A large conformational change in the putative ATP pyrophosphatase PF0828 induced by ATP binding

作者：Forouhar Farhad; Saadat Nabila; Hussain Munif; Seetharaman Jayaraman; Lee Insun; Janjua Haleema; Xiao Rong; Shastry Ritu; Acton Thomas B; Montelione Gaetano T; Tong Liang

来源：Acta Crystallographica Section F-Structural Biology and Crystallization Communications, 2011, 67: 1323-1327.

DOI：10.1107/S1744309111031447

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 beta-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.

• 出版日期2011-11
• 单位rutgers