Structure of EstA esterase from psychrotrophic Pseudoalteromonas sp. 643A covalently inhibited by monoethylphosphonate.
Brzuszkiewicz, A., Nowak, E., Dauter, Z., Dauter, M., Cieslinski, H., Dlugolecka, A., Kur, J.(2009) Acta Crystallogr Sect F Struct Biol Cryst Commun 65: 862-865
- PubMed: 19724118 
- DOI: https://doi.org/10.1107/S1744309109030826
- Primary Citation of Related Structures:  
3HP4 - PubMed Abstract: 
The crystal structure of the esterase EstA from the cold-adapted bacterium Pseudoalteromonas sp. 643A was determined in a covalently inhibited form at a resolution of 1.35 A. The enzyme has a typical SGNH hydrolase structure consisting of a single domain containing a five-stranded beta-sheet, with three helices at the convex side and two helices at the concave side of the sheet, and is ornamented with a couple of very short helices at the domain edges. The active site is located in a groove and contains the classic catalytic triad of Ser, His and Asp. In the structure of the crystal soaked in diethyl p-nitrophenyl phosphate (DNP), the catalytic serine is covalently connected to a phosphonate moiety that clearly has only one ethyl group. This is the only example in the Protein Data Bank of a DNP-inhibited enzyme with covalently bound monoethylphosphate.
Organizational Affiliation: 
Synchrotron Radiation Research Section, MCL, National Cancer Institute, Argonne National Laboratory, Argonne, IL 60439, USA.