3drw

Crystal Structure of a Phosphofructokinase from Pyrococcus horikoshii OT3 with AMP

spinqualitylabelsall models 3drw, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3drw is a 2 chain structure with sequence from Pyrococcus horikoshii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AMP, NA Related: 1u2x Gene: pfkC, PH1645 (Pyrococcus horikoshii) Activity: ADP-specific phosphofructokinase, with EC number 2.7.1.146 Resources: FirstGlance, OCA, RCSB, PDBsum, TOPSAN Function [K6PF_PYRHO] Catalyzes the phosphorylation of fructose 6-phosphate to fructose 1,6-bisphosphate using ADP as the phosphate donor (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Some hyperthermophilic archaea use a modified glycolytic pathway that employs an ADP-dependent glucokinase (ADP-GK) and an ADP-dependent phosphofructokinase (ADP-PFK) or, in the case of Methanococcus jannaschii, a bifunctional ADP-dependent glucophosphofructokinase (ADP-GK/PFK). The crystal structures of three ADP-GKs have been determined. However, there is no structural information available for ADP-PFKs or the ADP-GK/PFK. Here, we present the first crystal structure of an ADP-PFK from Pyrococcus horikoshii OT3 (PhPFK) in both apo- and AMP-bound forms determined to 2.0-A and 1.9-A resolution, respectively, along with biochemical characterization of the enzyme. The overall structure of PhPFK maintains a similar large and small alpha/beta domain structure seen in the ADP-GK structures. A large conformational change accompanies binding of phosphoryl donor, acceptor, or both, in all members of the ribokinase superfamily characterized thus far, which is believed to be critical to enzyme function. Surprisingly, no such conformational change was observed in the AMP-bound PhPFK structure compared with the apo structure. Through comprehensive site-directed mutagenesis of the substrate binding pocket we identified residues that were critical for both substrate recognition and the phosphotransfer reaction. The catalytic residues and many of the substrate binding residues are conserved between PhPFK and ADP-GKs; however, four key residues differ in the sugar-binding pocket, which we have shown determine the sugar-binding specificity. Using these results we were able to engineer a mutant PhPFK that mimics the ADP-GK/PFK and is able to phosphorylate both fructose 6-phosphate and glucose. ADP-dependent 6-phosphofructokinase from Pyrococcus horikoshii OT3: structure determination and biochemical characterization of PH1645.,Currie MA, Merino F, Skarina T, Wong AH, Singer A, Brown G, Savchenko A, Caniuguir A, Guixe V, Yakunin AF, Jia Z J Biol Chem. 2009 Aug 21;284(34):22664-71. Epub 2009 Jun 24. PMID:19553681 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Phosphofructokinase (PFK)

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