Structural characterization of the stringent response related exopolyphosphatase/guanosine pentaphosphate phosphohydrolase protein familyKristensen, O., Laurberg, M., Liljas, A., Kastrup, J.S., Gajhede, M.
(2004) Biochemistry 43: 8894-8900
- PubMed: 15248747
- DOI: 10.1021/bi049083c
- Primary Citation of Related Structures:
- PubMed Abstract:
- Role of inorganic polyphosphate in promoting ribosomal protein degradation by the Lon protease in E. coli
Kuroda, A., Nomura, K., Ohtomo, R., Kato, J., Ikeda, T., Takiguchi, N., Ohtake, H., Kornberg, A.
(2001) Science 293: 705
- Guanosine pentaphosphate phosphohydrolase of Escherichia coli is a long-chain exopolyphosphatase
Keasling, J.D., Bertsch, L., Kornberg, A.
(1993) Proc Natl Acad Sci U S A 90: 7029
- Exopolyphosphate phosphatase and guanosine pentaphosphate phosphatase belong to the sugar kinase/actin/hsp 70 superfamily
Reizer, J., Reizer, A., Saier Jr., M.H., Bork, P., Sander, C.
(1993) Trends Biochem Sci 18: 247
Exopolyphosphatase/guanosine pentaphosphate phosphohydrolase (PPX/GPPA) enzymes play central roles in the bacterial stringent response induced by starvation. The high-resolution crystal structure of the putative Aquifex aeolicus PPX/GPPA phosphatase ...
Exopolyphosphatase/guanosine pentaphosphate phosphohydrolase (PPX/GPPA) enzymes play central roles in the bacterial stringent response induced by starvation. The high-resolution crystal structure of the putative Aquifex aeolicus PPX/GPPA phosphatase from the actin-like ATPase domain superfamily has been determined, providing the first insights to features of the common catalytic core of the PPX/GPPA family. The protein has a two-domain structure with an active site located in the interdomain cleft. Two crystal forms were investigated (type I and II) at resolutions of 1.53 and 2.15 A, respectively. This revealed a structural flexibility that has previously been described as a "butterfly-like" cleft opening around the active site in other actin-like superfamily proteins. A calcium ion is observed at the center of this region in type I crystals, substantiating that PPX/GPPA enzymes use metal ions for catalysis. Structural analysis suggests that nucleotides bind at a similar position to that seen in other members of the superfamily.
Biostructural Research, Department of Medicinal Chemistry, The Danish University of Pharmaceutical Sciences, Universitetsparken 2, DK-2100 Copenhagen, Denmark. email@example.com