5W5G

Structure of Human Sts-1 histidine phosphatase domain

  • Classification: HYDROLASE
  • Organism(s): Homo sapiens
  • Expression System: Escherichia coli

  • Deposited: 2017-06-15 Released: 2017-08-16 
  • Deposition Author(s): Zhou, W., Yin, Y., Weinheimer, A.W., Kaur, N., Carpino, N., French, J.B.
  • Funding Organization(s): Department of Defense (United States); National Institutes of Health/National Heart, Lung, and Blood Institute; National Institutes of Health/National Institute of General Medical Sciences; National Institutes of Health/National Center for Research Resources; National Institutes of Health/Office of the Director 

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.48 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.2 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, C
262Homo 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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.48 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.194 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 116.602α = 90.00
b = 74.498β = 100.88
c = 101.720γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Department of Defense (United States)United StatesW81XWH17-1-0147
National Institutes of Health/National Heart, Lung, and Blood InstituteUnited StatesU01HL127522
National Institutes of Health/National Institute of General Medical SciencesUnited StatesP41 GM103403
National Institutes of Health/National Center for Research ResourcesUnited StatesS10 RR029205
National Institutes of Health/Office of the DirectorUnited StatesS10OD021527

Revision History 

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