2YJZ

Rat STEAP4 oxidoreductase domain complexed with NADP

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 

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Literature

The Crystal Structure of Six-Transmembrane Epithelial Antigen of the Prostate 4 (Steap4), a Ferri/Cuprireductase, Suggests a Novel Interdomain Flavin-Binding Site.

Gauss, G.H., Kleven, M.D., Sendamarai, A.K., Fleming, M.D., Lawrence, C.M.

(2013) J Biol Chem 288: 20668

  • DOI: 10.1074/jbc.M113.479154
  • Primary Citation of Related Structures:  
    2YJZ

  • PubMed Abstract: 

    • Steap4 is a cell surface metalloreductase linked to obesity-associated insulin resistance. Initial characterization of its cell surface metalloreductase activity has been reported, but thorough biochemical characterization of this activity is lacking. Here, we report detailed kinetic analysis of the Steap4 cell surface metalloreductase activities ...

    Steap4 is a cell surface metalloreductase linked to obesity-associated insulin resistance. Initial characterization of its cell surface metalloreductase activity has been reported, but thorough biochemical characterization of this activity is lacking. Here, we report detailed kinetic analysis of the Steap4 cell surface metalloreductase activities. Steap4 shows physiologically relevant Km values for both Fe(3+) and Cu(2+) and retains activity at acidic pH, suggesting it may also function within intracellular organelles to reduce these metals. Flavin-dependent NADPH oxidase activity that was much greater than the equivalent Steap3 construct was observed for the isolated N-terminal oxidoreductase domain. The crystal structure of the Steap4 oxidoreductase domain was determined, providing a structural explanation for these differing activities. Structure-function work also suggested Steap4 utilizes an interdomain flavin-binding site to shuttle electrons between the oxidoreductase and transmembrane domains, and it showed that the disordered N-terminal residues do not contribute to enzymatic activity.

    Organizational Affiliation: 

    Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
METALLOREDUCTASE STEAP4A, B, C, D201Rattus norvegicusMutation(s): 0 
Gene Names: Steap4
EC: 1.16.1 (PDB Primary Data), 1.16.1.9 (UniProt)
UniProt
Find proteins for Q4V8K1 (Rattus norvegicus)
Explore Q4V8K1 
Go to UniProtKB:  Q4V8K1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4V8K1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.228α = 90
b = 85.111β = 90
c = 128.035γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
MrBUMPphasing

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-05-30
    Type: Initial release
  • Version 1.1: 2013-07-31
    Changes: Database references