Crystal Structure of Inactive Serum and Glucocorticoid- Regulated Kinase 1 in Complex with AMP-PNP

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

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Crystal structure of the kinase domain of serum and glucocorticoid-regulated kinase 1 in complex with AMP PNP.

Zhao, B.Lehr, R.Smallwood, A.M.Ho, T.F.Maley, K.Randall, T.Head, M.S.Koretke, K.K.Schnackenberg, C.G.

(2007) Protein Sci 16: 2761-2769

  • DOI: https://doi.org/10.1110/ps.073161707
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Serum and glucocorticoid-regulated kinase 1 (SGK1) is a serine/threonine protein kinase of the AGC family which participates in the control of epithelial ion transport and is implicated in proliferation and apoptosis. We report here the 1.9 A crystal structure of the catalytic domain of inactive human SGK1 in complex with AMP-PNP. SGK1 exists as a dimer formed by two intermolecular disulfide bonds between Cys258 in the activation loop and Cys193. Although most of the SGK1 structure closely resembles the common protein kinase fold, the structure around the active site is unique when compared to most protein kinases. The alphaC helix is not present in this inactive form of SGK1 crystal structure; instead, the segment corresponding to the C helix forms a beta-strand that is stabilized by the N-terminal segment of the activation loop through a short antiparallel beta-sheet. Since the differences from other kinases occur around the ATP binding site, this structure can provide valuable insight into the design of selective and highly potent ATP-competitive inhibitors of SGK1 kinase.

  • Organizational Affiliation

    Department of Computational and Structural Chemistry, GlaxoSmithKline, King of Prussia, Pennsylvania 19406, USA. baoguang.zhao@gsk.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase Sgk1373Homo sapiensMutation(s): 4 
Gene Names: SGKSGK1
UniProt & NIH Common Fund Data Resources
Find proteins for O00141 (Homo sapiens)
Explore O00141 
Go to UniProtKB:  O00141
GTEx:  ENSG00000118515 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00141
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.873α = 90
b = 97.873β = 90
c = 147.848γ = 120
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description
  • Version 1.3: 2019-07-24
    Changes: Data collection, Derived calculations, Refinement description
  • Version 1.4: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.5: 2024-02-21
    Changes: Data collection