Primary Citation of Related Structures: 1KBL, 1KC7
PubMed Abstract:
Crystals of pyruvate phosphate dikinase in complex with a substrate analogue inhibitor, phosphonopyruvate (K(i) = 3 microM), have been obtained in the presence of Mg(2+). The structure has been determined and refined at 2.2 A resolution, revealing that the Mg(2+)-bound phosphonopyruvate binds in the alpha/beta-barrel's central channel, at the C-termini of the beta-strands ...
Crystals of pyruvate phosphate dikinase in complex with a substrate analogue inhibitor, phosphonopyruvate (K(i) = 3 microM), have been obtained in the presence of Mg(2+). The structure has been determined and refined at 2.2 A resolution, revealing that the Mg(2+)-bound phosphonopyruvate binds in the alpha/beta-barrel's central channel, at the C-termini of the beta-strands. The mode of binding resembles closely the previously proposed PEP substrate binding mode, inferred by the homology of the structure (but not sequence homology) to pyruvate kinase. Kinetic analysis of site-directed mutants, probing residues involved in inhibitor binding, showed that all mutations resulted in inactivation, confirming the key role that these residues play in catalysis. Comparison between the structure of the PPDK-phosphonopyruvate complex and the structures of two complexes of pyruvate kinase, one with Mg(2+)-bound phospholactate and the other with Mg(2+)-oxalate and ATP, revealed that the two enzymes share some key features that facilitate common modes of substrate binding. There are also important structural differences; most notably, the machinery for acid/base catalysis is different.
Related Citations:
SWIVELING-DOMAIN MECHANISM FOR ENZYMATIC PHOSPHOTRANSFER BETWEEN REMOTE REACTION SITES Herzberg, O., Chen, C.C.H., Kapadia, G., Mcguire, M., Carroll, L.J., Noh, S.J., Dunaway-Mariano, D. (1996) Proc Natl Acad Sci U S A 93: 2652
Location of the Phosphate Binding Site within Clostridium Symbiosum Pyruvate Phosphate dikinase Mcguire, M., Huang, K., Kapadia, G., Herzberg, O., Dunaway-Mariano, D. (1998) Biochemistry 37: 13463
Identification of Domain-Domain Docking Sites within Clostridium Symbiosum Pyruvate Phosphate Dikinase by Amino Acid Replacement Wei, M., Li, Z., Ye, D., Herzberg, O., Dunaway-Mariano, D. (2000) J Biol Chem 275: 41156
Organizational Affiliation:
Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, 9600 Gudelsky Drive, Rockville, Maryland 20850, USA. osnat@carb.nist.gov
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