2PK0

Structure of the S. agalactiae serine/threonine phosphatase at 2.65 resolution

Summary for 2PK0

• Entry DOI: 10.2210/pdb2pk0/pdb
• Descriptor: Serine/threonine protein phosphatase Stp1, MAGNESIUM ION, GLYCEROL, ... (5 entities in total)
• Functional Keywords: streptococcus agalactiae, serine, threonine, phosphatase, signaling motif, signaling protein
• Biological source: Streptococcus agalactiae
• Total number of polymer chains: 4
• Total formula weight: 109988.38

Authors

Rantanen, M.K.,Lehtio, L.,Rajagopal, L.,Rubens, C.E.,Goldman, A. (deposition date: 2007-04-17, release date: 2007-06-12, Last modification date: 2024-04-03)

Primary citation

Rantanen, M.K.,Lehtio, L.,Rajagopal, L.,Rubens, C.E.,Goldman, A.
Structure of Streptococcus agalactiae serine/threonine phosphatase. The subdomain conformation is coupled to the binding of a third metal ion
Febs J., 274:3128-3137, 2007

PubMed Abstract: 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.

PubMed: 17521332
DOI: 10.1111/j.1742-4658.2007.05845.x

Experimental method

X-RAY DIFFRACTION (2.65 Å)