6AM3

Regulator of G protein signaling (RGS) 17 in complex with Ca2+


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.53 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

High-resolution structure of RGS17 suggests a role for Ca2+in promoting the GTPase-activating protein activity by RZ subfamily members.

Sieng, M.Hayes, M.P.O'Brien, J.B.Andrew Fowler, C.Houtman, J.C.Roman, D.L.Lyon, A.M.

(2019) J.Biol.Chem. 294: 8148-8160

  • DOI: 10.1074/jbc.RA118.006059

  • PubMed Abstract: 
  • Regulator of G protein signaling (RGS) proteins are negative regulators of G protein-coupled receptor (GPCR) signaling through their ability to act as GTPase-activating proteins (GAPs) for activated Gα subunits. Members of the RZ subfamily of RGS pro ...

    Regulator of G protein signaling (RGS) proteins are negative regulators of G protein-coupled receptor (GPCR) signaling through their ability to act as GTPase-activating proteins (GAPs) for activated Gα subunits. Members of the RZ subfamily of RGS proteins bind to activated Gα o , Gα z , and Gα i1-3 proteins in the nervous system and thereby inhibit downstream pathways, including those involved in Ca 2+ -dependent signaling. In contrast to other RGS proteins, little is known about RZ subfamily structure and regulation. Herein, we present the 1.5-Å crystal structure of RGS17, the most complete and highest-resolution structure of an RZ subfamily member to date. RGS17 cocrystallized with Ca 2+ bound to conserved positions on the predicted Gα-binding surface of the protein. Using NMR chemical shift perturbations, we confirmed that Ca 2+ binds in solution to the same site. Furthermore, RGS17 had greater than 55-fold higher affinity for Ca 2+ than for Mg 2+ Finally, we found that Ca 2+ promotes interactions between RGS17 and activated Gα and decreases the K m for GTP hydrolysis, potentially by altering the binding mechanism between these proteins. Taken together, these findings suggest that Ca 2+ positively regulates RGS17, which may represent a general mechanism by which increased Ca 2+ concentration promotes the GAP activity of the RZ subfamily, leading to RZ-mediated inhibition of Ca 2+ signaling.


    Organizational Affiliation

    From the Departments of Chemistry and lyonam@purdue.edu.,the Department of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy.,Biological Sciences, Purdue University, West Lafayette, Indiana 47907 and.,From the Departments of Chemistry and.,NMR Facility, Roy J. and Lucille A. Carver College of Medicine, and.,Department of Microbiology and Immunology, University of Iowa, Iowa City, Iowa 52242.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Regulator of G-protein signaling 17
X, A
137Homo sapiensMutation(s): 0 
Gene Names: RGS17 (RGSZ2)
Find proteins for Q9UGC6 (Homo sapiens)
Go to Gene View: RGS17
Go to UniProtKB:  Q9UGC6
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, X
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
PG4
Query on PG4

Download SDF File 
Download CCD File 
A, X
TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
 Ligand Interaction
PGE
Query on PGE

Download SDF File 
Download CCD File 
X
TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.53 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.203 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 39.571α = 90.00
b = 59.295β = 100.60
c = 65.337γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
REFMACrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2017-08-09 
  • Released Date: 2019-02-13 
  • Deposition Author(s): Sieng, M., Lyon, A.M.

Revision History 

  • Version 1.0: 2019-02-13
    Type: Initial release
  • Version 1.1: 2019-08-28
    Type: Data collection, Database references