The first crystal structure of the novel class of fructose-1,6-bisphosphatase present in thermophilic archaea.
As the first structure of the novel class of fructose-1,6-bisphosphatase (FBPase) present in thermophilic archaea, we solved the crystal structure of the ST0318 gene product (St-Fbp) of Sulfolobus tokodaii strain 7. The St-Fbp structure comprises a homooctamer of the 422 point-group. The protein folds as a four-layer alpha-beta-beta-alpha sandwich with a novel topology, which is completely different from the sugar phosphatase fold. The structure contains an unhydrolyzed FBP molecule in the open-keto form, as well as four hexacoordinated magnesium ions around the 1-phosphoryl group of FBP. The arrangement of the catalytic side chains and metal ligands is consistent with the three-metal ion assisted catalysis proposed for conventional FBPases. The structure provides an insight into the structural basis of the strict substrate specificity of St-Fbp.
Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
Hiroshi
H
Nishimasu
Shinya
S
Fushinobu
Hirofumi
H
Shoun
Takayoshi
T
Wakagi
D000595:Amino Acid Sequence; D001105:Archaea / Q000201:enzymology*; D001665:Binding Sites; D002384:Catalysis; D020134:Catalytic Domain; D018360:Crystallography, X-Ray; D004305:Dose-Response Relationship, Drug; D004583:Electrons; D004926:Escherichia coli / Q000378:metabolism; D006597:Fructose-Bisphosphatase / Q000737:chemistry*; D007477:Ions; D007700:Kinetics; D008024:Ligands; D008094:Lithium / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009154:Mutation; D011487:Protein Conformation; D017510:Protein Folding; D017433:Protein Structure, Secondary; D011994:Recombinant Proteins / Q000737:chemistry; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D013696:Temperature
D007477:Ions; D008024:Ligands; D011994:Recombinant Proteins; D008094:Lithium; D006597:Fructose-Bisphosphatase; D008274:Magnesium