We report the 1.8 A crystal structure of adenosine triphosphate (ATP)-magnesium-oxalate bound phosphoenolpyruvate carboxykinase (PCK) from Escherichia coli. ATP binding induces a 20 degree hinge-like rotation of the N- and C-terminal domains which closes the active-site cleft ...
We report the 1.8 A crystal structure of adenosine triphosphate (ATP)-magnesium-oxalate bound phosphoenolpyruvate carboxykinase (PCK) from Escherichia coli. ATP binding induces a 20 degree hinge-like rotation of the N- and C-terminal domains which closes the active-site cleft. PCK possesses a novel nucleotide-binding fold, particularly in the adenine-binding region, where the formation of a cis backbone torsion angle in a loop glycine residue promotes intimate contacts between the adenine-binding loop and adenine, while stabilizing a syn conformation of the base. This complex represents a reaction intermediate analogue along the pathway of the conversion of oxaloacetate to phosphoenolpyruvate, and provides insight into the mechanistic details of the chemical reaction catalysed by this enzyme.
Related Citations:
Allosteric Control by Calcium and Mechanism of Desensitization of Phosphoenolpyruvate Carboxykinase of Escherichia Coli Goldie, H., Sanwal, B.D. () To be published --: --
Crystal Structure of Escherichia Coli Phosphoenolpyruvate Carboxykinase: A New Structural Family with the P-Loop Nucleoside Triphosphate Hydrolase Fold Matte, A., Goldie, H., Sweet, R.M., Delbaere, L.T. (1996) J Mol Biol 256: 126
Crystallization of the Calcium-Activated Phosphoenolpyruvate Carboxykinase from Escherichia Coli K12 Delbaere, L.T., Vandonselaar, M., Glaeske, D., Jabs, C., Goldie, H. (1991) J Mol Biol 219: 593
Sequence of the Pcka Gene of Escherichia Coli K-12: Relevance to Genetic and Allosteric Regulation and Homology of E. Coli Phosphoenolpyruvate Carboxykinase with the Enzymes from Trypanosoma Brucei and Saccharomyces Cerevisiae Medina, V., Pontarollo, R., Glaeske, D., Tabel, H., Goldie, H. (1990) J Bacteriol 172: 7151
Organizational Affiliation:
Department of Biochemistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
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