecular, Mutation, Protein Isoforms, Substrate Specificity, X-Ray Diffraction: methods, Diphosphates, Fluorides, Magnesium, Manganese, Inorganic Pyrophosphatase |
| جغرافية الموضوع: | DE |
| الوصف: | Here, we describe high-resolution X-ray structures of Escherichia coli inorganic pyrophosphatase (E-PPase) complexed with the substrate, magnesium, or manganese pyrophosphate. The structures correspond to steps in the catalytic synthesis of enzyme-bound pyrophosphate (PP(i)) in the presence of fluoride as an inhibitor of hydrolysis. The catalytic reaction intermediates were trapped applying a new method that we developed for initiating hydrolytic activity in the E-PPase crystal. X-ray structures were obtained for three consecutive states of the enzyme in the course of hydrolysis. Comparative analysis of these structures showed that the Mn2+-supported hydrolysis of the phosphoanhydride bond is followed by a fast release of the leaving phosphate from the P1 site. The electrophilic phosphate P2 is trapped in the "down" conformation. Its movement into the "up" position most likely represents the rate-limiting step of Mn2+-supported hydrolysis. We further determined the crystal structure of the Arg43Gln mutant variant of E-PPase complexed with one phosphate and four Mn ions. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/issn/1089-8638; info:eu-repo/semantics/altIdentifier/issn/0022-2836; info:eu-repo/semantics/altIdentifier/pmid/pmid:17196979; info:eu-repo/semantics/altIdentifier/wos/WOS:000244649500021; https://bib-pubdb1.desy.de/record/81600; https://bib-pubdb1.desy.de/search?p=id:%22PHPPUBDB-6428%22 |
| الاتاحة: | https://bib-pubdb1.desy.de/record/81600 https://bib-pubdb1.desy.de/search?p=id:%22PHPPUBDB-6428%22 |
| Rights: | info:eu-repo/semantics/closedAccess |
| رقم الانضمام: | edsbas.159630AE |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |