A model of the transition state in the alkaline phosphatase reaction.
Holtz, K.M., Stec, B., Kantrowitz, E.R.(1999) J Biol Chem 274: 8351-8354
- PubMed: 10085061
- DOI: https://doi.org/10.1074/jbc.274.13.8351
- Primary Citation of Related Structures:
1B8J - PubMed Abstract:
A high resolution crystal structure of Escherichia coli alkaline phosphatase in the presence of vanadate has been refined to 1.9 A resolution. The vanadate ion takes on a trigonal bipyramidal geometry and is covalently bound by the active site serine nucleophile. A coordinated water molecule occupies the axial position opposite the serine nucleophile, whereas the equatorial oxygen atoms of the vanadate ion are stabilized by interactions with both Arg-166 and the zinc metal ions of the active site. This structural complex supports the in-line displacement mechanism of phosphomonoester hydrolysis by alkaline phosphatase and provides a model for the proposed transition state in the enzyme-catalyzed reaction.
Organizational Affiliation:
Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02167, USA.