5maq

Crystal Structure of Polyphosphate Kinase from Meiothermus ruber bound to ADP and PPi

spinqualitylabelsall models 5maq, resolution 2.46Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5maq is a 4 chain structure with sequence from Meiothermus ruber H328. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.46Å Ligands: ADP, MG, PPV Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PK23_MEIRD Uses inorganic polyphosphate (polyP) as a donor to convert both AMP to ADP and ADP to ATP. Can also use GMP, CMP, UMP, GDP, CDP and UDP. Publication Abstract from PubMed Inorganic polyphosphate is a ubiquitous, linear biopolymer built of up to thousands of phosphate residues that are linked by energy-rich phosphoanhydride bonds. Polyphosphate kinases of the family 2 (PPK2) use polyphosphate to catalyze the reversible phosphorylation of nucleotide phosphates and are highly relevant as targets for new pharmaceutical compounds and as biocatalysts for cofactor regeneration. PPK2s can be classified based on their preference for nucleoside mono- or diphosphates or both. The detailed mechanism of PPK2s and the molecular basis for their substrate preference is unclear, which is mainly due to the lack of high-resolution structures with substrates or substrate analogs. Here, we report the structural analysis and comparison of a class I PPK2 (ADP-phosphorylating) and a class III PPK2 (AMP- and ADP-phosphorylating), both complexed with polyphosphate and/or nucleotide substrates. Together with complementary biochemical analyses, these define the molecular basis of nucleotide specificity and are consistent with a Mg(2+) catalyzed in-line phosphoryl transfer mechanism. This mechanistic insight will guide the development of PPK2 inhibitors as potential antibacterials or genetically modified PPK2s that phosphorylate alternative substrates. Substrate recognition and mechanism revealed by ligand-bound polyphosphate kinase 2 structures.,Parnell AE, Mordhorst S, Kemper F, Giurrandino M, Prince JP, Schwarzer NJ, Hofer A, Wohlwend D, Jessen HJ, Gerhardt S, Einsle O, Oyston PCF, Andexer JN, Roach PL Proc Natl Acad Sci U S A. 2018 Mar 12. pii: 1710741115. doi:, 10.1073/pnas.1710741115. PMID:29531036 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Phosphotransferase 3D structures

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