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

Experimental Data Snapshot

  • Resolution: 1.87 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


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: https://doi.org/10.1021/acs.biochem.7b00638
  • Primary Citation of Related Structures:  
    5VR6, 5W5G, 5WDI

  • 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 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-1 HP ) and Sts-2 (Sts-2 HP ). We determined the X-ray crystal structures of unliganded Sts-1 HP and Sts-1 HP in complex with sulfate to 2.5 and 1.9 Å, respectively, and the structure of Sts-2 HP with sulfate to 2.4 Å. The steady-state kinetic analysis shows, as expected, that Sts-1 HP has a phosphatase activity significantly higher than that of Sts-2 HP and that the human and mouse proteins behave similarly. In addition, comparison of the phosphatase activity of full-length Sts-1 protein to Sts-1 HP reveals similar kinetics, indicating that Sts-1 HP 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 (K i = 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquitin-associated and SH3 domain-containing protein B
A, B
266Homo sapiensMutation(s): 0 
Gene Names: UBASH3BKIAA1959STS1
UniProt & NIH Common Fund Data Resources
Find proteins for Q8TF42 (Homo sapiens)
Explore Q8TF42 
Go to UniProtKB:  Q8TF42
GTEx:  ENSG00000154127 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8TF42
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth B],
M [auth B],
N [auth B],
O [auth B],
P [auth B],
Q [auth B],
R [auth B]
O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 1.87 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.64α = 90
b = 79.16β = 90
c = 105.102γ = 90
Software Package:
Software NamePurpose
d*TREKdata scaling
HKL-2000data scaling
PDB_EXTRACTdata extraction
d*TREKdata reduction
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesU01HL127522

Revision History  (Full details and data files)

  • Version 1.0: 2017-08-16
    Type: Initial release
  • Version 1.1: 2017-09-13
    Changes: Database references, Refinement description
  • Version 1.2: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Refinement description