4wim

Crystal Structure of the GMP Synthetase from Plasmodium falciparum

spinqualitylabelsall models 4wim, resolution 3.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4wim is a 2 chain structure with sequence from Plasmodium falciparum 3D7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.6Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8IJR9_PLAF7 Publication Abstract from PubMed GMP synthetase (GMPS), a key enzyme in the purine biosynthetic pathway performs catalysis through a coordinated process across two catalytic pockets for which the mechanism remains unclear. Crystal structures of Plasmodium falciparum GMPS in conjunction with mutational and enzyme kinetic studies reported here provide evidence that an 85 degrees rotation of the GATase domain is required for ammonia channelling and thus for the catalytic activity of this two-domain enzyme. We suggest that conformational changes in helix 371-375 holding catalytic residues and in loop 376-401 along the rotation trajectory trigger the different steps of catalysis, and establish the central role of Glu374 in allostery and inter-domain crosstalk. These studies reveal the mechanism of domain rotation and inter-domain communication, providing a molecular framework for the function of all single polypeptide GMPSs and form a solid basis for rational drug design targeting this therapeutically important enzyme. Active site coupling in Plasmodium falciparum GMP synthetase is triggered by domain rotation.,Ballut L, Violot S, Shivakumaraswamy S, Thota LP, Sathya M, Kunala J, Dijkstra BW, Terreux R, Haser R, Balaram H, Aghajari N Nat Commun. 2015 Nov 23;6:8930. doi: 10.1038/ncomms9930. PMID:26592566 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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