5VR6

Structure of Human Sts-1 histidine phosphatase domain with sulfate bound


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.87 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural and Functional Characterization of the Histidine Phosphatase Domains of Human Sts-1 and Sts-2.

Zhou, W.Yin, Y.Weinheimer, A.S.Kaur, N.Carpino, N.French, J.B.

(2017) Biochemistry 56: 4637-4645

  • DOI: 10.1021/acs.biochem.7b00638
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The suppressor of T cell signaling (Sts) proteins, Sts-1 and Sts-2, are homologous phosphatases that negatively regulate signaling pathways downstream of the T cell receptor. Functional inactivation of Sts-1 and Sts-2 in a murine model leads to resis ...

    The suppressor of T cell signaling (Sts) proteins, Sts-1 and Sts-2, are homologous phosphatases that negatively regulate signaling pathways downstream of the T cell receptor. Functional inactivation of Sts-1 and Sts-2 in a murine model leads to resistance to systemic infection by the opportunistic pathogen, Candida albicans. This suggests that modulation of the host immune response by inhibiting Sts function may be a viable strategy for treating these deadly fungal pathogen infections. To better understand the molecular determinants of function and structure, we characterized the structure and steady-state kinetics of the histidine phosphatase domains of human Sts-1 (Sts-1HP) and Sts-2 (Sts-2HP). We determined the X-ray crystal structures of unliganded Sts-1HP and Sts-1HP in complex with sulfate to 2.5 and 1.9 Å, respectively, and the structure of Sts-2HP with sulfate to 2.4 Å. The steady-state kinetic analysis shows, as expected, that Sts-1HP has a phosphatase activity significantly higher than that of Sts-2HP and that the human and mouse proteins behave similarly. In addition, comparison of the phosphatase activity of full-length Sts-1 protein to Sts-1HP reveals similar kinetics, indicating that Sts-1HP is a functional surrogate for the native protein. We also tested known phosphatase inhibitors and determined that the SHP-1 inhibitor, PHPS1, is a potent inhibitor of Sts-1 (Ki = 1.05 ± 0.15 μM). Finally, we demonstrated that human Sts-1 has robust phosphatase activity against the substrate, Zap-70, in a cell-based assay. Collectively, these data suggest that the human Sts proteins are druggable targets and provide a structural basis for future drug development efforts.


    Organizational Affiliation

    Department of Chemistry, Stony Brook University , Stony Brook, New York 11794, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ubiquitin-associated and SH3 domain-containing protein B
A, B
266Homo sapiensMutation(s): 0 
Gene Names: UBASH3B (KIAA1959, STS1)
EC: 3.1.3.48
Find proteins for Q8TF42 (Homo sapiens)
Go to Gene View: UBASH3B
Go to UniProtKB:  Q8TF42
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.87 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.194 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 62.640α = 90.00
b = 79.160β = 90.00
c = 105.102γ = 90.00
Software Package:
Software NamePurpose
d*TREKdata scaling
MOLREPphasing
REFMACrefinement
HKL-2000data scaling
d*TREKdata reduction
DENZOdata reduction
PDB_EXTRACTdata extraction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood InstituteUnited StatesU01HL127522

Revision History 

  • Version 1.0: 2017-08-16
    Type: Initial release
  • Version 1.1: 2017-09-13
    Type: Database references, Refinement description