|Acta Crystallographica Section F: Structural Biology and Crystallization Communications (2011) 67:1323-7|
|Northeast Structural Genomics Consortium|
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ATP pyrophosphatases (ATP PPases) are widely distributed in archaea and eukaryotes. ...
They share an HUP domain at the N-terminus with a conserved PP-motif that interacts with the phosphates of ATP. The PF0828 protein from Pyrococcus furiosus is a member of the ATP PPase superfamily and it also has a 100-residue C-terminal extension that contains a strictly conserved EGG(E/D)xE(T/S) motif, which has been named the EGT-motif. Here, crystal structures of PF0828 alone and in complex with ATP or AMP are reported. The HUP domain contains a central five-stranded β-sheet that is surrounded by four helices, as in other related structures. The C-terminal extension forms a separate domain, named the EGT domain, which makes tight interactions with the HUP domain, bringing the EGT-motif near to the PP-motif and defining the putative active site of PF0828. Both motifs interact with the phosphate groups of ATP. A loop in the HUP domain undergoes a large conformational change to recognize the adenine base of ATP. In solution and in the crystal PF0828 is a dimer formed by the side-by-side arrangement of the HUP domains of the two monomers. The putative active site is located far from the dimer interface.
|chemistry metabolism enzymology |
|Models, Molecular Protein Structure, Quaternary Protein Structure, Tertiary Humans Molecular Sequence Data Pyrophosphatases Sequence Alignment Animals Pyrococcus furiosus Adenosine Triphosphate Amino Acid Sequence Protein Binding |
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