AI Article Synopsis
- Solved the crystal structure of Streptococcus agalactiae serine/threonine phosphatase (SaSTP) using advanced techniques, revealing similarities to other known STP family members.
- Identified two novel conformations of the flap domain in the enzyme, with one form binding three metal ions and the other binding two.
- The interaction that facilitates the switch between metal ion structures might simulate a product complex, as a key serine residue aligns with phosphate in a related human STP structure.
Article 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2361094 | PMC |
| http://dx.doi.org/10.1111/j.1742-4658.2007.05845.x | DOI Listing |
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