2pk0
From Proteopedia
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| , resolution 2.65Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , and | ||||||
| Gene: | stp (Streptococcus agalactiae) | ||||||
| Activity: | Phosphoprotein phosphatase, with EC number 3.1.3.16 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Structure of the S. agalactiae serine/threonine phosphatase at 2.65 resolution
Overview
We solved the crystal structure of Streptococcus agalactiae serine/threonine phosphatase (SaSTP) using a combination of single-wavelength anomalous dispersion phasing and molecular replacement. The overall structure resembles that of previously characterized members of the PPM/PP2C STP family. The asymmetric unit contains four monomers and we observed two novel conformations for the flap domain among them. In one of these conformations, the enzyme binds three metal ions, whereas in the other it binds only two. The three-metal ion structure also has the active site arginine in a novel conformation. The switch between the two- and three-metal ion structures appears to be binding of another monomer to the active site of STP, which promotes binding of the third metal ion. This interaction may mimic the binding of a product complex, especially since the motif binding to the active site contains a serine residue aligning remarkably well with the phosphate found in the human STP structure.
About this Structure
2PK0 is a Single protein structure of sequence from Streptococcus agalactiae. Full crystallographic information is available from OCA.
Reference
Structure of Streptococcus agalactiae serine/threonine phosphatase. The subdomain conformation is coupled to the binding of a third metal ion., Rantanen MK, Lehtio L, Rajagopal L, Rubens CE, Goldman A, FEBS J. 2007 Jun;274(12):3128-37. Epub 2007 May 22. PMID:17521332
Page seeded by OCA on Thu Mar 20 18:13:57 2008
